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 DRAFT TANZANIA STANDARD  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TBS/CDC -2(5414) P2 Glass cleaner, liquid –Specification  
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TANZANIA BUREAU OF STANDARDS  
  
 
 
    
 
 
 
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 Foreword  
 
This Draft Tanzania Standard was developed by the Soap and Detergents Technical Committee 
under supervision of the Chemicals Divisional Standards Committee and it is in accordance with the 
procedures of the Bureau.  
 
In the preparation of this Draft Tanzani a Standard assistance was drawn from IS 8540:2016 Glass 
cleaner, liquid ; published by the Indian Standards Institutes  
 
In reporting the results of analysis of a test if the final value is to be rounded off, it shall be done in 
accordance with TZS 4  Roundin g off numerical values  
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DRAFT TANZANIA STANDARD                              TBS/CDC -2 (5224) P 3 
 
 
Glass cleaner, liquid –Specification  
 
1 Scope  
 
1.1 This Draft Tanzania Standard prescribes the requirements, methods of sampling and test for glass 
cleaner, liquid.  
 
1.2 This Draft Tanzania Standard is applicable for the liquid glass cleaner intended primarily for use 
on wind shields, windows, doors, globes, shells, tableware, glass mirrors, and the surfaces of other 
glassware/products. It is not inte nded for use on transparent plastic surfaces and laboratory 
glassware.  
 
2. Normative references  
 
The following referenced documents are indispensable for the application of this document. The latest 
edition of the referenced document (including any amendments) applies.  
 
ASTM D -56 Standard Test Method for Flash Point by Tag Closed Cup Tester  
 
TZS 646/ISO 4316  Surface active agents - Determination of pH of aqueous solutions - Potentiometric 
method  
 
TZS 649/ISO 4317 Surface -active agents and detergents — Determination of water content — Karl 
Fischer method  
 
TZS 59/ISO 3696 Water for analytical laboratory use – Specification and test method  
  
3. Requirements  
 
3.1 General requirements  
 
3.1.1 The cleaner shall be a clear and homogenous liquid or a suitable suspension of solid matter in 
the medium and shall acquire homogeneity on shaking.  
3.1.2 The cleaner shall not have any no objectionable odour.  
3.1.3  The cleaner may be tinted in suitable stable colour.  
3.1.4 The cleaner  shall not impart stain to glass surfaces.  
 
3.1.5 The cleaner shall have no injurious effect on human skin and shall be free from toxic 
ingredients.  
3.1.6 The cleaner shall be stable in normal conditions of storage and handling.  
3.1.7 The cleaner shall be capable of smooth, uniform and easy application . 
 
3.2 Specific requirements  
 
3.2.1  The applied film shall be easily removable within 3 to 4 minutes of application and shall leave 
the surface clean when tested as described in Annex B  
 
3.2.2  The cleaner shal l not produce visible corrosion or discolouration on an aluminium panel, when 
tested as described in Annex C  
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 3.2.3  The material shall also comply with the requirements given in Table 1 when tested by the 
appropriate methods as indicated in column 3 of the Table.  
 
Table 1: Requirements for glass cleaner, liquid  
 
S/No  Characteristic  Requirement  Method of test  
i.  Water content, percentage by 
mass, max  88.0 TZS 649/ISO 4317  
ii.  Flash point, ºC, min  27 ASTM  D56 
iii.  Non-volatile matters content, 
percentage by mass, max  1.0 Annex D  
 
 
3.3 Shelf life  
It shall retain the properties as specified from 3.1 and Table 1 for 2 years from the month and year of 
manufacture when stored at room temperature.  
  
4. Packaging and labelling   
 
4.1 Packing  
 
4.1.1  The glass cleaner shall be packed in a suitable container that will maintain the quality of the 
product. It may have an in -built spray device.  
 
4.1.2  The container shall be leak -proof and the spray device, if  used, shall be protected against any 
damage during transit.  
 
4.2 Labelling  
 
Each container shall be legibly and indelibly labelled in Kiswahili and English, and any other language 
as agreed between the manufacturer and supplier with the following information:  
 
a) the name of the product;  
b) registered trade mark if any;  
c) the net content;  
d) the name and address of the manufacturer;  
e) the country of origin;  
f) dates of manufacture and expiry/best before use;  
g) the code number or batch number;  
h) directions for use and safety precaution;  
i) Indication of acidity and alkalinity and  
j) Storage condition  
 
5. Sampling  
The method of drawing representative samples of the material and the criteria for conformity shall be 
as prescribed in Annex A  
 
6. Quality of reagents   
 
Unless specified otherwise, Analytical reagents and distilled water (see TZS 59)  
shall be used in tests.  
 
 
 
 
 
 
 
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Annex A  
 
(Normative)  
 
Sampling of glass cleaner, liquid  
 
A.1 General requirement of sampling  
 
A.1.1 In drawing, preparing, storing and handling of  test samples, the following precautions and 
directions shall be observed.  
A.1.2 Samples shall be taken in a place not exposed to dust or soot.  
A.1.3 The sampling instrument shall be clean and dry when used.  
A.1.4 Precautions shall be taken to protect the samples, the material being sampled, the sampling 
instrument and the containers for samples from adventitious contamination.  
A.1.5 Samples shall be placed in clean, dry and air -tight glass containers or other suitable containers 
on which the material has n o action.  
A.1.6 The sample containers shall be of such size that they are almost completely filled up by the 
sample.  
A.1.7 Each sample container shall be sealed air -tight after filling and marked with full details of 
sampling, the date of sampling and the month and year of manufacture of the material.  
A.1.8 Samples shall be stored in such a manner that the temperature of the material does not vary 
unduly from the normal temperature.  
 
A.2 Scale of sampling  
 
A.2.1 For determining conformity of a consignment to this specification, sample shall be selected so 
as to be representative of the consignment. Samples drawn in compliance with an agreement 
between the purchaser and the manufacturer shall be held to be represe ntative of the consignment. In 
case of dispute, the following scheme is recommended to serve as guide.  
 
A.2.2 Lot - All the containers in a single consignment of the material drawn from the same batch of 
manufacture and of the same size shall constitute a lot. If a consignment is declared or known to 
consist of different batches of manufacture or different sizes of c ontainers, the containers belonging to 
the same batch and size shall be grouped together and each group shall constitute a separate lot. 
Samples shall be tested for each lot for ascertaining conformity of the material to the requirements of 
this specificat ion. 
 
A.3 The number of containers ( n) to be chosen from a lot shall depend upon the size of the lot ( N) and 
shall be in accordance with Table 2.  
 
Table 2: Number of containers to be selected  
 
Lot size  Number of containers to be selected  
N n 
Up to 500  10 
501 to 1 000  15 
1 001 and above  20 
 
A.4 These containers shall be chosen at random from the lot and in order to ensure the randomness 
of selection, a random number table shall be used. In case such tables are not available, the following 
procedure shall be adopted:  
 
Arrange all the containers in the lot in a systematic manner and starting from any container, count 
them as 1, 2, 3, . . . _., up to r and so on, where r is the integral part of N/n. Every rth container thus 
counted shall be withdrawn to  give sample for test.  
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 A.5 Preparation of composite sample  
 
A.5.1 Shake well each of the containers selected according to B -2.3 and pour out quantity of liquid 
such that the total quantity obtained from all the containers provides material sufficient for all the tests 
(about 500 g). Thoroughly mix the material drawn from the selected containers so as to form 
composite sample.  
A.6 Number of tests and criteria for conformity  
 
A.6.1 Tests for all the characteristics shall be done on the composite sample.  
A.6.2 The lot shall be declared as conforming to this specification if the test results satisfy the 
corresponding requirements laid down in this specification.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 Annex B  
 
(Normative)  
 
Test for cleaning efficiency  
 
Procedure   
B.1 To test the cleaning and polishing property of the glass cleaner, it is recommended that both 
sides of the glass panel should be suitably prepared for application of the cleaner.  
 
B.2 Take two panels of clear, plate glass 150 mm x 75 mm x 1.5 mm. Dust them with pulverized clay 
until a thin uniform coating is obtained. Spray a mist coat of water -on each panel to wet the clay and 
allow to dry for 6 hours. Apply a similar coat of clay on the other side of the glass panels. Further 
apply a mis t coat of carbon tetrachloride containing 10 percent mineral oil on both sides of the panels.  
 
B.3 Allow the panels to air dry for 24 h. To one panel, apply the sample by spreading over the surface 
with a rag and immediately wipe off and polish with a cle an cloth. Similarly treat the other side of the 
panel.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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Annex C  
 
(Normative)  
 
Test for corrosion or discolouration  
 
Procedure  
 
Place approximately 3 mL of the sample/cleaner on a cleaned, grease free surface of 75 mm x 50 mm  
x 1 mm aluminium panel and cover with a watch glass.  
 
At the end of 6 hours, remove the watch glass, rinse panel with distilled water and air dry at room 
temperature. Inspect the panel for any attack or discolouration.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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Annex D  
 
(Normative)  
 
Determination of non -volatile matter  
 
D.1 Procedure  
Weigh accurately a 50 g sample of the cleaner into a tared glass beaker and heat on a steam bath to 
dryness. Place the beaker in an oven at 100°C to 105°C and dry to constant mass. (If decomposition 
or discolouration of the solids occurs, carry out the drying in a vacuum oven at 45°C to 50°C.) Report 
the mass of the residue as a percentage by mass of the cleaner.  
 
D.2 Calculation  
 
Non-volatile matter, percent by mass = 𝐵−𝐶
𝐴−𝐶 x 100 
where  
A = mass in g of the sample taken for test and beaker,  
B = mass in g of the beaker and solids after drying, and  
C = mass in g of the beaker.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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