PUBLIC REVIEW DRAFT DRAFT UGANDA STANDARD  
  DUS 310-2 
Second  Edition  
2016 -09-01 
 
 
 Reference number  
DUS 310-2: 2016 
© UNBS 2016   
  
Cement — Part 2: Conformity evaluation 
 
 PUBLIC REVIEW DRAFTDUS 310-2: 2016 
ii © UNBS 2016  – All rights reserv ed 
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2015   
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from UNBS. 
Requests for permission to reproduce this document should be addressed to 
The Executive Director 
Uganda National Bureau of Standards 
P.O. Box 6329 
Kampala 
Uganda 
Tel: 256 414 505 995 
Fax: 256 414 286 123 
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  PUBLIC REVIEW DRAFTDUS 310-2: 2016  
© UNBS 2016  – All rights reserved  iii 
 Contents Page 
Foreword ............................................................................................................................................................. v  
1 Scope ...................................................................................................................................................... 1  
2 Normative references ............................................................................................................................ 1  
3 Terms and definitions ........................................................................................................................... 2  
4 Requirements for factory production control by the manufacturer ................................................. 3  
4.1 General requirements ........................................................................................................................... 3  
4.1.1  Concept  ................................ ................................ ................................................................ .................. 3 
4.1.2  Works' quality manual  ................................................................ ................................ .......................... 3 
4.1.3  Management systems  ................................................................ ................................ ........................... 4 
4.1.4  System of documentation  ................................ ................................................................ .................... 4 
4.2 Internal quality control .......................................................................................................................... 5  
4.2.1  Process control  ................................ ................................ ................................ ..................................... 5 
4.2.2  Measuring and testing  ................................................................ ................................ .......................... 5 
4.2.3  Handling, storage, packaging and delivery  ................................ ................................ ........................ 5 
4.3 Autocontrol testing of samples ........................................................................................................... 5  
4.3.1  Sampling and testing  ................................................................ ................................ ............................ 5 
4.3.2  Corrective action  ................................................................ ................................ ................................... 6 
4.3.3  Measuring and test equipment for a utocontrol testing  ................................ ..................................... 6 
4.3.4  Quality records  ................................ ................................ ................................ ...................................... 6 
5 Tasks for the product certification body ............................................................................................. 6  
5.1 General ................................................................................................................................................... 6  
5.2 Continuous surveillance, assessment and evaluation of the factory production control ............ 6  
5.2.1  Inspection tasks  ................................ ................................ ................................ .................................... 6 
5.2.2  Frequency of inspections  ................................ ................................................................ ..................... 7 
5.2.3  Reports  ................................ ................................ ................................................................ ................... 7 
5.3 Evaluation of the results of autocontrol testing of samples ............................................................. 7  
5.3.1  Evaluation tasks  ................................ ................................ ................................ .................................... 7 
5.3.2  Number and timing of evaluations  ................................ ................................ ...................................... 7 
5.3.3  Control period  ................................ ................................ ................................................................ ........ 7 
5.3.4  Evaluation of test results  ................................................................ ................................ ...................... 7 
5.3.5  Reports  ................................ ................................ ................................................................ ................... 8 
5.4 Audit testing of samples taken at the factory/depot and determination of product-type by 
testing ..................................................................................................................................................... 8  
5.4.1  Sampling  ................................ ................................ ................................................................ ................ 8 
5.4.2  Number of samples  ................................................................ ................................ ............................... 8 
5.4.3  Properties and test methods  ................................ ................................................................ ................ 8 
5.4.4  Testing  ................................ ................................ ................................................................ .................... 8 
5.4.5  Evaluation of test results  ................................................................ ................................ ...................... 8 
5.4.6  Reports  ................................ ................................ ................................................................ ................... 9 
5.4.7  Proficiency testing  ................................................................ ................................ ................................ 9 
5.5 Initial inspection of the factory and the factory production control ................................................ 9  
5.5.1 Inspection of a new factory  ................................ ................................................................ .................. 9 
5.5.2  Inspection of an existing factory  ................................ ................................................................ ......... 9 
5.5.3  Criteria for the assessment of the production eq uipment  ................................ ................................ 9 
5.5.4  Criteria for the assessment of laboratories  ................................ ................................ ...................... 10 
5.5.5  Reports  ................................ ................................ ................................................................ ................. 10 
5.6 Evaluation of test results during the initial period .......................................................................... 10 
5.6.1  Initial period  ................................ ................................ ................................................................ ......... 10 
5.6.2  Evaluation of test res ults ................................ ................................ ................................ .................... 10 
5.6.3  Reports  ................................ ................................ ................................................................ ................. 10 PUBLIC REVIEW DRAFTDUS 310-2: 2016 
iv © UNBS 2016  – All rights reserv ed 
 6 Actions in the event of non-conformity ............................................................................................  10 
6.1 Actions to be taken by the manufacturer .........................................................................................  10 
6.2 Actions to be taken by the product certification body ................................................................... 11 
6.2.1  Following  continuous surveillance, assessment and evaluation of the factory production 
control (see 5.2) and evaluation of the results of autocontrol testing (see 5.3)  ..........................  11 
6.2.2  Following evaluation of the results of the audit testing of samples taken at the 
factory/depot (see 5.4 and Annex A) ................................ ................................................................ . 11 
7 Procedure for third party certification of conformity of performance of the product ................. 11 
8 Certificate of constancy of performance of the product and conformity mark  ...........................  12 
8.1 indication of constancy of performance of the produ ct ................................................................ . 12 
8.2 Certificate of constancy of performance of the product  ................................................................  12 
8.3 Conformity mark ................................................................................................................................ . 12 
9 Requirements for dispatching centres .............................................................................................  13 
9.1 General requirements .........................................................................................................................  13 
9.2 Tasks for the intermediary ................................................................................................................. 13 
9.2.1  Measures to maintain the cement quality  ................................ ................................ ........................ 13 
9.2.2  Confirmation autocontrol testing of samples taken at the dispatching c entre  ...........................  13 
9.3 Tasks for the third party ..................................................................................................................... 14 
9.3.1  Continuous surveillance, assessment and evaluation of the measures to maintain t he 
cement quality and of the confirmation autocontrol  ................................ ................................ ....... 14 
9.3.2  Audit testing of samples taken at the dispatching centre  ..............................................................  14 
9.3.3  Decisions to be taken  ................................ ................................ .........................................................  14 
Annex A (normative)  Evaluation of the representativeness and the accuracy of the 28 day 
strength test results ...........................................................................................................................  16 
A.1 General ................................................................................................................................................. 16 
A.2 Sets of results considered ................................................................................................................. 16 
A.3 Evaluation procedure  ................................ ................................ .........................................................  16 
A.3.1  Introduction  ................................ ................................ ................................ ................................ ......... 16 
A.3.2  Symbols ............................................................................................................................................... 16 
A.3.3  Evaluation of whether set A and set B belong to the same p opulation (sampling error 
check)  ................................ ................................................................ ................................ ................... 17 
A.3.4  Comparison between set B and set C in order to check the accuracy of the autocontrol 
testing (testing error check)  ................................................................ ................................ .............. 17 
A.3.5  Masonry cement ................................ ................................ ................................................................ .. 18 
A.3.6  Calcium aluminate cement ................................................................................................................ 19 
Annex B (informative)  Procedure for certification of constancy of performance of cement ................. 20 
Bibliography ..................................................................................................................................................... 21 
 PUBLIC REVIEW DRAFTDUS 310-2: 2016  
© UNBS 2016  – All rights reserved  v 
 Foreword 
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade, Industry and 
Cooperatives established under Cap 327, of the Laws of Uganda, as amended.  UNBS is mandated to co-
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT Agreement of the World Trade Organisation (WTO). 
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of representatives of 
consumers, traders, academicians, manufacturers, government and other stakeholders. 
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council. 
DUS  310-2 was prepared by Technical Committee TC3, Cement, lime, clay and related products . 
In the preparation of this Uganda Standard, reference was made to the following standard: 
EN 197-2: 2014; Cement – Part 2; Conformity evaluation 
The assistance derived from the above source is hereby acknowledged with thanks. 
This second edition cancels and replaces the first edition ( US 310-2:2000 ), which has been technically revised. 
DUS  310 consists of the following parts, under the general title: Cement.  
Part 1: Composition, specification and conformity criteria for common cement  
Part 2: Conformity evaluation  
 PUBLIC REVIEW DRAFTDUS 310-2: 2016 
vi © UNBS 2016  – All rights reserv ed 
  PUBLIC REVIEW DRAFTDRAFT UGANDA STANDARD  DUS 310-2: 2016  
 
© UNBS 2016  – All rights reserved  1 
 Cement — Part 2: Conformity evaluation 
1 Scope 
This Draft Uganda Standard specifies the scheme for the assessment and verification of constancy of 
performance (AVCP) of cements to their corresponding product specification standards, including certification 
of constancy of performance by a product certification body.  
This standard provides technical rules for factory production control by the manufacturer, including autocontrol 
testing of samples, and for the tasks of the product certification body. It also provides rules for actions to be 
followed in the event of non-conformity, the procedure for the AVCP and requirements for dispatching centres.  
NOTE 1 In this standard the word "cement" is used to refer both to common cements as defined in DUS  310- 1 
and to other cements and binders for which the relevant product specification standard makes reference to 
this Uganda standard and which are sub mitted for certification. Such cement is produced at a given factory 
and belongs to a particular type and a particular strength class, as defined and specified in the relevant 
product specification standard.  
NOTE 2 This standard should be linked with other standards covering cements and binders, in particular for 
the assignments of tasks of the manufacturer and the product certification body. 
2 Normative references 
The following referenced documents are indispensable for the application of this document. For dated 
references, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies. 
ASTM C 91  Specification for Masonry Cement  
EN 14647, Calcium aluminate cement. Composition, specifications and conformity criteria 
DUS  310-1, Cement — Part 1: Composition, specifications and conformity criteria for common cements  
DUS  100-1,  Cement — Test methods — Part 1: Determination of strength  
DUS  100-2, Cement-Test methods — Part 2: Chemical analysis of cement  
DUS  100-3, Cement-Test methods — Part 3: Determination of setting time and soundness  
DUS  100-5, Cement-Test methods — Part 5: pozzolanity test for pozzolanic cements  
DUS  100-7,  Cement — Test methods — Part 7: Methods of taking and preparing samples of cement  
ISO 2854, Statistical interpretation of data — Techniques of estimation and tests relating to means and 
variances  
ISO/IEC 17020 , Conformity assessment — Requirements for the operation of various types of bodies 
performing inspection  PUBLIC REVIEW DRAFTDUS 310-2: 2016 
2 © UNBS 2016  – All rights reserved  
 ISO 170 25, General requirements for the competence of testing and calibration laboratories 
ISO/IEC 17043 , Conformity assessment — General requirements for proficiency testing  
ISO/IEC 17065 , Conformity assessment — Requirements for bodies certifying products, proc esses and 
services  
3 Terms and definitions 
For the purposes of this standard, the following terms and definitions shall apply.  
3.1 
AVCP 
assessment and verification of consistency of performance 
3.2 
certificate of constancy of performance of product 
document issued under the rules of this scheme for the AVCP indicating that adequate confidence is provided 
that cement is in conformity with the relevant product specification standard  
3.3 
conformity mark  
protected mark applied on the basis of the certificate of conformity  
3.4 
certified cement  
cement for which a certificate of conformity has been issued  
3.5 
initial period 
immediate period after the first issuing of the certificate of conformity for a cement  
3.6 
certification body  
impartial body, governmental or non-governmental, possessing the necessary competence and responsibility 
to carry out conformity certification according to given rules of procedure and management 
3.7 
factory production control  
permanent internal control of cement production exercised by the manufacturer consisting of internal quality 
control complemented by autocontrol testing  
3.8 
factory  
facility used by a manufacturer for the production of cement using equipment which is suitable for continuous 
mass production of cement including, in particular, equipment for adequate grinding and homogenization and 
the necessary silo capacity for the storage and dispatch of each cement produced. This equipment and the 
production control applied allow the control of production with sufficient accuracy to ensure that the 
requirements of the relevant product specification standard are met  
3.9 
new factory  
factory which is not already producing cement(s) certified under this scheme 
3.10 
existing factory  
factory which is already producing cement(s) certified under this scheme  PUBLIC REVIEW DRAFTDUS 310-2: 2016 
© UNBS 2016  – All rights reserved  3 
 3.11  
depot  
bulk cement handling facility (not located at the factory) used for the dispatch of cement (whether in bulk or 
bagged) after transfer or storage, where the manufacturer has full responsibility for all aspects of the quality of 
the cement 
3.12 
dispatching centre  
bulk cement handling facility (not located at the factory) used for the dispatch of cement after transfer or 
storage, where an intermediary has full responsibility for all aspects of the quality of the ceme nt 
3.13 
intermediary  
natural or legal person, who takes from the manufacturer bulk cement certified according to DUS 310-2 and 
bearing the conformity mark, who undertakes full responsibility for maintaining in a bulk handling facility all 
aspects of the quality of the cement and, who supplies the cement onwards to a further person  
3.14 
confirmation autocontrol testing  
continual testing carried out by an intermediary, which consists of testing of samples taken by the intermediary 
at the point(s) of release from the dispatching centre  
3.15 
works' quality manual  
document that provides information on the factory production control which is applied by a manufacturer at a 
particular factory to ensure conformity of the cement with the requirements of the relevant product 
specification standard. 
4 Requirements for factory production control by the manufacturer 
4.1 General requirements 
4.1.1  Concept 
Factory production control means the permanent internal control of cement production exercised by the 
manufacturer and consists of internal quality control (see 4.2) complemented by autocontrol testing of 
samples of cement taken at the point of release (see 4.3).  
NOTE The requirements of this standard as regards factory production control take account of those clauses of ISO 
9001 which are relevant to the production, process control and testing of cement.  
4.1.2  Works' quality manual  
4.1.2.1 The manufacturer's documentation and procedures for  factory production control shall be 
described in a Works' quality manual, which shall adequately describe, among other things:  
a) the quality aims and the organizational structure, responsibilities and powers of the management with 
regard to product quality and the means to monitor the achievement of the required product quality 
and the effective operation of the internal quality control (see 4.1.3);  
b) the manufacturing and quality control techniques, processes and systematic actions that shall be used 
(see 4.2.1, 4.2.3 and 4.3.2); and 
c) the inspections and tests that shall be carried out before, during and after manufacture, and the 
frequency with which they shall be carried out (see 4.2.2, 4.3.1 and 4.3.3).  PUBLIC REVIEW DRAFTDUS 310-2: 2016 
4 © UNBS 2016  – All rights reserved  
 4.1.2.2 The works' quality manual prepared by the manufacturer for each factory shall include an 
adequate system of documentation  (see 4.1.4 and 4.3.4).  
4.1.2.3 The Works' quality manual shall address and document the procedures operated to ensure that 
the manufactured cement conforms to the technical specifications. The manual may reference associated 
documents which provide further details of the autocontrol testing of samples and the internal quality control.  
4.1.2.4 For the purpose of this scheme, the term Works' quality manual shall be considered to include 
these associated documents.  
4.1.2.5 In the case of an existing quality management system according to ISO 9001, the product 
certification body may examine if the corresponding quality manual meets all the requirements of this standard 
which are relevant to the factory production control of cement. Provided all the requirements are included, this 
quality manual may also be applied for product certification.  
4.1.3  Management systems  
4.1.3.1 Quality policy statement  
The Works' quality manual shall include a statement by management defining its quality policy, objectives and 
commitments to the attainment of product quality.  
4.1.3.2 Management representative  
The manufacturer shall appoint a management representative who, irrespective of other responsibilities, shall 
have defined authority and responsibility for ensuring that the requirements of this standard for the AVCP are 
implemented and maintained.  
4.1.3.2 Internal audits and management review  
In order to ensure the continuing suitability and effectiveness of the Work's quality manual to meet the 
requirements of this standard, the manufacturer shall perform at least once per year:  
a) internal audits covering the scope of this Clause 4 and 6.1  
b) a management review of the functioning and result of the factory production control, taking into 
account records of the internal audits.  
4.1.3.3 Training 
The Works' quality manual shall describe the measures taken to ensure that all the personnel involved in 
operations that can affect internal quality control and product quality have appropriate experience or training. 
Appropriate records shall be retained.  
4.1.4  System of documentation 
4.1.4.1 Document control 
4.1.4.1.1 The management representative shall be responsible for the control of all documents and data 
related to factory production control and to this scheme for the AVCP.  
4.1.4.1.2 The control shall ensure that the appropriate issues of all documents are available at essential 
locations that obsolete documents are withdrawn and that changes or modifications to any document are 
effectively introduced.  
4.1.4.1.3 The manufacturer shall have a system to identify the current version of documents in order to 
prevent the use of non-applicable documents PUBLIC REVIEW DRAFTDUS 310-2: 2016 
© UNBS 2016  – All rights reserved  5 
 4.1.4.2 Quality records  
The manufacturer shall retain records to provide evidence of factory production control for at least the period 
required to comply with relevant legislatio n. 
4.2 Internal quality control 
4.2.1  Process control 
4.2.1.1 General  
The Works' quality manual shall describe the parameters for process planning, process control and testing, 
inspection, corrective action, verification, dispatch and the associated records.  
4.2.1.2 Constituents and composition of cement  
The manufacturer shall establish documented procedures and appropriate test methods to ensure that the 
constituents meet the requirements of the relevant product specification standard and are suitable to enable 
cement to be produced meeting the technical specification.  
The Works' quality manual shall describe the methods used by the manufacturer to ensure that the 
composition of the cement produced conforms to the relevant product specification standard, including 
appropriate test methods.  
4.2.1.3  Control of off-specification production  
The Works' quality manual shall contain procedures to ensure that off-specification production is adequately 
managed.  
4.2.2  Measuring and testing  
4.2.2.1 Inspection, measuring and test equipment  
The equipment for in-process inspection and testing shall be regularly checked and calibrated in accordance 
with the procedures and frequencies laid down in the Works' quality manual.  
4.2.2.2 Inspection and test status  
Procedures for the inspection and test status through the stages of manufacture shall be detailed in the 
Works' quality manual. These shall include procedures for the control of off-specification intermediate 
materials.  
4.2.3  Handling, storage, packaging and delivery  
The Works' quality manual shall describe the precautions taken for the protection of the quality of the cement 
while under the responsibility of the manufacturer. It shall include a description of the procedures used at 
depots. Delivery documentation shall allow traceability to the producing works.  
4.3 Autocontrol testing of samples  
4.3.1  Sampling and testing  
4.3.1.1 The manufacturer shall operate a system of autocontrol testing for each certified cement. This 
system shall be used to demonstrate conformity to the requirements in the relevant clause concerning AVCP 
in the relevant product specification standard. The properties to be tested, the testing methods, the minimum 
frequency of autocontrol testing during routine testing and initial period testing and the conformity criteria shall PUBLIC REVIEW DRAFTDUS 310-2: 2016 
6 © UNBS 2016  – All rights reserved  
 be in accordance with the basic requirements given in the relevant clause concerning AVCP  in the relevant 
product specification standard. For cements not being dispatched continuously, the frequency of testing and 
the point of sampling shall be as specified in the Works' quality manual.  
4.3.1.2 All test data shall be documented.  
4.3.2  Corrective action  
4.3.2.1 The Works' quality manual shall document procedures for the review and adjustment of the 
factory production control in case of non-conformity (see 6.1).  
4.3.2.2 The actions taken in the event of non -conformity shall be recorded in a report subject to 
inspection during the management review.  
4.3.2.3 In the e vent of cement yielding a test result not conforming to the single result limit value 
conformity criteria specified in the relevant product specification standard, the manufacturer shall immediately 
determine the affected quantity, take appropriate action to prevent the dispatch of this quantity and inform the 
affected customer if such cement has been released. In addition, the manufacturer shall immediately 
determine the causes of such non -conformity, take corrective actions and undertake a review of all r elevant 
factory production control procedures. All such actions and findings shall be appropriately recorded in a report 
subject to inspection during the management review.  
4.3.2.4 The product certification body may require to be kept informed of these ac tions and findings.  
4.3.3  Measuring and test equipment for autocontrol testing  
The equipment used for autocontrol testing shall be regularly checked and calibrated in accordance with 
procedures and frequencies laid down in the Works' quality manual. These procedures may include 
comparison of compressive strength test results by proficiency testing according to ISO/IEC 17043.  
The Works' quality manual shall document procedures to ensure that all personnel involved in autocontrol 
testing have appropriate experience and training. Appropriate records shall be retained.  
4.3.4  Quality records  
The manufacturer shall retain records of the autocontrol test results and appropriate records on test 
equipment for at least the period required to comply with relevant legislation.  
5 Tasks for the product certification body  
5.1 General 
The product certification body (see 3.6) has responsibility for the certification of constancy of performance of 
the product. 
The product certification body should comply with those clauses of ISO/IEC 17065, ISO/IEC 17020 and 
ISO/IEC 17025 which are relevant to this standard. 
5.2 Continuous surveillance, assessment and evaluation of the factory production control  
5.2.1  Inspection tasks  
5.2.1.1 The inspection tasks include continuous surveillance, assessment and evaluation of the factory 
production control operated by the manufacturer. Inspection shall include checking that any major change in 
the Works' quality manual which is relevant to the factory production control of cement has been reported to 
the product certification body by the manufacturer within one month of its implementation.  PUBLIC REVIEW DRAFTDUS 310-2: 2016 
© UNBS 2016  – All rights reserved  7 
 5.2.1.2 Inspection shall verify that the factory production control complies with the requirements of clause 
4 and has been carried out according to the Works' quality manual.  
5.2.2  Frequency of inspections  
The inspections shall normally be carried out at least once per year and the product certification body shall 
inform the manufacturer in advance when an inspection is to be made.  
5.2.3  Reports 
5.2.3.1 Following each inspection, a confidential report shall be prepared and sent to the manufacturer by 
the product certification body.  
5.2.3.2 The manufacturer shall, if appropriate, advise the product certification body of any corrective 
actions taken or  planned to be taken following receipt of the report.  
5.2.3.3 The product certification body shall then make a decision on its final assessment.  
5.3 Evaluation of the results of autocontrol testing of samples  
5.3.1  Evaluation tasks  
Continuous surveillance, assessment and evaluation of the factory production control includes evaluation of 
the test results of the manufacturer's autocontrol testing to check conformity to the statistical conformity 
criteria and single result limit values in the relevant product specification standard.  
5.3.2  Number and timing of evaluations  
The number of evaluations of the results of autocontrol testing of samples shall be at least two per year. The 
timing of the evaluations should be decided in advance.  
5.3.3  Control peri od  
The length of the control period for evaluation of the autocontrol test results shall be as specified in the 
relevant clause concerning AVCP in the relevant product specification standard, or equal to the initial period 
(see 5.6.1) in the case of a newly certified cement.  
5.3.4  Evaluation of test results  
5.3.4.1 Each evaluation shall be made on the test results obtained on all autocontrol samples of a given 
certified cement, without selection, taken during the control period preceding the date of the evaluation or 
during the initial period as the case may be.  
5.3.4.2 The evaluation of test results should exclude any test result accepted as an outlier by the product 
certification body, for example in the case of identifying the sampling and testing errors. 
5.3.4.3 In the case of managed step changes in product properties or in the case of limited production or 
dispatching runs during the control period, the corresponding data sets may be evaluated separately.  
5.3.4.4 The evaluations may normally be carried out by correspondence and each evaluation shall lead, 
for the property examined, to a single conclusion in respect of the set of test results as a whole.  
5.3.4.5 The product certification body shall take into account whether all necessary corrective actions and 
measures to prevent non-conforming cement from delivery have been taken by the manufacturer. PUBLIC REVIEW DRAFTDUS 310-2: 2016 
8 © UNBS 2016  – All rights reserved  
 5.3.5  Reports  
Following each evaluation, a confidential report shall be prepared and a copy sent to the manufacturer by the 
product certification body .  
5.4 Audit testing of samples taken at the factory/depot and determination of product-type 
by testing  
5.4.1  Sampling  
Spot samples shall be taken under the responsibility of the product certification body at the point(s) of release 
of cement from the factory and/or depots supplied with cement by the factory. These are taken principally in 
order to provide a check on the accuracy of the manufacturer's test results. Representatives of the product 
certification body shall be granted access to the factory/depots at any time without giving prior notice in order 
to allow the samples to be taken.  
5.4.2  Number of samples  
The number of samples taken shall be at least six per year for each certified cement dispatched continuously 
from the factory. When certain certified cements are not dispatched continuously, this frequency and the point 
of sampling may be altered by mutual agreement between the product certification body and the 
manufacturer.  
The first sample of a cement to be certified is used for determination of the product-type.  
The number of samples to be taken during the initial period (see 5.6.1) shall be at least one per month.  
5.4.3  Properties and test methods  
The mechanical, physical and chemical properties specified for testing in the relevant clause concerning 
AVCP  in the relevant product specification standard shall be determined according to the indicated test 
methods.  
5.4.4  Testing  
5.4.4.1 Each sample taken shall be homogenized and divided into three sub-samples. The methods used 
to take and prepare samples shall be in accordance with DUS 1 00-7.  One sub-sample shall be retained by 
the manufacturer for testing and one shall be packed, sealed, clearly labeled and forwarded to the product 
certification body. The third sub-sample shall be sealed and retained by the manufacturer for a minimum 
period of three months. It is intended for use if:  
a) one of the first two sub-samples is lost, deteriorates or becomes contaminated;  
b) further testing is needed in the event of a dispute.  
5.4.4.2 The firs t two sub- samples shall be tested, one by the manufacturer and one by the product 
certification body, for the required properties as listed in the relevant product specification standard, using the 
test methods indicated in that standard.  
5.4.5  Evaluation of test results  
The results obtained shall be evaluated by the product certification body. The procedures described in annex 
A shall be used for the evaluation of the representativeness and accuracy of the 28-day strength results.  
The results obtained consist of single values with an uncertainty associated. For evaluation only the obtained 
test results shall be considered without taking into account the associated uncertainty of measurement, as this 
is implicitly covered by the AVCP procedures. PUBLIC REVIEW DRAFTDUS 310-2: 2016 
© UNBS 2016  – All rights reserved  9 
 5.4.6  Reports  
5.4.6.1 Following each evaluation of audit test results, a confidential report shall be prepared without 
delay and a copy sent to the manufacturer by the product certification body.  
5.4.6.2 The manufacturer shall have provided his own test results to the product certification body prior to 
its release of the product certification body data. 
5.4.7  Proficiency testing  
The laboratory of the product certification body should carry out regular proficiency testing with other testing 
laboratories in order to maintain the accuracy required.  
5.5 Initial inspection of the factory and the factory production control  
5.5.1  Inspection of a new factory  
In the case of a new factory, an Initial inspection of the factory and the factory production control shall be 
made, based on information on the factory production control and the equipment to be used to produce and 
test the cement(s). The inspection shall, among other things:  
a) verify that the Works' quality manual complies with the requirements of 4.1.2; 
b) verify that the equipment used to produce and test the cement(s) meets the criteria in 5.5.3 and 5.5.4.   
5.5.2  Inspection of an existing factory  
In the case of a new type of cement at an existing factory, information on any significant changes concerning 
the factory production control and the equipment, caused by the production of the new cement, shall be 
considered. This shall form the basis to decide, based on the importance of the changes to the Works' quality 
manual, whether a particular inspection is necessary. In this case any new equipment which has caused a 
major change in the Works' quality manual shall be inspected to verify that it meets the relevant criteria in 
5.5.3 and 5.5.4.  
5.5.3  Criteria for the assessment of the production equipment  
The inspection shall assess the suitability of the production equipment in relation to the Works' quality manual 
and in relation to providing the ability to meet the requirements of the relevant product specification standard. 
The following criteria shall be considered :  
a) the constituents as described in the relevant product specification standard shall be protected against 
contamination within the factory 
b) equipment shall be provided which is suitable for continuous mass production of cement, in particular 
for adequate grinding and homogenization, allowing control of production with sufficient accuracy to 
ensure that the requirements of the relevant product specification standard are met 
c) measures shall be taken to prevent the mixing of different cements during conveying and storage 
d) each cement shall be stored in one or more separate silos, protected to prevent contamination and 
deterioration. The silos may include or take the form of fully enclosed separated air-tight subdivisions. 
Silos and/or discharge points shall be clearly marked with an indication of the cement type, strength 
class and any additional identification required; and 
e) points where cement is released from the factory and/or depot shall allow samples to be taken in 
accordance with the methods in DUS 1 00-7.  PUBLIC REVIEW DRAFTDUS 310-2: 2016 
10 © UNBS 2016  – All rights reserved  
 5.5.4 Criteria for the assessment of laboratories  
5.5.4.1 The laboratory responsible for carrying out the tests required for internal quality control shall have 
at least the equipment needed to carry out the relevant tests indicated or referred to in the Works' quality 
manual (see also 4.2.2)  
5.5.4.2 The laboratory responsible for carrying out autocontrol testing shall have at least the equipment 
needed to carry out tests for the properties listed in the relevant product specification standard using the test 
methods indicated (see 4.3.3).  
5.5.4.3 The laboratories shall demonstrate the ability to provide results within a time and in a manner 
suitable for the manufacturer's factory production control.  
5.5.5  Reports  
Following any initial inspection, a confidential report shall be prepared by product certification body and shall 
be sent to the manufacturer. 
5.6 Evaluation of test results during the initial period  
5.6.1  Initial period  
The duration of the initial period (see 3.5 and Clause 7) shall be three months. 
5.6.2  Evaluation of test results  
The evaluation of test results on the cement shall be based on the autocontrol test results (see 4.3.1) and the 
audit test results (see 5.4.2) obtained from the first sample and from further samples taken during the initial 
period.  
5.6.3  Reports  
Following the evaluation, a confidential report shall be prepared, considered by the product certification body 
and shall be sent to the manufacturer.  
6 Actions in the event of non-conformity  
6.1 Actions to be taken by the manufacturer 
6.1.1  The control of non-conforming cement and the corrective actions to be taken are dealt with in 4.3.2. 
These are the full responsibility of the manufacturer, who shall document the detailed procedures in the 
Works' quality manual.  
6.1.2  In the event of a complaint plus warning, the minimum frequency of autocontrol testing of non-
conforming properties shall be doubled for a period of two months following the warning, unless it can be 
demonstrated to the satisfaction of the product certification body that adequate measures were taken from the 
time of the initial occurrence of the non-conformity until its resolution, including doubling the minimum 
frequency of autocontrol testing for a minimum period of two months. PUBLIC REVIEW DRAFTDUS 310-2: 2016 
© UNBS 2016  – All rights reserved  11 
 6.2 Actions to be taken by the product certification body  
6.2.1  Following continuous surveillance, assessment and evaluation of the factory production 
control (see 5.2) and evaluation of the results of autocontrol testing (see 5.3)  
6.2.1.1 The reports made following the assessment of the factory production control (see 5.2.3) and the 
evaluation of the results of the autocontrol testing (see 5.3.5) shall form the basis, for any decisions/actions 
taken by the product certification body and shall be considered on a case by case basis .  
6.2.1.2 In the event of non -compliances of the f actory production control, the product certification body 
should take appropriate decisions/ actions to ensure that the factory production control is correctly applied by 
the manufacturer. Cancellation of the certificates may be considered in the event of a continuing non -
conformity of the factory production control.  
6.2.1.3 In the event that the results of the manufuacturer testing indicate that the requirements given  in 
the relevant clause – concerning AVCP in the relevant product specification standard are not met, the actions 
taken by the product certification body shall be as shown in Table 1. The product certification body shall check 
that in the event of a complaint plus warning the minimum frequency  of autocontrol testing of non -conforming 
properties has been doubled for a period of two months following the warning (see 6.1).  
6.2.2  Following evaluation of the results of the audit testing of samples taken at the factory/depot 
(see 5.4 and Annex A)  
6.2.2.1 If comparisons carried out of 28-day strengths according to A.3 show deviations indicating 
sampling or testing errors, the reasons shall be identified. Any differences in other properties, which could 
lead to non-conformity, should be identified and appropriate action taken. The product certification body shall 
establish whether appropriate actions have been taken to correct for these deviations and shall specify any 
further actions required including, if necessary, correction of all relevant results .  
6.2.2.2 If the results of the audit testing include a test result outside the specified characteristic value, the 
product certification body shall evaluate the results of the manufacturer's autocontrol testing over an 
appropriate period. If the autocontrol testing is found to be satisfactory, no further action is necessary. If the 
autocontrol testing confirms the findings of the audit testing the actions taken by the product certification body 
shall be as shown in Table 1.  
6.2.2.3 If the results of the audit testing do not meet the single result limit value conformity criteria 
specified in the relevant concerning AVCP in the relevant product specification standard, the actions taken by 
the product certification body shall be as shown in Table 1.  
7 Procedure for third party certification of conformity of performance of the product 
7.1 When a manufacturer applies for certification of a cement, the product  certification body shall arrange 
for an initial inspection of the factory and the factory production control (if required) (see 5.5) and for the  
testing of a product type determination sample of the cement by the product certification body according to 
5.4.1 to 5.4.4 and including evaluation of composition.  
7.2 Given that the inspection (if any) indicate s that the requirements of 5.5 are met and that the results of 
the testing of a product type determination sample conform to the relevant  product specification standard, then 
the product certification body shall issue a certificate of conformity  shall issu e a certificate of constancy of 
performance of the product .  
7.3 During the initial period, the results of the audit testing obtained by the Product certification body and 
the results of the autocontrol testing obtained by the manufacturer shall be evaluat ed by the product 
certification body (see 5.6). For a new factory this shall include an evaluation according to A3.  
7.4 If this evaluation is satisfactory, the certificate of constancy of conformity of the product remains valid 
unless cancelled (or withdrawn as a result of actions taken in the event of non-conformity, see clause 6).  PUBLIC REVIEW DRAFTDUS 310-2: 2016 
12 © UNBS 2016  – All rights reserved  
 7.5 If this evaluation is satisfactory, the certificate of conformity remains valid unless cancelled (or 
withdrawn as a result of actions taken in the event of non-conformity, see clause 6).  
7.6 In the event that a manufacturer permanently ceases production of particular certified cement, he shall 
advise the certification body accordingly and the relevant certificate of conformity shall be cancelled. A 
manufacturer shall be deemed to have permanently ceased production of cement when a period of twelve 
months has elapsed since the date of the last auto control sample.  
7.7 Within a given type or strength class of cement which is already produced at the same factory and for 
which the manufacturer has obtained a certificate of conformity, a particular cement with an intentionally 
different composition, physical or chemical properties or compressive strengths may, if requested by the 
manufacturer, be assessed, certified and identified as a different cement. In such cases, the certificate of 
conformity shall be issued on the basis of the manufacturer's autocontrol testing (see 4.3.1) and the first audit 
sample tested by the Product certification body laboratory (see 5.4).  
Note The procedure for certification of constancy of performance of cement in a new factory (see 3.9) or of a new 
type of cement (see 5.5.2) in an existing factory (see 3.10) is shown in Annex B. 
8 Certificate of constancy of performance of the product and conformity mark  
8.1 indication of constancy of performance of the product 
Conformity of cement to the relevant product specification standard shall be indicated by a certificate of 
constancy of performance the Product issued by the product certification body and the related use of a 
conformity mark by the manufacturer.  
8.2 Certificate of constancy of performance of the product 
The certificate of constancy of performance of the product shall include, in particular:  
a) the name and address of the certification body; 
b) the name and address of the manufacturer and of the factory;  
c) the standard designation of the cement according to the relevant product specification standard and 
any additional identification required;  
d) statement that the cement conforms to the requirements of the relevant product specification standard 
and that the conformity is established according to this Draft Uganda Standard;  
e) the certificate's number. 
8.3 Conformity mark 
The certificate of conformity shall entitle the manufacturer to use the conformity mark on packaging and 
documentation used for the certified cement. The conformity marking shall consist of the conformity symbol 
and shall be followed by:  
a) the identification number of the certification body responsible for certification of conformity; 
b) the name or identifying mark of the manufacturer and of the factory;  
c) the last two digits of the year in which the conformity mark was affixed;  
d) the number of the certificate of conformity; and PUBLIC REVIEW DRAFTDUS 310-2: 2016 
© UNBS 2016  – All rights reserved  13 
 e) the standard designation of the cement according to the relevant product specification standard and 
any additional identification required. 
9 Requirements for dispatching centres  
9.1 General requirements  
9.1.1  Intermediaries operating dispatching centres have a responsibility to maintain the quality, the identity 
and the conformity of certified cements (certified under a certificate of constancy of performance of the 
product issued according to this standard to the manufacturer or importer and bearing the conformity mark).  
9.1.2  The intermediary shall demonstrate that the conformity of the certified cement received is maintained 
during transport, reception, storage, packaging and dispatch and that the quality and the identity of the cement 
is ensured from the manufacturer or importer to the user after dispatch. This should be shown by meeting the 
requirements given in 9.2 and 9.3.  
9.2 Tasks for the intermediary  
9.2.1  Measures to maintain the cement quality  
9.2.1.1 The intermediary shall demonstrate that he has measures in place to maintain the quality of the 
certified cement and shall have a quality manual which describes the quality aims and the organizational 
structure and which adequately covers purchasing, transport, reception, handling, storage, testing and 
dispatch of the cement, taking into account the principles given for the manufacturer in Clause 4.  
9.2.1.2 In particular, these measures shall include appropriate acceptance and identification testing in 
order to demonstrate that the  certified cement delivered to the dispatching centre has not suffered from 
contamination or ageing and corresponds to the cement specified in the purchasing or delivery contracts. In 
addition appropriate measures shall be taken to ensure that different cements (different types, strength 
classes and/or origin) are kept separate and are stored in separate silos and that contamination of cement is 
avoided.  
9.2.1.3 The minimum frequency of the reception identification testing is one test per delivery, but at least 
one test per 500 tonnes. The properties to be determined for rapid identification (for example fineness, loss on 
ignition or colour) may be chosen by the intermediary, subject to approval by the product certification body.  
9.2.2  Confirmation autocontrol testing of samples taken at the dispatching centre  
9.2.2.1 For certified cement, the intermediary shall carry out confirmation autocontrol testing of samples 
to verify that the cement maintains its properties. The frequency of sampling and testing, the test properties 
and the test methods shall be at least as specified in Table 2. The results of the autocontrol testing carried out 
at the dispatching centre and at the factory supplying the certified cement should be compared. The 
dispatching centre shall ensure that the factory’s autocontrol results are made available according to an 
adequate frequency. 
9.2.2.2 The confirmation autocontrol testing may be carried out in the laboratory of the intermediary or in 
an external laboratory. Representatives of the product certification  body shall be granted access to the 
laboratory in ord er to verify that the equipment used to test the cement meets the criteria of 5.5.4 and 4.3.3.  
9.2.2.3 The individual results of confirmation autocontrol testing carried out by an intermediary in respect 
of each certified cement shall remain within the range of the maximum and minimum values of the relevant 
manufacturer's autocontrol results in any given control period. The individual results of the confirmation 
autocontrol testing shall at no time exceed the limit values for single results of the relevant specification 
standard. PUBLIC REVIEW DRAFTDUS 310-2: 2016 
14 © UNBS 2016  – All rights reserved  
 9.3 Tasks for the third party 
9.3.1  Continuous surveillance, assessment and evaluation of the measures to maintain the cement 
quality and of the confirmation autocontrol  
9.3.1.1 The task of the third party is the continuous surveillance, assessment and evaluation of the 
measures applied by the intermediary to maintain the cement quality; the product certi fication body shall carry 
out an initial inspection and, thereafter at least once per year, an inspection. 
9.3.1.2 The third part y shall check by inspection at least twice a year that the results of the 
intermediary's, confirmation autocontrol testing conform to 9.2.2. If the results of the autocontrol testing are 
outside the range of the maximum and minimum values of the autocontro l testing at the factory for a relevant 
control period, the right to continue to use the conformity mark shall be based on a case -by-case assessment. 
The dispatching centre shall make the necessary provision for allowing the third party to make the 
assessm ent. 
9.3.1.3 The observation of non -conformity to a single result limit value shall lead to a decision from the 
third party (9.3.3)  
9.3.1.4 Following the inspection, the third party shall prepare a confidential report on its assessment and 
send this to the  intermediary.  
9.3.2  Audit testing of samples taken at the dispatching centre 
Sampling and testing shall be carried out under the responsibility of the third party as in 5.4.1, 5.4.3 and 5.4.4. 
Each sample shall be packed, clearly labelled and forwarded to the product certification body.  
The frequency of confirmation and audit testing, the test properties and the test methods shall be at least as 
specified in Table 2.  
9.3.3  Decisions to be taken  
The third party shall decide on the basis of all its findings, whether the intermediary has met the requirements 
of 9.1 to maintain the quality, the identity and the conformity of the certified cement so that the continuation of 
the use of the conformity mark is justified. 
Table 1 — Actions to be taken by the product certification body in the event of non-conformity of the 
results of autocontrol and/or audit testing  
Criterion  Item Non-conformity 
of test result(s)a Action to be taken by product certification body  
Issue of a 
complaint  Issue of a 
complaint plus 
warningb Withdrawal of 
certificate of 
constancy of 
performance of 
the productc 
Specified 
characteristic 
value  Autocontrol 
testing  All 
results in 
control 
period  Non-conformity of 
the test results 
with the 
requirements of 
the statistical 
conformity criteria 
specified in the 
relevant product 
specification 
standard  First non -
conformity 
of the test 
results  Non-conformity 
of the test 
results for the 
same property in 
two consecutive 
statistical 
assessments d Non-conformity 
of the test results 
for the same 
property  in three 
consecutive 
statistical 
assessments  
Single result 
limit value  Autocontrol 
testing and 
audit Individual 
results  Non-conformity of 
any result with 
the requirements First non -
conformity 
of a test Second non -
conformity of a 
test result for the Third non -
conformity of a 
test result for the PUBLIC REVIEW DRAFTDUS 310-2: 2016 
© UNBS 2016  – All rights reserved  15 
 testing  of the single 
result limit value 
conformity criteria 
specified in the 
relev ant product 
specification 
standard  result  same property 
within 12 f 
months e same property 
within 12 f 
months e 
a Non-conformities for different properties are treated separately.  
b The minimum frequency of autocontrol testing shall be doubled for a period of two months following receipt of a complaint 
plus warning, unless it can be demonstrated to the satisfaction of the product cert ification body that adequate measures were 
taken from the time of the initial occurrence of the non -conformity until it's resolution, including doubling the minimum frequency 
of autocontrol testing for a minimum period of two months.  
c Withdrawal is always  based on a case by case assessment.  
d In the case of the upper limit of the standard strength the issuing of a complaint plus warning should be based on a case by 
case decision.  
e Only if information on the preceding non -conforming test result has been av ailable at the time of sampling.  
f 24 months for masonry cement conforming to  ASTM C 91  
 
Table 2 — Confirmation and audit testing of samples of certified cement taken at dispatching centres: 
properties and minimum testing frequencies a 
Properties to be tested b, c Minimum testing frequencies  
Confirmation autocontrol by the intermediary  Audit testing by the 
third party  
Cement unloaded and 
stored at the dispatching 
centre  Cement transshipped at 
the dispatching centre  
Early strength  1/week  1 per deliv ered lot but at 
least  
1 per 500 tonnes  6/year  
Standard strength  
Initial setting time  1/week  
Insoluble residue  1/week  
Loss on ignition  
SO 3 content  1/week  
Heat of hydration  1/every 2 months  
Pozzolanicity  2/month  
C3A in clinker  1/mont h 
Air content  1/fortnight  
a The methods used to take and prepare samples shall be in accordance wit h the requirements of DUS  100-7 
b If required by the relevant  product specification standard  
c Using the test methods referred to in the relevant produ ct specifications standard  PUBLIC REVIEW DRAFTDUS 310-2: 2016 
16 © UNBS 2016  – All rights reserved  
 Annex A 
(normative)  
 
Evaluation of the representativeness and the accuracy of the 28 day 
strength test results 
A.1 General 
This Annex describes the procedures to be used to evaluate the representativeness and the accuracy of the 
28-day strength test results. The evaluation shall preferably be made in connection with the routine yearly 
inspection by the inspection body.  
A.2 Sets of results considered  
A.2.1 The evaluation procedure considers the following three sets of test results:  
-A all test results from the autocontrol testing during the period under consideration; 
-B the result of tests carried out by the manufacturer on samples taken for audit testing; and 
-C the results of tests carried out by the testing laboratory on samples taken for audit testing. 
A.2.2 The number of results in each of the sets B and C is at least six. They should be equally distributed 
throughout the period under consideration. 
A.3 Evaluation procedure  
A.3.1 Introduction  
The evaluation procedure includes two parts, as described in A.3.3 and A.3.4. For masonry cement see also 
A.3.5. The symbols used are listed in A.3.2.  
A.3.2 Symbols PUBLIC REVIEW DRAFTDUS 310-2: 2016 
© UNBS 2016  – All rights reserved  17 
  
Symbol  Meaning  
MA is the average of all results of the autocontrol testing during the period under 
consideration  
MB is the average of the results of the tests carried out by the manufacturer on the 
samples taken for audit testing.  
MC is the average of the results of the tests carried out by the testing laboratory on 
samples taken for audit testing  
NB is the number of  the samples taken for audit testing  
SA is the standard deviation of all results of the autocontrol testing during the period 
under consideration  
SD is the standard deviation of the differences between the corresponding results of the 
samples taken for a udit testing as defined by d i = B j- Ci 
Where  
Bj is the individual test result by the manufacturer  
Cj  is the corresponding individual test result by the testing laboratory  
SD 
 2/12 21   B B i i N N d d  
A.3.3 Evaluation of whether set A and set B belong to the same population (sampling error 
check)  
A.3.3  Evaluation of whether set A and set B belong to the same population (sampling error check)  
a) Where M A – MB  2.0  MPa 
NOTE the two sets of results may be considered to belong to the same population.  
b) Where 
MPa,2.0 M M2)
B A  
1) if  
1/2
B A B A N/S 2.58 M M   
NOTE the two sets of results are considered to belong to the same population. 
2) If 
1/2
B A B A )N/S 2.58 M M   
The reason shall be identified by the manufacturer. (In this case, the two sets of test results can be considered 
to belong to different populations with a confidence level of 99 % as described in ISO 2854.)  
A.3.4 Comparison between set B and set C in order to check the accuracy of the autocontrol 
testing (testing error check)  
A.3.4.1 Two conditions should be satisfied:  
a) S D  3.4 Mpa; and 
b) MB — M C  4.0 MPa 
NOTE There are values applicable for cement conforming to DUS  310-1. The values for masonry cement are given 
in A.3.5. Values for other cements are indicated in the relevant product specif ication standard.  PUBLIC REVIEW DRAFTDUS 310-2: 2016 
18 © UNBS 2016  – All rights reserved  
 A.3.4.2 If either or both of these conditions are not satisfied the reasons shall be identified by the 
manufacturer and the inspection body.  
A.3.5 Masonry cement  
For masonry cement (see ASTM C 91) the following numerical criteria given in table A2 shall apply in place of 
the values given in A.3.3 and A.3.4: PUBLIC REVIEW DRAFTDUS 310-2: 2016 
© UNBS 2016  – All rights reserved  19 
 Table A.2 — Numerical criteria for masonry cement conforming to ASTM C 91 
Criterion  Masonry cement, type /class  
MC5  MC12.5/MC12.5X  MC 22.5X  
MA-MB 1 1.0 2.0 
SD 1.7 2.4 3.4 
MB-MC 2.0 2.0 4.0 
 
A.3.6 Calcium aluminate cement 
For calcium aluminate cement conforming to EN 14647 the numerical criteria given in Table A.3 shall apply in 
place of the values given in A.3.3 and A.3.4. 
Table A.3 — Numerical criteria for calcium aluminate cement conforming to EN 14647 
Criterion  Calcium aluminate cement  
MA-MB 3.0 
SD 5.0 
MB-MC 5.0 
 PUBLIC REVIEW DRAFTDUS 310-2: 2016 
20 © UNBS 2016  – All rights reserved  
 Annex B  
(informative) 
 
Procedure for certification of constancy of performance of cement 
 PUBLIC REVIEW DRAFTDUS 310-2: 2016 
© UNBS 2016  – All rights reserved  21 
 Bibliography 
[1] CEN/TR 14245, Cement – Guidelines for the application of EN 197-2 Conformity evaluation 
[2]  [3] EN 45020, Standardization and related activities — General vocabulary  
[4] ISO 9000, Quality management systems — Fundamentals and vocabulary  
[5] EN 197-2: 2014; Cement – Part 2; Conformity evaluation  
[6] EN 196-1, Methods of testing cement — Part 1: Determination of strength  
[7] EN 197-1, Cement — Part 1: Composition, specifications and conformity criteria for common cements  
[8] EN 14216, Cement — Compos ition, specifications and conformity criteria for very low heat special 
cements  
[9] EN 15743, Supersulfated cement — Composition, specifications and conformity criteria  
[10] ISO/IEC 17020, Conformity assessment — Requirements for the operation of various t ypes of bodies 
performing inspection  
 PUBLIC REVIEW DRAFTPUBLIC REVIEW DRAFTDUS 310-2 : 2016  
© UNBS 2016  – All rights reserved  23 
 Certification marking 
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordance with the 
certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 PUBLIC REVIEW DRAFTDUS 310-2: 2016    
 
ICS nn.nnn.nn  
Price based on nn pages 
© UNBS 2016 – All rights reserved