QB/T 2485-2023 English PDF (QBT2485-2023)

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QB/T 2485-2023: Toilet soap
QB/T 2485-2023
QB
LIGHT INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.40
CCS Y 43
Replacing QB/T 2485-2008
Toilet soap
香皂
ISSUED ON: APRIL 21, 2023
IMPLEMENTED ON: NOVEMBER 01, 2023
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Classification and marking ... 6
5 Requirements ... 6
6 Test method ... 7
7 Inspection rules ... 10
8 Marking, packaging, transportation, storage ... 11
9 Shelf life ... 11
Appendix A (Normative) Determination of dry sodium soap - Simplified method ... 12
Toilet soap
1 Scope
This document specifies the requirements for soaps; describes the corresponding test
methods; specifies the inspection rules, marking, packaging, transportation, storage and
shelf life; provides classifications for technical provisions.
This document is applicable to the production, inspection, sale of fatty acid salt soaps
produced by milling or other processes, as well as solids made of fatty acid salts with
additional functional agents.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for referenced
documents with dates, only the version corresponding to that date applies to this
document; for referenced documents without dates, the latest version (including all
amendments) applies to this document.
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 13173 Surface active agents - Test methods for detergents
GB/T 24314 Beeswax
GB/T 36970 Instruction for use of consumer products - Labelling for detergents
QB/T 1913-2004 Transparent soaps
QB/T 2623.1 Test methods of soaps - Determination of free caustic alkali content in
soaps
QB/T 2623.2 Test methods of soaps - Determination of total free alkali content in
soaps
QB/T 2623.3 Test methods of soaps - Determination of total alkali content and total
fatty matter content in soaps
QB/T 2623.4 Test methods of soaps - Determination of moisture and volatile matter
content in soaps - Oven method
QB/T 2623.6 Test methods of soaps - Determination of chloride content in soaps
QB/T 2623.8 Test methods of soaps - Determination of phosphate content in soaps
QB/T 2623.9 Test methods of soaps - Determination of total effective matter content
in soaps
QB/T 2739 Preparations of standard volumetric solutions of general test methods
for washing products
QB/T 2951 Inspecting rules for detergent products
QB/T 2952 Requirements for detergent marks and packaging
JF 1070.1 Rules of metrological testing for net quantity of soap products in
prepackages with fixed content
3 Terms and definitions
There are no terms and definitions that need to be defined in this document.
4 Classification and marking
Products are divided into the following categories according to their ingredients:
- Soap type (indicated by type I): Products containing only fatty acid salts and
additives. Marked as "QB/T 2485 type I".
- Compound type (indicated by type II): Products containing fatty acid salts and/or
other surfactants, functional additives, additives. Marked as "QB/T 2485 type II".
5 Requirements
5.1 Sensory requirements
5.1.1 Soap appearance
It shall be uniform in color, without obvious impurities and stains, except for products
with special appearance requirements (such as colored patterns, colored particles, etc.).
5.1.2 Odor
Shall have a stable aroma, without unpleasant odors such as rancid oil.
5.2 Physical and chemical indicators
Shall comply with the requirements of Table 1.
Determine according to QB/T 2623.9; the reported result is calculated according to
formula (2).
The arithmetic mean of the results of 2 parallel determinations is expressed to the
integer as the determination result.
6.7 Moisture and volatile matter
Determine according to QB/T 2623.4.
The reported result of moisture and volatile matter, Y, is expressed in mass fraction and
calculated according to formula (3):
Where:
Y - Reported result of moisture and volatile matter, expressed in percentage (%);
y - Conversion factor;
γ1 - Actually measured result of moisture and volatile matter, expressed in
percentage (%).
The arithmetic mean of the results of 2 parallel determinations is expressed to the
integer as the determination result.
6.8 Total free alkali
Determine according to QB/T 2623.2.
If the ethanol-soluble substance does not make the phenolphthalein indicator solution
appear pink, it is considered that the total free alkali in the ethanol-soluble substance
has not been detected; the titration operation can be stopped. If the color of the colored
soap interferes with the endpoint of the phenolphthalein indicator solution, thymol blue
indicator solution can be used to indicate the endpoint of the titration.
The reported results are calculated according to formula (2).
The arithmetic mean of the results of 2 parallel determinations is expressed to 2 decimal
places as the determination result.
6.9 Free caustic soda
Determine according to QB/T 2623.1.
If the ethanol solution does not make the phenolphthalein indicator solution appear pink,
it is considered that the free caustic soda in the ethanol solution is not detected and the
titration operation can be stopped. If the color of the colored soap interferes with the
endpoint of the phenolphthalein indicator solution, thymol blue indicator solution can
be used to indicate the endpoint of the titration.
The reported results are calculated according to formula (2).
The arithmetic mean of the results of 2 parallel determinations is expressed to 2 decimal
places as the determination result.
6.10 Chloride
Determine according to QB/T 2623.6.
The reported results are calculated according to formula (2).
The arithmetic mean of the results of 2 parallel determinations shall be expressed to one
decimal place as the determination result.
6.11 Total phosphorus pentoxide
Determine according to QB/T 2623.8 and filter if necessary.
Report the result according to formula (2).
The arithmetic mean of the results of 2 parallel determinations shall be expressed to one
decimal place as the determination result.
6.12 Transparency
After constant temperature at (25 ± 2) °C for 24 hours, determine according to Appendix
A of QB/T 1913-2004.
6.13 Net content
According to JJF 1070.1.
7 Inspection rules
The inspection rules shall be implemented in accordance with QB/T 2951.
Dry sodium soap or total effective matter shall be determined according to the product
type indicated on the package; when the product type is not indicated on the package,
it shall be determined according to "Type I dry sodium soap content ≥ 83%".
The exit-factory inspection items are 5.1, 5.3 and the dry sodium soap content or total
effective matter content, free caustic alkali in Table 1; transparency is added for
transparent products.
Appendix A
(Normative)
Determination of dry sodium soap - Simplified method
A.1 Principle
Soap samples are acidified to generate fatty acids, which are insoluble in water. They
are separated from other inorganic additives in soap. The weight and molecular weight
of fatty acids can be measured, to calculate the dry soap content (content of sodium
fatty acids).
The results of this method include fat matter, average relative molecular mass,
unsaponifiable matter, unsaponifiable oils and fats, and other organic matter insoluble
in water in soap.
A.2 Reagents
A.2.1 95% ethanol: Neutralize with alkali until it is neutral to phenolphthalein indicator
solution.
A.2.2 Sulfuric acid: Aqueous solution with a volume fraction of 1:1.
A.2.3 Sodium hydroxide: c(NaOH) = 0.5 mol/L standard titration solution, prepared
according to the relevant provisions of QB/T 2739.
A.2.4 Methyl orange indicator solution: 1 g/L.
A.2.5 Phenolphthalein indicator solution: 10 g/L.
A.2.6 Semi-refined paraffin: No.60.
A.2.7 Wax block: Take water, semi-refined paraffin (A.2.6) and beeswax (GB/T 24314)
in an aluminum pot in a weight ratio of about 10:4:1; place on an electric stove and heat
until slightly boiling. Pour the wax block into a porcelain plate to make a cake; cool it;
take out the wax block and dry it; cut it into pieces, so that each piece is about 7 g.
A.3 Instruments
A.3.1 Analytical balance: Resolution 0.0002 g.
A.3.2 Beaker: 50 mL, 250 mL.
A.3.3 Conical flask: 250 mL.
A.3.4 Measuring cylinder: 10 mL.
A.3.5 Burette without stopper (B grade): 25 mL.
A.3.6 Watch glass: φ(85 ± 5) mm.
A.3.7 Oven: Can be controlled at (103 ± 2) °C.
A.3.8 Boiling water bath.
A.4 Steps
A.4.1 Determination of total fatty acids
Weigh about 10 g of the test portion (6.2) (weighed to 0.001 g) and the homemade wax
block (A.2.7) (weighed to 0.001 g), respectively. Place the test portion in a 250 mL
beaker. Insert a glass rod.
Add 200 mL of water at about 50 °C to the beaker; place it in a boiling water bath (A.3.8)
and heat until the sample is dissolved. Measure 10 mL of sulfuric acid (A.2.2) (If
necessary, add more sulfuric acid to fully acidify the sample). Slowly add it to the
beaker while stirring. Start timing after stirring evenly; add a wax block (A.2.7) of
known weight after the fatty acids are clarified. After 1 hour, take out the beaker and
put it in a water tank to cool (if there are bubbles in the fatty acid, it must be heated and
dissolved again until the bubbles are driven away).
Take out the mixed wax block; absorb the water with filter paper; use a knife to scrape
the mixed wax on the beaker wall and the glass rod; place it on the analytical balance
to weigh (accurate to 0.001 g).
The soap shall not be placed in a boiling water bath for too long for heating and
decomposition; the test shall be completed within 2 hours.
For some soaps with inorganic substances, about 2 g of sodium fluoride can be added
during the test to ensure that the surface of the mixed wax cake is firm. The total fatty
acid content W, expressed as mass fraction, is calculated according to formula (A.1):
W - Total fatty acid content;
m2 - Mass of mixed wax block, in grams (g);
m1 - Mass of wax block, in grams (g);
m0 - Mass of test portion, in grams (g);
A - Correction value (generally not more than 0.5%).