TBS/CDC 7(542 0) P3 
 
©TBS 2018 – All rights reserved                                                                                                    First Edition 2018  
 
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DRAFT TANZANIA STANDARD  
 
 
 
 
 
 
 
TBS/CDC 7(542 0) P3 Adhesives — Ethyl and methyl cyanoacrylate – 
Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TANZANIA BUREAU OF STANDARDS  
 
 
 
 
 TBS/CDC 7(542 0) P3 
 
©TBS 2018 – All rights reserved                                                                                                    First Edition 2018  
 
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Foreword  
 
This Draft Tanzania Standard is being developed by Industrial and Laboratory Chemicals Technical Committee 
under supervision of the Chemicals Divisional Standards Committee and it is in accordance with the procedures 
of the Bureau.  
 
This Draft Tanzania Standard has b een prepared with assistance drawn from:  
BS 7969 : 2004  (Current, confirmed July 2014 ) Adhesives - Ethyl and methyl cyanoacrylate types 1, 2 
and 3 , published by British Standards Institution ; and  
US 1512: 2014Adhesives — Ethyl and methyl cyanoacrylate types 1, 2 and 3 — Specification , 
published by Uganda National Bureau of Standards.  
 
In reporting results of a test or analysis made in accordance with this standard, if the final value, calculated or 
observed is to be rounded off, it shall b e done in accordance with TZS 4 Rounding off numerical values . 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 DRAFT TANZANIA STANDARD                                                         TBS/CDC 7(542 0) P3 
 
Adhesives — Ethyl and methyl cyanoacrylate – Specification  
1. Scope  
This Draft Tanzania  Standard specifies requirements , sampling and methods of test for adhesives – ethyl 
and methyl cyanoacrylate . 
2. Normative References  
The following referenced document sare indispensable for the application of this document , the latest edition of 
the referenced document s (including any amendments) applies;  
ASTM D1084 Standard Test Methods for Viscosity of Adhesives  
ISO 15605 Adhesives – Sampling  
ISO 10365 Adhesives — Designation of main failure patterns  
 
3 Terms and definitions  
For the purposes of this standard, the following terms and definitions shall apply.  
3.1 
adhesive  
substance capable of holding materials together by surface attachment  
3.2 
adherend  
body that is, or is intended to be, held to another body by anadhesive  
3.3 
shear  
mode of application of a force to a joint that acts in the plane of the bond -line. The force may be applied in 
longitudinal compression or tension or torsion.  
3.4  
Viscosity  
quantity expressing the magnitude of internal friction in  a fluid  resisting uniform flow  
4. Requirements  
4.1 General requirement  
4.1.1 The material shall be free from visible impurities and foreign matter as assessed by visual inspection.  
4.1.2 The Material shall be of the following types  
Type 1 – low viscosity adhesive  
Type 2 – medium viscosity adhesive  
Type 3 – high viscosity adhesive  
 
4.2 Specific chemical and physical requirements  
The material shall comply with the specific requirements in Table 1 when tested in accordance with the methods 
indicated therein.  
Table 1 – Specific chemical and physical requirements for adhesive cyanoacrylate  
S/N Characteristic  Requirement  Method of 
test Type 1  Type 2  Type 3  
1.  Viscosity at  
(25 ± 1) °C in  
MPa.s* Minimum   20 1000  
ASTM D1084  Maximum  10 200 4000  
2.  Minimum  
bond strength,  
MPa * For ethyl  
cyanoacrylate  17 17 17 
Annex A  For methyl  
cyanoacrylate  22 22 22 
3.  Rapid setting property  Satisfactory if three successive  joints 
can be made having bond strengths of 
not less than 2.4 MPa *  Annex B  
*MPa  stand for mega pascal  
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5. Sampling  
The material shall be sampled according to the method specified in ISO 15605 . 
 
6. Pack aging and labelling  
 
6.1 Packaging  
The material shall be packaged in suitable sealed containers .  
6.2 Labelling  
Each container shall bear the following information in English and/or Swahili written  in prominent, legible and 
durable labelling:  
a) Name and type of the material . 
b) Manufacturer’s name  and address .  
c) Recognized trade mark, if any.  
d) Net content . 
e) Batch number.  
f) Date of manufacture and expir y 
g) Pictorial symbol to show hazardous  nature.  
h) Storage condition  
 
 
 
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©TBS 2018 – All rights reserved                                                                                                    First Edition 2018  
 
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 Annex A  
(normative) 
Method of test for the determination of bond strength  
A.1 General  
This method of test is for adhesives using rigid adherends that can be produced to the required dimensional 
tolerances and that will withstand the forces applied to them. This test method is primarily intended for use in 
normal ambient conditions.  
A.2 Adherend test pieces  
Twelve mild steel lap shear test pieces (3 mm x 100 mm x 25 mm) cut from flat sheet, free from burrs and 
meeting the flatness requirements shall be used with thickness of tolerance (3.0 ± 0.15) mm for non -metal 
adherends shall be emplo yed. 
The adheren d shall be rectangular with the following dimensions:  
i. Length:  (100 ± 1 .5)  mm; 
ii. Width:  (25 ± 0.25) mm;  
iii. Flatness: within 0.5 mm over the length and width of the area of the specimen to be bonded and 
within 1.0 mm over the length of the specimen.  
The thickness of the adherends shall be such that they are able to withstand the forces that are required for the 
test, and shall be stated in the report.  
NOTE : The choice of the thickness of the adherends depends on the adherend materials, the adhesive and on the particular 
application and should be agreed between the purchaser and the supplier of the adhesive. For general use the following 
thicknesses are recom mended:  
i. Metal:  (1.5 ± 0.15) mm;  
ii. Non- metals (other than wood): (3 ± 0.15) mm; and  
iii. Wood:  (5 ±0.15) mm  
If the central adherend in a double overlap joint is of the same material as the two outer adherends, it shall have 
a thickness of twice that of one of the outer adherends.  
A.3 Preparation of adherends  
A.3.1  General requirements  
The bonding surface shall be plane and free from visible signs of rust.  
A.3.2  Surface pre -treatment  
Remove loose contamination and oily deposits from the mild steel adherend by wi ping with lint -free absorbent 
cloth, wetted with propan -2-ol. Allow to dry. Blast the bonding surface of the adherends with 80  μm silicon  
carbide grit and wipe again with propan -2-ol to remove grit. Allow to dry.  
A.4 Preparation of sample  
A.4.1  Before bond ing, prepare the surfaces of the adherends in accordance with the recommendations in the 
instructions supplied by the manufacture of the adhesive. In the absence of such recommendations, use ISO 
17212.  
A.4.2  Apply a small drop of adhesive to the centre of a clean prepared face of the adherend. Immediately spread 
the adhesive evenly over the bonding area using the clean prepared face of a second adherend and bring the 
two surfaces into contact b) means of the alignment jig. Apply a pressure of 35 kPa, equivalent to a mass of 
1.115 kg for this joint configuration, to the bond. It is permissible to remove the mass from the jig after five 
minutes to make repeat specimens. Once the required number of specimens have  been assembled, leave the 
weight on the bonded area for the duration of cure.  
A.4.3  The correct quantity of adhesive is such that a small excess is forced out around the joint. Remove this 
excess, taking care not to upset the alignment whilst maintaining the pressure exerted by the weight. Prepare 
six joints using this method.  
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 A.5 Condit ioning and testing  
A.5.1  Conditioning  
Leave the assembled joints under pressure in the alignment jig and maintain the assemblies at 15 ⁰C– 25⁰C for 
24 h.  
NOTE : Since moisture catalyses the chemical reaction involved in bond formation, the curing time can be affected by the 
humidity of the air at the time of test.  
A.5.2 Testing  
Locate the assembly symmetrically in the testing machine with each grip (50  ± 20) mm from the nearest edge 
of the overlap. Ensure that the longitudinal force applied by the machine acts in the plane of the bond plane by 
using packing pieces or other methods. When testing a double overlap joint, in order to avoid distorting the 
adherends, p lace a packing piece within the grips between the adherends. Set the machine in motion. Operate 
the machine so that the test joint is subjected to either:  
a) a force that increases at a constant rate; or  
b) a constant rate of separation;  
Such  that in either case the joint is broken in a period (65  ± 20)s.  
NOTE 1 : The machine should be operated under substantially constant conditions throughout the test although a load  
displacement diagram may indicate non -linearity at the commencement and end of the test.  
NOTE 2 : If no previous experience is available for the type  of the joint under test, preliminary tests should be carried out to 
establish suitable operating conditions.  
NOTE 3 : Because of the differing moduli of different adhesives, extra specimens might need to be manufactured in order to 
determine the precise co nditions that will give the required time lapse.  
Record the highest force during rupture as the breaking force of that specimen. Discard results from test 
specimens that show starved joints or that rupture in the adherend, unless the test has been conducte d to 
assess compliance with a minimum requirement that has been met or exceeded. Record the mode of failure in 
accordance with ISO 10365.  
A.6 Expression of results  
Report results. The mean of six determinations shall be expressed as the breaking shear stress in megapascals 
(MPa).  
 
 
 
 
 
 
 
 
 
 
 
 
 
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Annex B  
(normative)  
Method of test for the determination of rapid setting properties  
B.1 Principle  
The method is designed to determine the rapid setting properties of cyanoacrylates by preparing specimens as 
described in Annex A and assessing the strength after five minutes.  
B.2 Procedure  
Follow the procedure of A. 2 through to A.  4. Assemble an individual specimen as described in A.4, apply the 
weight for five minutes, remove from the jig and immediately test in accordance with A.5.2. Test a maximum of 
six specimens.  
B.3 Accepta nce criteria  
The rapid setting property is satisfactory if three successive joints tested have a bond strength of not less than  
2.4M Pa 
.TBS/CDC 7(542 0) P3 
 
©TBS 2018 – All rights reserved                                                                                                    First Edition 2018  
 
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