QB/T 2485-2008 English PDF (QBT2485-2008)
QB/T 2485-2008 English PDF (QBT2485-2008)
QB/T 2485-2008: Toilet soap
LIGHT INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
Classification No.: Y43
Record No.: 24061-2008
Replacing QB/T 2485-2000
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
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.
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).
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
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.
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.
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).
Determination of Dry Sodium Soap – Simplified Method
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.
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.3.1 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).