                                                                                                                   CDC 3 (12) DTZS  
                                                                                                                           ICS: 71.100.7 0 
 
© TBS 20 21                                                                                                             First Edition 20 21  
 
DRAFT TANZANIA STANDARD  
 
 
 
 
 
 
 
 
Milking jelly  — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TANZANIA BUREAU OF STANDARDS   
ii                                                                                                             ©TBS 20 21 – All rights reserved   
 
Foreword  
 
This Draft Tanzania Standard has been prepared by the Cosmetics and Creameries Technical 
Committee, under the supervision of Chemicals Divisional Standards Committee and it is in accordance 
with the procedures of the Bureau.  
 
This Standard is being prepared to ensure the safety and quality of milking jelly  
(sometimes named as milking salve) used  to lubricate  and moisturizing  a cow’s 
teats when milking . The use of milking jelly prevents the teats from cracking which 
can lead to diseases such as mastitis.  
 
In reporting the result of a test or analysis made in accordance with this Tanzania 
Standard; if the final value, calculated or observed is to be rounded off, it shall be 
done in accordance with TZS 4. 
DRAFT TANZANIA STANDARD                                         CDC 3 (12) DTZS  
                                                                                                                               
©TBS 20 20 – All rights reserved                                                                                                           1  
Milking jelly  — Specification  
 
 
1. Scope  
 
This Draft Tanzania Standard specifies  the requirements , sampling  and test 
method s for milking jelly. 
 
2. Normative references  
 
The following referenced documents are indispensable for the application of this Tanzania Standard . 
For dated references, only the edition cited applies. For undated references, the latest edition of the 
referenced document (including any amendments) appli es:  
 
TZS 59, Water  for analytical laboratory use — Specification and test method  
TZS 768 /ISO 3104  Petroleum products – Transparent and opaque liquids – 
Determination of kinematics viscosity and calculation of dynamic viscosity  
ISO 21150  Cosmetics – Microbiology – Detection of Escherichia coli  
ISO 21149  Cosmetics – Microbiology – Enumeration and detection of aerobic 
mesophilic bacteria  
AOAC 999.10 , Test method for determination of Lead, Cadmium, Zinc, Copper and Iron in foods - 
Atomic absorption spectrophotometry after microwave digestion  
 
3. Terms and definition  
 
 
Milking   jelly  
jelly applied on cow’s teats when milking for lubrication  and m oisturiz ing purposes 
to prevents the teats from cracking  and chapping.  
 
NOTE:    Other names such as milking salve, udder balm, is used interchangeably  CDC 3 (12)  DTZS  
2                                                                                                          ©TBS 2017 – All rights reserved  4. Requirements  
 
4.1 General requirements  
4.1.1 Milking  jelly shall be light-coloured , soft mass, unctuous to touch and shall 
retain these characters on storage.  
 
4.1.2 Milking  jelly shall be tasteless and odourless.  
 
4.2 Specific requirements  
4.2.1  Milking jelly  shall comply with the requirements given in table 1 .  
 
Table 1 – Specific r equirements for milking  jelly  
 
S/No Characteristic  Requirement  Test method  
i.  Kinematic viscosity at 100 °C cSt, 
min 6.8 TZS 768 ,  
ii.  Melting point; °C 36 – 56  Annex B  
iii.  Specific gravity at 60  °C/60  °C 0.815 to 0.880  Annex C  
iv.  Acidity and alkalinity  Neutral  Annex D  
v.  Saponifiable matter  NIL Annex E  
vi.  Organic acids  To pass the test  Annex F  
vii.  Sulfur  and sulfides To pass the test  Annex G 
viii.  Iodine value (Wijs) , max 1.5 Annex H  
ix.  Cone Penetrometer 1/10 , mm  160 -250 Annex I  
x.  Heavy metal (as Pb) mg/kg,  max.  0.02  AOAC 999.10  
 
 
Table 2 Microbial  Analysis  
  
Total plate count  <150 cfu/g  - ISO 21149  
E.coli  Not to be detected - ISO 21150  
 
 
5. Packaging  and labelling  
 
5.1 Pack aging 
The product shall be packaged in suitable well -sealed containers that shall protect the contents and 
shall not cause any contamin ation or react with the product . 
 
5.2 Labelling  
The packages shall be securely closed, legibly and indelibly marked in Kiswahili or English, and any 
other language as agreed between the manufacturer and supplier with the following information:  
 
a) name of the product ;  
b) name and address of manufacturers;  
c) trade mark if any;  
d) net content ; 
e) list of ingredients  
f) batch n umber;  
g) date of manufacture  and best before  date ;                                                                                                          CDC 3 (12) DTZS  
©TBS 20 20 – All rights reserved                                                                                                           3 h) country of origin ; and   
i) instructions for use , storage . 
 
6. Sampling  
For the purpose of deciding whether milking  jelly conforms to the requirements of 
this Tanzania Standard, representative samples shall be collected in accordance with 
Annex K. 
 
7. Test method  
 
Quality of reagents  
Unless specified otherwise, analytical grade reagents  and distilled water as 
described in TZS 59  shall be employed in tests.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 CDC 3 (12)  DTZS  
4                                                                                                          ©TBS 2017 – All rights reserved  Annex  A 
(normative)  
 
Determination of kinematic viscosity  
 
A.1 Outline of the method  
 
A.1.1 The kinematic viscosity is determined by using the viscometers. The specific 
details of operation vary for different types of viscometers.  
 
A.1.2 Procedure  
 
The time is measured for a fixed volume of sample, contained in a glass of viscometer, 
to flow through a calibrated capillary under an accurately reproducible head of liquid 
and at 100 °C. This temperature must be  controlled.  The viscometer selected should 
give an effl ux time greater than 200 s . The kinematic viscosity is calculated from the 
measured efflux time. The viscometer is calibrated by using standard oil having 
viscosi ties established with reference to water in master viscometers or by direct 
comparison with carefully calibrated viscometers. The temperatures of the bath used 
must be maintained within ± 0.01  °C. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                          CDC 3 (12) DTZS  
©TBS 20 20 – All rights reserved                                                                                                           5 Annex  B 
(normative)  
 
Determination of melting point  
 
B.1 Melt a quantity of the sample slowly while stirring until it reaches a temperature 
of 90  °C to 92 °C. Remove the source of heat and allow the molten sample to cool 
to a temperature of 8  °C to 10 °C above the expected melting point. Chill the bulb 
of a thermometer (range 1 °C to 100 °C) to 5 °C, wipe it dry and while it is still cold, 
dip it into molten  sample so that approximately half of the bulb is submerged. 
Withdraw it immediately and hold it vertically away from heat until the wax surface 
dulls, then dip it for five minutes into a water bath having a temperature not higher 
than 16  °C. 
 
B.2 Fix the thermometer prepared in B.1 securely in a test tube so that its lowest 
point is about 15 mm above the bottom of the test tube. Suspend the test tube in 
a water bath adjusted to 16  °C, and raise the temperature of the bath at a rate of 
1 degree/min and note the temperature at which the first drop of the melted 
sample leaves the thermometer. Repeat the determination twice on a freshly 
melted portion of the sample. If the variation in three determinations is less than 
one degree take the average of three as the melting point.  lf the variation in the 
three determinations is more than one degree, make two additional determinations 
and take the average of the five.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 CDC 3 (12)  DTZS  
6                                                                                                          ©TBS 2017 – All rights reserved  Annex  C 
(normative)  
 
Determination of specific gravity  
 
C.1 Apparatus  
 
C.1.1 Specific gravity bottle , 25 m L capacity with a well -fitting ground glass 
stopper with a capillary.  
 
C.1.2 Water bath , maintained at 60  °C ± 1 °C. 
 
C.2 Procedure  
 
C.2.1 Clean and dry the specific gravity bottle, and weigh it. Then fill it with water, 
insert the stopper and immerse in the water bath at 60  °C ± 1  °C. Keep the entire 
bulb completely immersed in water and hold at that temperature for one hour. 
Carefully remove any water which has exuded from the capillary opening. Remove 
from the bath, wipe completely dry, cool to room temperature and weigh.  
 
C.2.2 Melt approximately  40 g of the material in a porcelain dish and fill the dry 
specific gravity bottle with it. Keep the bottle for one hour in a water bath at 60  °C 
± 1 °C. Carefully remove any material which exudes from the capillary opening, 
wipe the bottle dry and cool  at room temperature and weigh.  
 
C.3 Calculation  
                   
Specific gravity 60  °C/60  °C = m1− m2
m3− m3  
 
where  
m1 = mass in grams of specific gravity  bottle with the 
material ,  
 
m2 = mass in grams  of the specific gravity bottle,  and 
 
m3 = mass in grams of the specific gravity bottle with water.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                          CDC 3 (12) DTZS  
©TBS 20 20 – All rights reserved                                                                                                           7 Annex  D 
(normative)  
 
Determination of acidity and alkalinity  
 
D.1 Reagents  
 
D.1.1 Phenolphthalein indicator solution , 1 % solution in 95  % rectified spirit.  
D.1.2 Methylorange indicator,  dissolve 0.01 g of m ethylorange in 100 ml of water.  
 
D.2 Procedure  
Take 35  g of the sample in a 250 m L separating funnel. Add to it 100 m L of boiling 
water and shake vigorously to five minutes. Draw off the separated water layer in 
the beaker. Wash the sample further with two 50 ml portion of boiling water and add 
the washings again to the beaker. To the c ollective washings add one drop of 
phenolph thalein indicator solution and boil. If no pink colour is produced, add 0.1  ml 
of methyl orange indicator and see any re d or pink colour is produced.  
The sample shall be taken to have passed the t est if neither a pink colour is 
produced with phenolphthalein no r a red or pink colour is produced with methyl -
orange.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 CDC 3 (12)  DTZS  
8                                                                                                          ©TBS 2017 – All rights reserved  Annex  E 
(normative)  
 
Determination of saponifiable matter  
 
E.1 Reagents  
E.1.1 Methyl ethyl ketone,  analytical grade, s tored in amber coloured bottle.  
E.1.2 Standard alcoholic  potassium hydroxide solution,  0.5 mo l/L standardized before  
use.  
E.1.3 Petroleum ether,  boiling range 80 °C to 100 °C.  
E.1.4 Standard hydrochloric acid,  0.5 mol/L  accurately  standardized.  
E.1.5 Pheno lphthalein indicator solution,  same as in D .1.1.  
 
E.2 Procedure  
Accurately  weigh in a flask about 5  g of the sample and add 25  mL ± 1 m L of methyl 
ethyl ketone, followed by a standard alcoholic potassium hydroxide solution from a 
burette. Connect the flask to a condenser and heat for half an hour after refluxing 
begins.  Disconnect the condenser, add 50 m L of petroleum ether and titrate the 
solu tion while hot (without heating) with standard hydrochloric acid, using three drops 
of phenolphthalein indicator. When the indicator colour is discharged add three 
drops more of the indicator. If this addition restor es the colour, continue the 
titration. Proceed in this manner until the end point is reached when the indicator 
colour is discarded and does not immediately reappear upon the addition of  three 
more drops of indicator.  
 
The sample shall be taken to have pas sed the requirement prescribed in table 1 
if the blank reading does not differ from the sampl e reading by more than 0.1 m L. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                          CDC 3 (12) DTZS  
©TBS 20 20 – All rights reserved                                                                                                           9 Annex  F 
(normative)  
 
Test for organic acids  
 
F.1 Reagents  
F.1.1 Dilute rectified spirit,  prep ared by diluting 1 volume of 95  % rectified spirit with 2 
volumes of water, and neutralize d to phenolphthalein indicator.  
F.1.2 Phenolphthalein indicator , same as in D.1.1.  
F.1.3 Standard sodium hydroxide solution , exactly 0.1 mol/L . 
 
F.2 Procedure  
Add 100 m L of dilute rectified spirit to 20  g of the sample. Agitate thoroughly and heat 
to boiling. Add 1 m L of phe nolphthalein indicator and titrate rapidly with standard 
sodium hydroxide solution with vigorous agitation to a sharp pink end po int in the 
alcohol wa ter layer.  
The material shall be taken to have passed the test if not more than 0.4 m L of 
standard sodium hydroxide solu tion is required for the titration.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 CDC 3 (12)  DTZS  
10                                                                                                          ©TBS 2017 – All rights reserved  Annex  G 
(normative)  
 
Determination of sulfur  and sulphides  
 
G.1 Reagents  
Copper strips , 1 cm in width, and freshly polished.  
 
G.2 Procedure  
Melt in  a beaker about 100 g of the sample and keep on a water bath at a 
temperature of 95  °C. Then place a strip of copper in the melted sample so that it 
is partially immersed in it and allow to remain for 10 min.  
 
The material shall be taken to have passed the test if the copper strip used in the 
test shows no tarnishing when compared with another freshly polished copper strip.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                          CDC 3 (12) DTZS  
©TBS 20 20 – All rights reserved                                                                                                           11 Annex H 
(normative)  
 
Determination of iodine value  
 
H.1 Outline of the method  
The material is treated with a known excess of iodine monochloride solution in 
glacial acetic acid. The excess of iodine monochloride is determined iodometrically.  
 
H.2 Apparatus  
Thermometer  
An engraved stem thermometer, calibrated between 10 °C and 65 °C  in 0.1degree 
intervals and with the 0 °C point marked on the stem is recommended. The 
thermometer shall have an auxiliary reservoir at the upper end, and a length of about 
370 mm and a diameter of about 6 mm.  
 
H.3 Reagents  
H.3.1 Carbon tetrachloride or chloroform   
H.3.2 Acetic acid  - Glacial acetic acid, 99 %, having a melting point of 14.8°C and 
free from reducing impurities. Determine the melting point of the acetic acid and test 
it for reducing impurities as follows:  
 
a) Melting point determination  
Take a 15 -cm long test tube and fill it to about two thirds with the acetic acid. Insert 
into the acid a thermometer satisfying the requirements specified in H.2 through a 
cork stopper fitting the test tube. The amount of acid should be at least double the  
quantity required to cover the bulb of the thermometer when the bottom of the 
latter is 12 mm from the bottom of the test tube. Suspend this tube within a larger 
test tube through a cork. Cool the acid by immersing the assembly in ice water 
until the temp erature is 10 °C, then withdraw the assembly from the ice water and 
stir the acid rather vigorously for a few moments, thus causing the super -cooled 
liquid to crystallize partially and give a mixture of liquid and solid acid. Take 
thermometer readings ever y 15 s and consider the temperature at which the 
reading remains constant for at least 2 min as the true melting point.  
 
b) Test for reducing impurities  
Potassium permanganate test ;  
Dilute 2 mL of acetic acid with 10 m L of water and add 0.1 m L of 0.5 M potassium 
permanga nate solution and maintain at 27 °C ± 2 °C. The test shall be taken as 
having been satisfied if the pink colour is not discharged at the end of 2 h.  
 
H.3.3 Potassium dichromate,  finely ground.  
H.3.4 Starch solution - Mix 5.0 g of starch and 0. 01 g of mercuric iodide with 30 
mL of cold water and slowly pour it while stirring into 1 L of boiling water. Boil for 3 
min. Allow the solution to cool and decant off the supernatant clear liquid.  
H.3.5 Standard sodium thiosulphate solution , 0.2mol/ L. 
H.3.6 Chlorine gas , dry  
H.3.7 Iodine trichloride  or resublimed Iodine  
H.3.8 Wijs iodine monochloride solution  - Prepare this solution by one of the CDC 3 (12)  DTZS  
12                                                                                                          ©TBS 2017 – All rights reserved  following two methods, and store in a glass -stoppered bottle in a cool place, 
protected from light and sealed with paraffin until taken for use.  
 
a) Dissolve 13 g of re -sublimed iodine in 1 L of acetic acid, using gentle heat if 
necessary, and determine the strength by titration with standard sodium 
thiosulphate solution. Set aside 50 ml to 100 ml of solution and introduce 
washed and dried chlorine gas into the remainder until the characteristic 
colour change occurs and the halogen content is nearly doubled as 
ascertained again by titration. If the hal ogen content has been more than 
doubled, reduce it by adding the requisite quantity of the iodine -acetic acid 
solution. A slightly excess of iodine does not harm, but avoid an excess of 
chlorine.  
 
Example:  If the titration of 20 m L of original iodine acetic acid solution requires 22 m L 
of standard sodium thiosulphate solution then 20 m L of the finished Wijs solution 
require between 43 m L and 44 m L (and not more than 44 m L) of the same sodium 
thiosulphate.  
 
b) As an alternative method of preparing Wijs solution, dissolve 8 g of iodine 
trichloride in approxi mately 450 m L of acetic acid. Dissolve separately 9 g of 
iodine in 450 ml of acetic acid using heat  if necessary. Add gradually the iodine 
solution to the iodine trichloride solution until the colour has changed to reddish -
brown. Add 50 m L more of iodine solution and dilute the mixture with acetic acid 
till 10 ml of the mixture are equivalent to 20 ml standard sodium thiosulphate 
solution when the halogen content i s estimated by titration in the presence of 
an excess to potassium  iodine and water. Heat the solution at 100 °C for 20 
min and cool. Prevent access of water vapour in preparing the solution.  
 
H.4 Procedure  
Melt the material and filter through the filter paper to remove any impurities and the 
last trace of moisture. Make sure that the glass apparatus used is absolutely clean 
and dry. Weigh accurately by difference, about 10 g of the sample, into a clean, dry 
500 m L glass stoppered bottle to which 25 m L of carbon tetrachloride or chloroform 
have been added, and agitate to dissolve the contents. Add 25 m L of Wijs 
solution. (The quantity of Wijs solution added is 50 % - 60 % more than the quantity 
required). Repl ace the glass stopper after wetting with potassium iodine solution, 
swirl for intimate mixing, and allow to stand in the dark for 45 min. Carry out a blank 
test simultaneously under similar experimental conditions. After standing add 15 m L 
of potassium iodide solution and 100 m L of water, and titrate the liberated iodine 
with standard sodium thiosulphate solution, swirling the contents of the bottle 
continuously to avoid any local excess, until the colour of the solution is straw yellow. 
Add 0.5 m L of starch solution and continue the titration until the blue colour 
disappears.  
 
H.5 Calculation  
 
Iodine value =  12.69 (V1− V2)
m  
 
Where,  
V1 = volume in millilitres of standard sodium thiosulphate solution required for the 
blank,                                                                                                           CDC 3 (12) DTZS  
©TBS 20 20 – All rights reserved                                                                                                           13 V2 = volume in millilitres of standard sodium thiosulphate solution  required for the 
material,  
M = Molarity of standard sodium thiosulphate  solution, and  
m = mass in grams of the material taken for the test  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 CDC 3 (12)  DTZS  
14                                                                                                          ©TBS 2017 – All rights reserved  Annex I 
(normative)  
 
Cone Penetrometer 1/10 mm  
 
 
I.1 Procedure  
Fill the sample cup with sample  (make sure there is no porosity ). Keep sample  in the cup  for cooling up 
to 25°C for min 8 hrs. Place the cup on the Penetrometer table.  
Level the machine with leveling screw. Set the mechanism on the ‘Zero’ position and adjust the cone 
tip on the surface of sample at centre of test specimen. Power on the timer panel box and press reset 
button  (It will allow cone to dip for 5.0+/ -0.1 seconds ) then r ead the penetration from the indicator in 
mm.  
 
I.2 Precautions  
Thoroughly clean the penetrometer cone carefully before each test with a soft cloth o r paper wiper ; and 
use only cups that are clean and free from any residue from pervious runs. When the interior plating of 
cup shows the indication of impurity, clean it.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                          CDC 3 (12) DTZS  
©TBS 20 20 – All rights reserved                                                                                                           15 Annex J 
(normative)  
 
Total aerobic microbial count  
 
J.1 Procedure:  
Pre-treat the sample as described below:  
 
J.1.1 Water soluble products:  Dissolve 10 g or dilute 10 m L of the sample preparation being examined 
in sterile Phosphate buffer and adjust the volume to 100 ml with the same mediu m.  
 
J.1.2 Water insoluble products  (non – fatty): Suspend 10 g or 10 m L of the sample preparation being 
examined in sterile Phosphate buffer medium and dilute to 100 m L with the same. Homogenize the 
suspension. In case of poorly wet table substances a sui table surface active agent such as 0.1 % w/v 
Polysorbate 80 is added to assist formation of suspension e.g. In case of Talc, Magnesium Stearate, 
Carbopol.  
 
J.1.3 Fatty Products: Homogenise 10 g or 10 m L of the sample preparation being examined with 5 gm 
of Polysorbate 20 or Polysorbate 80. Add 85 m L of Phosphate buffer and mix. If required heat to not 
more than 40 °C and maintain this temperature for the shortest time necessary for Plate count  
 
J.2 Procedure  
J.2.1 For bacteria:  Pipette out 1 m L of the pre -treated preparation in each of the two sterile petri plates 
and bulk seed with about 15 m L of liquefied sterile Soya bean casein digest agar at not more than         
45 °C. Incubate the Petri plates at 37  °C ±1 for 24 to 48 hrs . A negative control should be run along with 
the test sample. After incubation, count the number of colonies formed. Calculate the results using 
plates.  
 
J.2.2 For fungi : Proceed as described in test for bacteria but use sterile Sabouraud Dextrose Agar/ 
Potato Dextrose Agar in place of Soya bean casein digest agar. Incubate the plates at 20  °C– 25 °C for 
5 days. A negative control should be run along with the test sample. formation of an emulsion and in 
any case for not more than 30 min.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 CDC 3 (12)  DTZS  
16                                                                                                          ©TBS 2017 – All rights reserved  Annex K 
(Normative)  
 
Sampling of petroleum jelly  
 
K.1 General requirements of sampling  
In drawing, preparing, storing and handling test samples , the following precautions and directions  
shall be observed.  
 
K.1.1 Samples shall not be taken in an exposed place.  
K.1.2 The sampling instrument shall be clean and dry.  
K.1.3 Precaution shall be taken to protect the samples, the materials being sampled, the sampling  
instrument and the containers or samples from adventitious contamination.  
K.1.4 To draw representative sample, the content of each container selected for sampling shall be  
mixed as thoroughly as possible by suitable means.  
K.1.5 The samples shall be kept in clean dry airtight glass or other suitable containers.  
K.1.6 The sample container s shall be of such a size that they are almost completely filled by the  
sample.  
K.1.7 Each sample container shall be sealed airtight with a suitable stopper after filling, and marked  
with full details of sampling, the date of sampling and the year of manuf acture of the material.  
 
K.2 Scale of sampling  
K.2.1 Lot, all the containers in a single consignment of the material drawn from a single batch of  
manufacture shall constitute a lot. If a consignment is declared or known to consist of different  
batches of manufacture, the containers belonging to the same batch shall be grouped together and  
each such group shall constitute a separate lot.  
K.2.2 Samples shall be tested from each lot for ascertaining conformity of the material to the  
requirement of this specification  
K.2.3 The number of containers ( n) to be chosen from the lot shall depend on the size of the lot ( N) 
and shall be as given in Table 2.  
K.2.4 The containers to be selected for sampling shall be chosen at random from the lot and for this  
purpose, random number tables shall be used. In case such tables are not available, the following  
procedure may be adopted.  Starting from any container count 1, 2, 3 r and so on in a systematic manner, 
where  r is the integral part of N/n Every rth container thus counted shall be withdrawn from the lot.  
 
Table 2 — Number of containers to be selected for sampling ( K.2.3) 
Lot size  
N Number of containers to be selected  
n 
3 to 50  3 
51 to 200  4 
201 to 400  5 
401 to 650  6 
Greater than 650  7 
 
 
 
K.3 Test samples and referee sample  
K.3.1 Preparation of test samples  
K.3.1.1 Draw with an appropriate sampling instrument a small portion of the material from  
different pans of each container selected (see Table 2). The total quantity of the material drawn fr om                                                                                                          CDC 3 (12) DTZS  
©TBS 20 20 – All rights reserved                                                                                                           17 each container shall be sufficient to conduct the tests for all the characteristics given in Clause 4 and 
shall not be less than 250 g.  
K.3.1.2 Thoroughly mix all portions of the material drawn from the same container. Out of these  
portions, equal quantities shall be taken from each selected container and shall be well mixed up  
together so as to form a composite sample weighing not less than 0.5 kg. This composite sample  
shall be divided into three equal parts, one for the purchaser and the supplier  and shall be used in  
case of dispute between the two.  
 
K.4 Number of tests  
Tests for all the characteristics given in Table 1 shall be conducted on the composite sample.  
 
K.5 Criteria for conformity'  
A lot shall be declared as conforming to this specification if the composite sample satisfies the  
requirements for each of the characteristics listed in Table 1. If the requirements for any of the  
characteristics are not met; the lot shall be declared to have not satisfied the requirements of the  
specification. 
  
Bibliography  
 
EAS 126:1999  Pure petroleum jelly for cosmetics industry — Specification  
 
TZS 318 -1: 2017 Petroleum jelly for cosmetic industry – Part 1: Specification  