DEAS 246 :2021  
ICS 59 .080.01  
 
© EA C 2021                                                                                                                          Second Edition 2021   
 DRAFT EAST AFRICAN STANDARD  
Method for determination of added oil content of sisal or jute yarn or 
fabric  
EAST AFRICAN COMMUNITY  
 
 
 
 DEAS 246 :2021  
ii © EAC 2021  – All rights reserved  
 Copyright notice  
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Violators may be prosecuted . DEAS 246 :2021 
© EAC 2021  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ............................  iv 
Introduction  ................................ ................................ ................................ ................................ .........................  v 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Principle  ................................ ................................ ................................ ................................ .................  1 
5 Reagent  ................................ ................................ ................................ ................................ ..................  1 
6 Apparatus  ................................ ................................ ................................ ................................ ...............  2 
7 Conditioning  ................................ ................................ ................................ ................................ ..........  2 
8 Test sample and test specimen  ................................ ................................ ................................ ...........  2 
8.1 Test sample  ................................ ................................ ................................ ................................ ............  2 
8.2 Test specimens  ................................ ................................ ................................ ................................ ...... 2 
8.3 Conditioned test specimens  ................................ ................................ ................................ ................  2 
8.4 Dry extracted test specimen  ................................ ................................ ................................ ................  3 
9 Procedure  ................................ ................................ ................................ ................................ ...............  3 
10 Calculation and expression of results  ................................ ................................ ................................  3 
10.1  General  ................................ ................................ ................................ ................................ ...................  3 
10.2  Method based on the test specimen as received  ................................ ................................ ...............  3 
10.3  Method based on the conditioned mass of a test specimen  ................................ ............................  4 
10.4  Method based on the dry mass of extracted test specimen  ................................ .............................  4 
10.5  Method based on the dry mass with the addition of recommend ed allowance for moisture 
and natural or added solvent –soluble matter.  ................................ ................................ ...................  4 
11 Test report  ................................ ................................ ................................ ................................ ......................  4 
Bibliography  ................................ ................................ ................................ ................................ ........................  6 
 
 DEAS 246 :2021  
iv © EAC 2021  – All rights reserved  
 Foreword  
Development of the East African Standards has been necessitated by the need for harmoniz ing requirements 
governing quality of products and services in the East African Community. It is envisaged that through 
harmonized standardization, trade barriers that are encountered when goods and services are exchanged 
within the Community will be remov ed.  
The Community has established an East African Standards Committee  (EASC)  mandated to develop and 
issue East African Standards  (EAS) . The Committee is composed of representatives of the National 
Standards Bodies in Partner States, together with the rep resentatives from the public and private sector 
organizations  in the community .  
East African Standards are developed through  Technical Committees that are representative of key 
stakeholders including government, academia, consumer groups, private sector a nd other interested parties. 
Draft East African Standards are circulated to stakeholders through the National Standards Bodies in the 
Partner States. The comments received are discussed and incorporated before finalization of standards, in 
accordance with the Principles and procedures for development of East African  Standards.  
East African Standards are subject to review, to keep pace with technological advances. Users of the East 
African Standards are therefore expected to ensure that they always have the latest versions of the standards 
they are implementing .  
The committee responsible  for this document is Technical Committee EASC/TC 061, Textiles, textile products 
and accessories . 
Attention is drawn to the possibility that some of the elements of this doc ument may be subject of patent 
rights. EAC shall not be held responsible for identifying any or all such patent rights.  
This second edition cancels and rep laces the first edition (EAS 246:2001 ), which has been technically revised. 
The main changes compared  to the previous edition are as follows:  
— A clause on normative references has been added;  DEAS 246 :2021 
© EAC 2021  – All rights reserved  v 
 Introduction  
Light mineral oil, as an oil -in-water emulsion, is added to sisal or jute fibres during spinning (conversion to 
yarn), and some or all of this oil is pr esent in the sisal or jute after or at later stages of manufacture. This East 
African Standard describes a method for the determination of added oil in sisal or jute, based on the extraction 
of the oil by an organic solvent. All organic solvents, however, extract some of the natural constituents of sisal 
or jute and an allowance has to be made in quantitative determinations of the added oil. The recommended 
solvent for this method and the procedure used has been found to extract between 0.1 %  and 0.2  % of t he 
natural constituents of sisal or jute.  
.DRAFT EAST AFRICAN STANDARD  DEAS 246 :2021 
 
© EAC 2021  – All rights reserved  1 
 Method for determination of added oil content of sisal or jute yarn or 
fabric   
1 Scope  
This Draft East African Standard prescribes  a method for determination of added oil content of sisal or jute 
yarn or fabric  or a combination of sisal and jute fabric . 
2 Normative references   
The following documents are referred to in the text in such a way that some or all of their content constitutes 
requirements 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.  
ISO 139, Textiles — Standard atmospheres for conditioning and testing  
3 Terms and definitions   
No terms and definitions are listed in this do cument.  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  
4 Principle  
A known amount of a test specimen is extracted with light petrole um in a soxhlet apparatus under defined 
conditions. The solvent is removed by distillation and the extract is weighed.  
The mass of the extract is expressed as percentage on one of the following basis:  
a) the mass of the test specimen as received;  
b) the mass of the test specimen conditioned in the standard atmosphere for testing of textiles;  
c) the dry mass of the extracted test specimen;  
d) the dry mass of the extracted test specimen with the addition of the recommended allowance for 
moisture and natural or added  solvent -soluble matter.  
5 Reagent  
Light petroleum, redistilled, boiling range 40 °C to 60 °C.  DEAS 246:2021  
2 © EAC 2021  – All rights reserved  
 6 Apparatus  
6.1 Soxhlet extractors , 200 ml to 300 ml capacity.  
6.2 Extraction flasks,  flat-bottomed, 250 ml to 500 ml capacity.  
6.3 Double -surface or coin type  reflux condensers.  
6.4 Heating unit , temperature -controlled, for use with soxhlet extractors.  
6.5 Distillation unit,  e.g. water or steam bath.  
6.6 Balance,  accurate to within 0.2 mg.  
6.7 Stoppered  weighing bottles.  
6.8 Soxhlet  thimbles, previously ex tracted with the solvent.  
6.9 Desiccator .  
6.10 Ventilated oven , for drying test specimens at 105 °C ± 3 °C.  
6.11 Suction pump and adapter  
7 Conditioning  
If the result is to be expressed on the mass of the conditioned test specimen, conditions the test s pecimen in 
the standard atmosphere for testing of textiles as described in  ISO 139 .  
If the result is to be expressed on any other basis (see 4), conduct the test in ordinary laboratory conditions.  
8 Test sample and test specimen  
8.1 Test sample  
Sample a t random, a test sample, representative of the bulk and of sufficient size for at least two test 
specimens each weighing 5 g to 20 g. Determine the mass of the test specimen.  
8.2 Test specimens  
If the result is to be expressed on the basis of the test sa mple as received, divide the test sample into test 
specimens and place each test specimen in a separate weighing bottle (see 6.7) and stopper the bottle.  
Weigh the bottles with their test specimens, and calculate the mass of each test specimen.  
8.3 Condi tioned test specimens  
If the result is to be expressed on the basis of the mass of the conditioned test specimen divide the test 
sample into test specimens and place each in a separate weighed weighing bottle (see 6.7). Condition the test 
specimen by plac ing the open bottle in an enclosure at the standard atmosphere for testing of textiles for 24 
hours.  Stopper the bottle. Weigh the bottle and test specimen, and calculate the mass of the conditioned test 
specimen.  
 NOTE  The weighing need not be made in t he standard atmosphere for testing of textiles.  DEAS 2 46:2021  
© EAC 2021  – All rights reserved  3 
 8.4 Dry extracted test specimen  
If the result is to be expressed on the mass of the dry, extracted test specimen, condition the test sample, 
before taking the test specimens, in the ordinary laboratory atmo sphere for 24  h. 
9 Procedure  
Place the test specimens in a thimble ( 6.8) in a soxhlet extractor ( 6.1). Add approximately 200ml of light 
petroleum ( 5) to a clean, dry extraction flask ( 6.2), previously weighed to an accuracy of 0.001 g, and carry out 
the e xtraction for a time such that the extractor siphons at least ten times. Disconnect the apparatus and 
remove the bulk of the solvent by distillation ( 6.5). Remove the remainder of the solvent by the following 
method. Connect the flask ( 6.2) by means of a s uitable adapter to a suction pump ( 6.11). Reduce the 
pressure in the flask to 1.33 kPa to 4.00  kPa for not less than 12 min and not more than 15 min while warming 
the flask at 60 °C to 65 °C. Release the vacuum through a side tube fitted with a cotton wool  filter before 
disconnecting the adapter.  
If the pressure of 1.33  kPa to 4.00  kPa cannot be obtained, pass a stream of air through the flask using the 
following method. Stopper the flask with a stopper containing an inlet and outlet tube, neither of which  projects 
below the neck of the flask.  Heat the flask on a water bath at 60 °C to 65 °C, and by means of a vacuum 
supply draw a stream of air (300  ml/min measured at atmospheric pressure) through the flask for 15 min, with 
the pressure inside the flask re duced to 26.60 kPa.  
If the result is required on the basis of the dry mass of the extracted test specimen or of the mass of the test 
sample as received, remove the thimble from the soxhlet extractor, allow the solvent to evaporate and transfer 
the extract ed test specimen to a tared weighing bottle. Dry the test specimen and bottle in an oven at 105°C ± 
3 °C for at least 3  h, cool in a desiccator ( 6.9) and determine its mass.  
10 Calculation and expression of results  
10.1 General  
Calculate the mass of the dry extract as a percentage of the mass of a test specimen by one of the methods 
detailed in 10.2 to 10.5. Express the result as the average (mean) for two or more test specimens.  
Express all results to the nearest 0.1%.  
NOTE  In all formulae the recommen ded value for (a) is 17.0 and the recommended value of (b) is 0.15.  
10.2 Method based on t he test specimen as received  
Calculate the percentage of added oil, P, %) of the test specimen as received using the following expressions.  
 
Where;  
M is the mass o f the test specimen as received (in g).  
b is the percentage of naturally occurring oil and wax in the test specimen, removed during the extraction;  
m is the mass of the extract (in g);  DEAS 246:2021  
4 © EAC 2021  – All rights reserved  
 10.3 Method based on the conditioned mass of a test specimen  
Calcula te the percentage of added oil, Po, using the following expression:  
 
where  
b is the percentage of naturally occurring oil and wax in the test specimen, removed during extraction;  
m is the mass of extract (in g)  
 Mo is the conditioned mass of the test s pecimen (in g).  
10.4 Method based on the dry mass of extracted test specimen  
Calculate the percentage of added oil, Pd, using the following expression:  
 
where  
b is the percentage of naturally occuring oil and wax in the test specimen, removed during extr action;  
m is the mass of the extract (in g);  
Md is the dry mass of the extracted test specimen (in g).  
10.5 Method based on the dry mass with the addition of recommended allowance for 
moisture and natural or added solvent –soluble matter.  
Calculate the p ercentage of added oil on the bases of dry mass plus allowance, Pr, using the following 
expression:  
 
where  
a is the recommended allowance for moisture and natural or added solvent -soluble matter  
Pd is the percentage of added oil based on dry mass.  
11 Test report  
The test report shall include the following information:  
a) reference to this East African Standard;  
b) a description or reference of the sample tested;  
c) the basis on which the test results were calculated;  
d) the individual results and their mean; ex pressed as in clause 10;  DEAS 2 46:2021  
© EAC 2021  – All rights reserved  5 
 e) any departure from the method described, e.g. owing to insufficient material being available.  DEAS 246:2021  
6 © EAC 2021  – All rights reserved  
 Bibliography  
EAS 246 :2001, Method for determination of added oil content of sisal or jute yarn or fabric  
 DEAS 2 46:2021    
 
© EAC 2021  – All rights reserved