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© TBS 202 1  First Edition 202 1 
CDC 2(8) DTZS  
ICS 71.100.40    
 
 
 
 
 
 
DRAFT TANZANIA STANDARD    
 
 
 
 
Transparent toilet soap — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TANZANIA BUREAU OF STANDARDS    
 
 
   
 
   
 
  
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© TBS 202 1  First Edition 202 1  
 
Foreword  
 
This Draft Tanzania Standard is being prepared by Soaps and detergents Technical 
Committee under the supervision of Chemicals Divisional Standards Committee and it is in 
accordance with the procedures of the Bureau.  
In preparation of this draft standard, assistance was drawn from IS 11303: 2017  Transparent 
toilet soap — specification ; published by Bureau of Indian Standards (BIS).  
For the purpose of deciding whether a particular requirement of this standard is complied 
with, the final value observed or calculated expressing the result (s) of a test or analysis shall, 
be rounded off in accordance with TZS 4. The number of significant places retained in the 
rounded off value should be the same as that of the specified value in this standard.  
 
   
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© TBS 202 1  First Edition 202 1 DRAFT TANZANIA STANDARD                                                                     CDC 2 ( 8) DTZS   
 
Transparent  toilet soap – Specification  
 
 
1 Scope  
 
This Draft Tanzania Standard prescribes requirements and test methods for transparent  toilet soap  
suitable for body hygiene .  
 
2 Normative r eferences  
 
The following referenced documents are indispensable for the application of this document; the latest 
edition of the referenced document (including any amendments) applies.  
 
TZS 4 , Rounding off numerical values  
TZS 35 , Soaps – Sampling and test methods  
TZS 638  (1-5)/ EAS 377 (1 -5), Cosmetics and cosmetic products — Part 1 to 5  
TZS 2102 /EAS 974 , Determination of the microbial inhibition of cosmetic soap bars and liquid 
hand and body washes - Test method  
TZS 1780 /EAS 814, Determination of biodegradability of surfactants – Test method  
TZS 1396 -8.2/ISO 457, Soaps — Determination of chloride content — Titrimetric method  
TZS 1396 -4/ISO 456,  Surface active agents — Analysis of soaps — Determination of free caustic 
alkali  
TZS 1396 -6/ISO 685 Analysis of Soaps – Determination of total alkali content and total fatty 
matter content  
TZS 1396 -9/ISO 1067, Analysis of soap — Determination of unsaponifiable, unsaponified and 
unsaponified saponfiable matter  
ISO 457  Soaps — Determination of chloride content — Titrimetric method
 
3 Terms and definition  
For the purpose of this Draft Tanzania Standard, the definitions given in TZS 35 (see clause 2) and the 
following shall apply.  
 
Transparent toilet  soap  
hot process soap that uses solvents (sugar, glycerine and alcohol) to dissolve the soap crystals that 
allow light to pass, therefore creating transparency   
 
4 Requirements  
 
4.1 General requirements  
 
4.1.1 Transparent toilet  soap shall be transparent, having good lathering and cleansing properties  and 
shall not cause skin irritation . 
4.1.2 Transparent toilet soap shall be firm and of uniform texture and shall be  free from objectionable 
(disagreeable) odour.  
4.1.3 All the substances used in  bathing soap shall comply with the requirements of all parts of TZS 
638.  
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© TBS 202 1  First Edition 202 1 4.1.4 An antibacterial transparent  toilet soap  shall pass the antibacterial activity test when determined 
by the method given in TZS 2102 /EAS  974 
4.1.5 The active ingredients used shall be biodegradable when tested according to TZS 1780  
4.2 Specific requirements  
 
Transparent toilet soap shall comply with the specific requirements specified in Table 1  below.  
 
Table 1 – Specific r equirements for Transparent toilet  soap  
S/n Characteristic  Requirement  Method of test  
i.  Total fatty matter, %   by mass, min 60 TZS 1396 -6/ 
ISO 685 . 
ii.  Free    caustic alkali (as NaOH /KOH/ ), % by mass, max 0.05 TZS 1396 -4/ 
ISO 456    
iii.  Chlorides, % by mass, max 1.3 TZS 1396 -
8.2/ISO 457  
iv.  Unsaponified fatty matter content, % by mass, max  0.5 TZS 1396 -9/ 
ISO 1067   
v.  Transparen cy To pass the  test Annex A  
 
Calculation and expression of results  
 
Cake soaps are liable to lose moisture on keeping. The result of analysis with respect to free caustic 
alkali, in relation to the minimum specified total fatty matter is given by equation;  
 
 
matterfatty  total actualmatterfatty  total specified minimum  result  actualresult Corrected=
 
 
5 Packaging and labelling  
 
5.1 Packaging  
 
Transparent  toilet soaps shall be packed in suitable materials that will not allow loss of important 
active ingredients, damage of the product or its contamination.  
 
5.2 Labelling  
 
Each package shall be legibly and indelibly labelled either in English or Kiswahili or combination or 
any other language as agreed between the manufacturer and supplier with the following information  
 
a) Name of product as  “transparent  toilet soap”;  
b) name and address of the manufacturer ; 
c) batch number or lot number;  
d) net content;  
e) country of origin;  
f) antibacterial agent(s) used (for antibacterial transparent toilet soap);  
g) list of ingredients in descending order of quantity; and  
h) date of manufacture and best before date.  
 
6 Sampling  
 
For the purpose of this Tanzania Standard, general precaution, scale of sampling and preparation of 
test samples shall be done as prescribed in TZS 35 (see clause 2).  
 
7 Testing 
 
Tests shall be carried out accordin g to the methods prescribed in this standard .  
 
 
 
 
Annex A  
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© TBS 202 1  First Edition 202 1 (Normative)  
 
Method of Test for Transparency  
 
 
 
Transparency of transparent toilet soap  
 
Procedure  
When a tablet of transparent toilet soap is held against a fluorescent light , it should  be possible to 
read the stamping on the side opposite  to the viewer . 
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© TBS 202 1  First Edition 202 1  