CDC 2(9) DTZS  
 
  ICS 71.100.40  
  
 
 
  
 
 
 
 
DRAFT TA NZANIA STANDARD 
 
 
 
 
 
 
 
 
 
 
 
Tile cleaner s — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TANZANIA BUREAU  OF STANDARDS 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
1st edition  
© TBS 2021 
 
 CDC 13(210) DTZS  
 
   
 
 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.  
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 r etained in the rounded off value should be the same as that of the 
specified value in this standard.   
© TBS  – All rights reserved  1 
 DRAFT TANZANIA STANDARD                         CDC 2(9) DTZS  
Tile cleaner s — Specification   
1. Scope  
This Draft Tanzania Standard specifies requirements, sampling and test methods for tile cleaner s used 
for light and heavy -duty cleaning.  
 
2. Normative references  
The following referenced documents are indispensable for the application of this document. For dated 
references, onl y the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies.  
 
TZS 35  Soaps – Sampling and test methods  
TZS 59, Water for analytical laboratory use — Specification and test method  
TZS 677/ ISO 2271 Surface active agents – Detergents – Determination of anionic -active matter by 
manual or mechanical direct two -phase titration procedure.  
TZS 676/ISO 2871 -1 Surface active agents – Detergents – Determination of cationic -active matter 
content – Part 1 – High molecular -mass cationic -active matter  
TZS 1780/EAS 814 Determination of biodegradability of surfactants — Test method   
 
3. Terms and definitions  
Terms and definition given in TZS 35  shall apply  
 
4. Requirements  
 
4.1 General requirements  
4.1.1  Tile cleaner s shall be of the following types  
a) General purpose tile cleaner s 
b) Acidic tile cleaner s 
4.1.2  The product shall be a homogeneous aqueous liquid.  
4.1.3  The product shall be miscible with water in all proportions.  
4.1.4 The product shall not affect tile surfaces when  used as directed by the manufacturer.  
4.1.5 The active ingredients used shall be biodegradable when tested according to TZS 1780 /EAS 814  
  
© TBS  – All rights reserved  2 
 4.2 Specific requirements  
 
4.2.1  Tile cleaner s shall comply with the specific requirements given in Table 1 when tested in 
accordance with the corresponding test method.  
 
Table 1 ― Specific requirements for general purpose tile cleaner s  
S/N 
 Characteristics  
 Requirements  
 Test method  
i.  Solubility in water  Completely soluble  Annex A  
ii.  Rinsing properties  To pass the test  Annex B 
iii.  Surfactants , % m/m, min  5  
 TZS 677: 2002 / ISO 
2271/ Annex C 
iv.  Total non -detergent organic 
matter, % m/m, max.  0.5 Annex D 
v.  Rust inhibit ion To pass the test  Annex E 
vi.  Biodegradab ility  To pass the test  TZS 1780  
 
 
Table 2  ― Specific requirements for acidic tile  cleaner s  
S/N 
 Characteristics  
 Requirements  Test method  
i.  Solubility in water  Completely soluble  Annex A  
ii.  Rinsing properties  To pass the test  Annex B  
iii.  Surfactants , % m/m, min.  5 
 TZS 677: 
2002 / ISO 
2271/ Annex C  
iv.  Total non -detergent 
organic matter, % m/m, 
max.  0.5 Annex D  
v.  Rust inhibition  To pass the test  Annex E  
vi.  Biodegradability  To pass the test  TZS 1780  
vii.  Total acidity, %, m/m  7 - 12 Annex F  
 
 
5. Packaging, labelling and marking  
5.1 Packaging  
5.1.1  The product shall be packed in suitable containers that are securely closed, impervious to the 
product or shall not be corroded by the product, and shall be sufficiently strong to prevent contamination 
of the product arising from the ordina ry risks of transportation, handling and storage.   
© TBS  – All rights reserved  3 
 5.1.2 The lid or cap on the container shall be such that the product is easily and safely dispensed from 
the container.  
5.2 Labelling  
5.2.1 The labelling shall be either in English  or Kiswahili  or in combination as agreed between the 
manufacturer and the supplier. Any other language shall be optional.  
a) Name and type of product as “general purpose t ile cleaner  or acidic tile cleaner ” 
b) manufacturer’s name and physical address  
 NOTE : The name, physical address of the distributor/supplier and trade mark may be added 
as required  
c) batch or code number;  
d) country of origin  
e) net contents;  
f) instruction s for use; 
g) date of manufacture and best before date;  
h) For acidic tiles the precautionary notice with the following information:  
i) the use of appropriate personal protective equipment  (hand gloves, masks and goggles )  
ii) the word 'CAUTION' shall be in a colour that contrasts with the surrounding for easy visibility 
and shall be followed with the statement, ‘READ LABEL BEFORE  USE';  
iii) the following shall be marked immediately under  name of product : 
• 'Keep Out of Reach of Children';  
• contains acid  (the hazards involved and the necessary storage precautions to be used );  
• that, in case of floor spills, baking soda ash shall be sprinkled over the product and the 
affected area shall be rinsed with water;  
• the product  shall not be used with any other clea ning product;  
• CORROSIVE ACID’ (‘INAWEZA KUCHOMA); followed by the symbol  
, 
 
‘POISON/DANGER’ (‘SUMU/HATARI); followed by a skull and bones,   
© TBS  – All rights reserved  4 
 
 
6. Sampling  
Sampling shall be done in accordance with Annex G 
7. Quality of reagents  
Analytical grade reagents and water for analytical use as specified by TZS 59 shall be used for the 
appropriate tests.   
© TBS  – All rights reserved  5 
 Annex A  
(normative)  
 
Test for solubility  
A.1 Preparation of synthetic hard water  
Weigh to the nearest 0.001 g, about 0.264 g of CaCl 2.2H 2O and 0.295 g of MgSO 4. 2H 2O. Transfer 
quantitatively to a 1 -L volumetric flask; dissolve in a smal l portion of distilled water and make up to the 
mark with distilled water.  
The resulting solution will have a concentration of 8.1 millimole per litre calcium hardness (as CaCO 3). 
A.2 Procedure  
Using a pipette, transfer 5.0 mL of the sample  into a test tube and add sufficient synthetic hard water 
prepared in A.1 to give a volume of 50 mL. Stir vigorously for 5 min, and observe for solubility.  
 
 
 
 
Annex B  
(normative)  
 
Test for rinsing properties  
Dissolve 2.0 mL of the sample  as completely as possible in 98 mL of synthetic hard water (see A.1) at 
ambient temperature, in a clean 250 -mL Erlenmeyer flask. Stopper the flask and stir vigorously for 1 min. 
Pour out the solution. Rinse the flask by the same procedure, using three 75 m L portions of synthetic 
hard water alone. Invert the flask, allow to dry and examine for any residue not rinsed from the interior.  
The flask shall contain no more residues after being dried than a similar allowed drying after rinsing with 
synthetic hard w ater alone.  
 
 
 
 
 
  
© TBS  – All rights reserved  6 
 Annex C  
(informative ) 
 
Methods of test for synthetic detergents  
C.1 Quality of reagents  
Unless otherwise specified, chemicals of analytical grade and water, distilled quality, shall be employed in 
all the tests.  
C.2 Qualitative identification of non -soapy detergents  
C.2.1  General  
It is recommended that the quantitively  examination of a sample is preceded by a qualitative identification 
of the type of non -soapy detergent present. The procedure given in C.2.4 permits asce rtaining whether 
the material is based on soap or a non -soapy detergent. The method described in C.2.5 enables the 
identification of the type of non -soapy detergent, that is, whether it is cationic, anionic or non -ionic.  
C.2.2  Apparatus  
C.2.2.1  Measuring c ylinder,  100 mL capacity; glass -stoppered  
C.2.2.2  Volumetric flask 1 -L   
C.2.2. 3 Tests tubes  
C.2.3  Reagents  
C.2.3.1  Hydrochloric acid , 5 % (m /v) solution  
C.2.3.2  Methyl orange indicator solution , 0.1% (m/v) solution  
C.2.3.3  Methylene blue reagent  — Dissolve 0.5 g of methylene blue in distilled water and make up 
the volume to 100 mL. To 6 mL of this solution, add 120 mL of one mol sulfuric  acid and 50 g of 
anhydrous sodium sulphate, and make up the volume to 1-L volumetric flask  with distill ed water.  
C.2.3.4  Chloroform   
C.2.3.5  Cetyl dimethyl benzyl ammonium chloride solution, 0.2 % (m/v) solution  
C.2.4  Procedure for identification of soapy and non -soapy detergents  
Take about 0.1 g of the sample in a test - tube, add about 20 mL of water and s hake well until dissolution 
is complete. Add a drop of methyl orange indicator solution, and make it just acidic by adding a few drops 
of hydrochloric acid solution. If the lather is destroyed and fatty acids separate out, then the material is 
based on a s oap. If the lather persists, then the active matter is non -soapy detergent.  
C.2.5  Procedure for identification of the type of non-soapy detergents  
C.2.5.1  Dissolve about 0.1 g of the sample in about 20 mL of water, and take 10 mL of the solution in 
a meas uring cylinder. Add 10 mL of methylene blue reagent and 15 mL of chloroform, shake well and 
allow to stand, observe  whether the colour is in the chloroform layer or aqueous layer.   
© TBS  – All rights reserved  7 
 C.2.5.2  If the colour  is initially in the chloroform layer, add 0.1 mL of cetyl dimethyl benzyl ammonium 
chloride solution, and shake well and allow to stand. If the colour is regained in the chloroform layer, the 
active matter is anionic. If the colour is transferred to the a queous layer, the active matter is non -ionic.  
C.2.5.3  If the colour is initially in the aqueous layer, add 0.1 mL of sodium lauryl sulphate solution, 
and shake well and allow to stand. If the colour is retained in the aqueous layer, the active matter is  
cationic. If the colour is transferred to the chloroform layer, the active matter is non -ionic.  
C.3 Quantitative identification of active ingredient  
This shall be carried according to ISO 2271.  
  
© TBS  – All rights reserved  8 
 Annex D 
(normative)  
 
Determination of non-detergent organic matter  
D.1 General  
The term non -detergent organic matter includes hydrocarbons, fatty alcohols and perfumes. Using 
petroleum ether and under the conditions prescribed, non -detergent organic matter only is extracted 
leaving any alkylam ide present in the material.  
D.2 Apparatus  
D.2.1 Evaporating basin  
D.2.2 Separating funnels , 1 000 -mL capacity.  
D.2.3 Wide mouthed flat -bottomed flask , 200 -mL capacity  
D.2.4 Quick fit b uchner flask , 500 -mL capacity, fitted with a sintered glass filter funn el (porosity 4)  
D.3 Reagents  
D.3.1 Ethyl alcohol, 50 %, 70 %. 90 % and 96%  (by volume)  
D.3.2 Petroleum ether,  boiling range 40 °C to 60 °C non -volatile residue at 80 °C maximum 0.001%  
D.3.3 Acetone,  non-volatile residue at 80 °C maximum 0.001 %  
D.4 Procedure  
D.4.1 For the removal of inorganic salts , weigh accurately about 5 g of the material in a 150 -mL squat 
beaker. Extract with 50 mL of hot 90 % ethanol by heating on the steam bath for about 2 min stirring and 
breaking up any hard lumps with a glass rod flattened at the end.  
Allow the solid matter to settle and decant the hot alcoholic  solution through a sintered glass filter funnel 
(porosity 4) fitted to a 500 -mL Buchner flask to which suction is applied. Repeat the extraction in a similar 
manner with five further consecutive 30 -mL quantities of boiling 90 % ethanol. Pass each extract in turn 
through th e filter into the flask.  
D.4.2 Transfer quantitatively all the combined filtrate from the Buchner flask to a 1 -L separating funnel 
and rinse the flask four times with 40 -mL quantities of distilled water, transferring each wash in turn to the 
separating fun nel. Add 100 mL of petroleum ether, swirl gently to ensure adequate mixing and allow the 
two phases to separate. Run off the aqueous alcoholic layer into a second separating funnel, and extract 
with 75 mL of petroleum ether. Repeat the extraction of the aq ueous alcoholic phase in the third 
separating funnel with a further 75 mL of petroleum ether. Combine the three ether extracts in the first 
separating funnel. Rinse each of the two empty funnels with a few millilitres petroleum ether and add the 
rinsing to  the combined ether extracts.  
D.4.3 Wash the combined ether extracts and rinsing (see D.4.2) with four successive 50 -mL portions of 
70 % ethyl alcohol, shaking and removing the alcoholic phase each time. Transfer the ether layer in 
stages to a tared flask and evaporate off the solvent. Add 10 mL of acetone and evaporate off the solvent. 
Rotate the flask on a steam bath during the operation. Cool the flask to about 60 °C to 65 °C, gently blow 
out the last traces of solvent with a current of dry air, cool in a desiccator and weigh.   
© TBS  – All rights reserved  9 
 D.5 Calculation  
The non - detergent organic matter shall be expressed as follows:  
Non- detergent organic matter, %, by mass = 
mm1100  
where  
m1 is the mass, in grams, of the non -detergent organic matter in the flask; and  
m is the mass, in grams, of the material taken for the test.  
 
 
 
 
  
  
© TBS  – All rights reserved  10 
 Annex E 
(Normative)  
Method for assessing rust inhibition  
 
E.1 Apparatus  
E.1.1 Squat and tall 1 -L Pyrex glass beakers  
E.1.2 Oven , capable of maintaining 105 °C ± 2 °C  
E.1.3 Test panel,  made of stainless steel, of approximate dimensions 125 mm x 63 mm x 1.5 mm. The 
panels shall have a cold -rolled finish on both faces. They shall be undamaged and unmarked, flat and 
with their edges free from burrs.  
E.1.4 Stainless steel tongs,  for handling the panels  
E.1.5 Panel bolders , made of inert material such as polypropylene for use during pre -cleaning and 
drying operations  
E.1.6 Rubber bands , of rectangular cross -section, measuring when lying flat and unstretched, 
approximately 80 mm x 6 mm  
E.1.7 Magnesium carbonate (technical),  for use as an abrasive in cleaning panels  
E.1.8 Distilled water  
E.1.9 Watch glass, l arge enough to cover the tall 1 -L beakers in E.1.1 
E.2 Pre-cleaning of test panels and rubber bands  
E.2.1 Panels  
E.2.1.1  Swab the test panels, two for each test, with cotton wool using a warm 1 % v/v solution of a 
general -purpose detergent.  
E.2.1.2  Scour the panels with cotton wool using water as a lubricant and the magnesium carbonate 
as an abrasive.  
NOTE  Scouring also removes any films produced by reaction between the detergent and the 
abrasive, for example, magnesium silicate.  
E.2.1.3  Without delay, thoroughly rinse the panels under hot tap water, ensuring that all of the 
magnesium carbonate is removed.  
E.2.1.4  Then, rinse the panels in boiling, distilled water immersing each panel in turn in water 
contained in three 1 -L beakers.  
E.2.1.5  Dry in an oven at 105 °C ± 2 °C.  
E.2.1.6  Allow to cool in a dry, dust -free position.   
© TBS  – All rights reserved  11 
 E.2.2 Rubber bands  
E.2.2.1 Place the rubber bands in a hard -boiling 1 % v/v solution of a general cleaning detergent for 
10 min.  
E.2.2.2  Rinse under hot tap water.  
E.2.2.3  Then rinse in distilled water and allow to dry.  
E.3 Procedure  
E.3.1 The procedure shall be carried out in du plicate in accordance with E.3.2 – E.3.9. 
E.3.2 In a 1 -L beaker, make up 950 mL of the sample  dilution under test. Make up to the mark.   
E.3.3 Place two rubber bands around each test panel in the direction of the long axis of the panel, 
ensuring that the bands are flat against both sides of the panel and that the panel is not touched by the 
fingers.  
E.3.4 Five minutes after placement of the bands, immerse the panels on their ends as upright as 
possible in the test solution, so that there is at least 10  mm of solution above the panels. Note the time. 
Place the watch glasses on the beaker.  
E.3.5 Leave the panels in the test solution for 72 h.  Each morning and evening, top up the solution to 
the mark with distilled water.  
E.3.6 At the end of 72 h remove t he panels from the test solution, remove the bands and rinse the 
panels under hot, running water.  
E.3.7 Then rinse three times as prescribed in C.2.1.4 . 
E.3.8 Finally, dry the panels in the oven at 105 °C ± 2 °C.  
E.3.9 Examine the panels for:  
a. evidence of corrosion, and  
b. discolouration.  
NOTE  Pitting is most likely to occur where the rubber band contacts the edges of the panel.  
E.4 Interpretation of results  
If the duplicate panels from the test detergents show the same characteristics, record the results. If the 
duplicates differ, repeat the test using fresh panels.  
E.5 Report  
The product shall be deemed to contain an effective rust inhibitor if no visible corrosion or discolouration 
of the panels has occurred.  
 
 
 
  
© TBS  – All rights reserved  12 
  
Annex  F 
(normative)  
 
Determination of acidity  
Accurately weigh 10 g of sample in a 250 -mL Erlenmeyer flask and add 25 mL of distilled water. Add 
approximately 15 mL of 5 % aqueous calcium acetate solution and warm contents to 50 °C. Cool and 
filter into beaker.  
Carefully rinse the Erlenmeyer flask precipitate with 3 to 4 aliquots of distilled water collecting all rinsing 
with the filtrate. Titrate the filtrate with standard 1 mol/L NaOH solution.   
Calculate as follows:  
percent acidity = 
sampleof massx NaOHofmLx (mol/L) NaOHofion concentrat C  
where  
C = 3.647 for HCI or 
C = 3.132 for H 3PO 4 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
© TBS  – All rights reserved  13 
 Annex G 
(normative)  
 
Sampling  
G.1 Procedure  
G.1.1 In a single consignment, all packages (cartons) containing tiles cleaner  drawn from the same 
batch of production shall constitute a lot. For ascertaining the conformity of the lot to the requirements of 
this standard, tests shall be carried out on each lot separately. The number of packages to be selected for 
drawing the sampl e shall be in accordance with Table G.1.  
Table G.1 — Scale of sampling  
Number of packages 
(cartons) in the lot  
N Number of packages (cartons) 
to be selected  
n Number of  samples  
4 to 15  3 3 
16 to 40  4 4 
41 to 65  5 2 
66 to 110  7 2 
111 and above  10 1 
 
G.1.2 The packages shall be selected at random, using tables of random numbers. If these are not 
available, the following procedure shall be applied:  
Starting from any package, count all the packages in one order as 1, 2, 3.... N, selecting every      k th 
package, where k is the integral part of N  n.  
G.1.3 From each package thus selected, draw at random an equal number of cakes so as to obtain a 
total mass of at least 2 kg.  
G.2 Preparation of test samples  
G.2.1 Composite sample  
Weigh each cake separately (including any material that may have adhered to the wrapper), and 
calculate the average mass. Cut each of the remaining cakes into eight parts by means of three cuts at 
right angles to each other through the middle. Grate finely  the whole of two diagonally opposite eighths of 
each specimen. Mix the gratings and place in a clean, dry, airtight glass container.  
G.2.2 Samples for testing  
Immediately after preparation of composite sample ( G.2.1), take at one time all test samples re quired for 
the tests in 4.2. Weigh out the test sample required for determination of free alkali or acid content, and 
use it immediately.  
  
© TBS  – All rights reserved  14 
 Bibliography  
TZS 624:2014  Synthetic organic liquid detergent for household use — Specification  
TZS 583 -1:2014  Toilet cleansers ― Specification ― Part 1: Acidic liquid toilet cleansers