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QB/T 2485-2008 (QB/T2485-2008)

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Newer version: QB/T 2485-2023

QB/T 2485-2008: PDF in English (QBT 2485-2008)

QB/T 2485-2008
LIGHT INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.40
Classification No.: Y43
Record No.: 24061-2008
Replacing QB/T 2485-2000
Toilet Soap
香皂
ISSUED ON: MARCH 12, 2008
IMPLEMENTED ON: SEPTEMBER 01, 2008
Issued by: National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Product Classification and Marking ... 6
4 Requirements ... 6
5 Test Methods ... 7
6 Inspection Rules ... 10
7 Marking, Packaging, Transportation, Storage, Shelf Life ... 10
Appendix A (Normative) Determination of Transparency ... 11
Appendix B (Informative) Determination of Dry Sodium Soap – Simplified
Method ... 14
Toilet Soap
1 Scope
This Standard specifies product classification, requirements, test methods, inspection
rules and marking, packaging, transportation, storage and shelf life of toilet soap.
This Standard is applicable to the fatty acid sodium soap produced by the rolling and
the cooling forming processes; and the bulk soap, medicated soap, crystal soap, etc.
mainly made of sodium fatty acid, added with other surfactants, functional additives,
and assistants.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
QB/T 2487-2008 Compound Laundry Bar Soap
QB/T 2623.1-2003 Test Methods of Soaps - Determination of Free Caustic Alkali
Content in Soaps (eqv ISO 456:1973)
QB/T 2623.2-2003 Test Methods of Soaps - Determination of Total Free Alkali
Content in Soaps (eqv ISO 684:1974)
QB/T 2623.3-2003 Test Methods of Soaps - Determination of Total Alkali Content
and Total Fatty Matter Content in Soaps (eqv ISO 685:1975)
QB/T 2623.4-2003 Test Methods of Soaps - Determination of Moisture and Volatile
Matter Content in Soaps - Oven Method (eqv ISO 672:1978)
QB/T 2623.6-2003 Test Methods of Soaps - Determination of Chloride Content in
Soaps - Titrimetric Method (eqv ISO 457:1983)
QB/T 2623.8-2003 Test Methods of Soaps - Determination of Phosphate Content
in Soaps
QB/T 2739-2005 Preparations of Standard Volumetric Solutions of General Test
into eight parts through the middle of each soap; and take two diagonal parts to cut
into thin slices or mashed; fully mixed; and put in a clean, dry, sealed container for
later-use.
5.2 Sensory indicators
5.2.1 Appearance of packaging and soap body
Visually examine by sense.
5.2.2 Odor
Inspect by smelling.
5.3 Dry sodium soap
5.3.1 Arbitration method
Test according to QB/T 2623.3-2003. The report result of dry sodium soap (%) is
expressed by an arithmetic mean to the integer unit; it shall be converted as per the
Formula (1).
……………….. (1)
If the color of the colored soap interferes with the end point of the phenolphthalein
indicator solution, thymol blue indicator solution may be used to indicate the end point.
During the measurement, 30 mL of c(1/2H2SO4) = 4mol/L sulfuric acid aqueous
solution may be added to acidify the sample. If necessary, ensure that the temperature
of the acidified solution is no lower than 70°C.
5.3.2 Simplified method
Determine according to Appendix B. The report result (%) of dry sodium soap is
expressed by an arithmetic mean to an integer unit; and it shall be converted by
Formula (1).
5.4 Total effective substance
Determine according to Appendix A of QB/T 2487-2008. The report result (%) of the
total effective substance is expressed by an arithmetic average to an integer unit; and
it shall be converted by the Formula (1).
5.5 Moisture and volatile
Determine according to QB/T 2623.4-2003. The report result (%) of moisture and
volatile is expressed by an arithmetic mean to an integer unit; and it shall be converted
When the soap is packaged in small pack, then the inspection of net content, sampling
method and determination rules shall be in accordance with the provisions of JJF 1070-
2005.
6 Inspection Rules
6.1 Inspection rules shall be in accordance with the provisions of QB/T 2951.
6.2 The dry sodium soap or total effective substance shall be determined according to
the product type indicated on the packaging; when the product type is not indicated on
the packaging, it shall be determined according to "Type-I, dry sodium soap content
≥83%".
6.3 The exit-factory inspection items are 4.1, 4.3 and Table 1 in 4.2, which contains the
content of dry sodium soap content or the total effective substance content, and the
free caustic alkali content; it also adds transparency to transparent products.
7 Marking, Packaging, Transportation, Storage, Shelf
Life
7.1 Marking and packaging
The type of product shall be indicated on the outer packaging of the sales. Others are
in accordance with the provisions of QB/T 2952.
7.2 Transportation
The product shall be lightly loaded/unloaded during transportation to avoid sun and
rain, and it is strictly prohibited to trample and stack heavy objects on the box.
7.3 Storage
The product shall be stored in a place for anti-frost, ventilated and dry, and protected
from direct sunlight and rain. The stacking height shall be appropriate to avoid damage
to large packages.
7.4 Shelf life
Under the specified storage conditions, the product is stable for a long time, and the
shelf life may not be marked; if the product meets the requirements of this standard
can only be guaranteed within two years, the shelf life shall be marked.
nicks, and no cracks as a daily whiteboard for measuring whiteness. The working
whiteboard shall be calibrated by a standard whiteboard every month. The working
whiteboard shall be stored in a desiccator in a dark place. If it is contaminated, it must
be wiped clean with velvet cloth or absorbent cotton dipped in absolute ethanol. Then
put it in a drying oven and bake at 105°C ~ 110°C for 30min; take it out; put it in a
desiccator and cool to room temperature; calibrate it with a standard whiteboard; or
process according to the provisions in the instruction manual of the whiteness meter.
A.3.3 Requirements for the whiteness meter
A whiteness meter capable of measuring the transparency of a sample. The optical
geometrical condition of the instrument is diffuse/o-geometry (d/o) or o-
geometry/diffuse (o/d). The light source of the instrument is a D65 light source. The
reading accuracy of the instrument requires one digit after the decimal point. The
stability of the instrument indicates, after start-up and preheating, the reading drift is
no greater than 0.5 every 30min. The accuracy of the instrument shall meet the
requirements of Level-2 or above in the grading standards of the whiteness meter
verification procedure.
NOTE: DN-B whiteness meter is applicable.
A.4 Test procedure
A.4.1 Preparation of test soap tablets
Cut the sample into slices with a thickness of (6.50±0.15) mm; and insert it into the
compression mold to prepare for measurement.
When the monitoring transparency is abnormal in winter, the soap sample may be
placed to return to room temperature (≥18 °C) for 24h or placed in a 25°C thermostat
for 2h for testing and determination.
A.4.2 Determination
Start-up, preheat, and adjust the instrument according to the instruction manual of the
instrument. Determine and record the values of R0 and R∞ of each test soap tablet.
NOTE: If the instrument is equipped with microcomputer or printer, then the values of R0, R∞
and T may be printed directly.
A.4.3 Result and calculation
The transparence T (%) of the transparent soap shall be calculated as per the Formula
(A.1).
Appendix B
(Informative)
Determination of Dry Sodium Soap – Simplified Method
B.1 Scope
This method is only applicable to soap-based soaps using fats and oils as raw
materials. It is not applicable to compound soaps added other surfactants or functional
additives.
B.2 Principle
The soap is acidified to produce fatty acids. The fatty acids are insoluble in water and
separated from other inorganic additives in the soap. After measuring the mass of fatty
acids and the relative molecular mass of fatty acids, calculate the dry soap content
(content of fatty acid sodium).
The determination results of this method include fats in the soap, average relative
molecular mass, unsaponifiable matters, unsaponifiable fats, and other organics that
are insoluble in water.
B.3 Reagents
B.3.1 95% ethanol (GB/T 679), use alkali to neutralize until the indicator solution of
phenolphthalein is neutral.
B.3.2 Sulfuric acid (GB/T 625), (1+1) aqueous solution.
B.3.3 Methyl orange indicator solution, 1g/L.
B.3.4 Phenolphthalein (GB/T 10729) indicator solution, 10g/L.
B.3.5 Sodium hydroxide (GB/T 629), c(NaOH) = 0.5 mol/L standard titration solution;
prepared according to 4.1 in QB/T 2739-2005.
B.3.6 Beeswax (SB/T 10190).
B.3.7 Semi-refined paraffin (GB/T 254), No.60.
B.3.8 Wax block: Take distilled water, semi-refined paraffin wax (B.3.7), and beeswax
(B.3.6) in an aluminum pot in accordance with a mass ratio of about 10: 4: 1; put them
on an electric furnace to heat; slightly boil. After wax blocks are melted and mixed,
pour them into a porcelain dish to make cakes; cool them; take out the wax blocks and
dry them; divide the blocks to make each block about 7g in size.
x – total fatty acid content, in %;
m0 – mass of the test portion, in g;
m1 – mass of the wax block, in g;
m2 – mass of the mixed wax block, in g;
A – corrected value (generally no greater than 0.5%).
NOTE 1: The heating and decomposition time of soap when placing on the water bath should
not be too long. The test shall be completed within 2h.
NOTE 2: For some soaps added with inorganic substances, about 2g of sodium fluoride may
be added during the test to ensure the strong surface of the mixed wax cake.
NOTE 3: This method is not applicable to soaps containing less than 5% fatty acids.
B.5.2 Determination of average relative molecular mass
Take about 20g of the test portion (5.1) in a 250mL beaker; then add about 200mL of
hot distilled water and dissolve it in a water bath (B.4.8).
After dissolving, add excessive sulfuric acid (B.3.2) to acidify; indicate by methyl
orange indicator solution (B.3.3); stir evenly; take off the beaker from the water bath
after the fatty acid is clarified; cool off; after the fatty acid solidifies, discard the acidic
aqueous solution under the fatty acid.
Add hot distilled water to the beaker containing the fatty acid to dissolve and cool the
fatty acid. After the fatty acid solidifies, discard the acidic aqueous solution under the
fatty acid.
Repeat the above operation until the aqueous solution under the fatty acid is neutral
(yellow) against the methyl orange indicator solution.
Pour the washed fatty acid into a 50mL small beaker containing a filter paper; then put
it in (103±2) °C oven (B.4.7) to filter and dehydrate for about 30min; take it out and let
it cool for a while; weight it before solidifying.
Accurately take about 1g (accurate to 0.001g) of the prepared fatty acid in a 250mL
Erlenmeyer flask; add 70mL of neutral ethanol (B.3.1); heat to dissolve; add 2 drops
of phenolphthalein indicator solution (B.3.4); use sodium hydroxide standard titration
solution (B.3.5) to titrate until the solution is light pink (without fading in 30s); then
record the reading V.
The average relative molecular mass of fatty acids (Y) is expressed in grams per mole
(g/mol) and calculated according to Formula (B.2).
......
 
(Above excerpt was released on 2020-04-25, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/QBT2485-2008