GB 31604.7-2023 English PDF (GB31604.7-2023)

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GB 31604.7-2023: National food safety standard - Food contact materials and products - Decolorization test
GB 31604.7-2023. National food safety standard decolorization test of food contact materials and products
National Standards of People's Republic of China
National food safety standards
Decolorization test of food contact materials and products
Published on 2023-09-06
Implemented on 2024-03-06
National Health Commission of the People's Republic of China
Released by the State Administration for Market Regulation
Preface
This standard replaces GB 31604.7-2016 "National Food Safety Standard for Decolorization Test of Food Contact Materials and Products".
Compared with GB 31604.7-2016, the main changes in this standard are as follows.
---Modified the scope;
---Modified the principle;
---Added reagents and materials;
---Added instruments and equipment;
---Modified the analysis steps;
---Modified the result expression.
National food safety standards
Decolorization test of food contact materials and products
1 Scope
This standard specifies the test methods for discoloration of plastic materials and products used in food contact.
This standard is applicable to the determination of coloration and wiping decolorization of food-contact plastic materials and products soaked with colorants.
2 Principles
The decolorization test is divided into two parts. soaking liquid coloring and wiping decolorization. The soaking liquid coloring uses food simulants or chemicals obtained from the migration test.
Use a scientific alternative solvent, and use a gray sample card or a six-color nine-level card to evaluate the coloring grade of the immersion solution. Wipe and decolorize using food simulants
Moisten saturated absorbent cotton, wipe the food contact surface of the sample, use the gray sample card or the six-color nine-level card to evaluate the staining, wipe it and then degrease it.
Cotton coloring grade.
3 Reagents and materials
Unless otherwise stated, the reagents used in this method are of analytical grade and the water is secondary water specified in GB/T 6682.
3.1 Reagents
3.1.1 Glacial acetic acid (C2H4O2).
3.1.2 Absolute ethanol (C2H6O).
3.1.3 Isooctane (C8H18).
3.1.4 95% ethanol.
3.1.5 Vegetable oil (olive oil, corn oil). complies with the requirements of GB 5009.156.
3.1.6 Coconut oil (CAS number. 8001-31-8). chemically pure.
3.2 Reagent preparation
Food simulants. Prepared in accordance with the provisions of GB 5009.156.
3.3 Materials
3.3.1 Absorbent cotton. white.
3.3.2 Gray sample card for staining assessment. Gray sample card for staining assessment that meets the requirements of GB/T 251 (see Figure A.1 in Appendix A).
3.3.3 Six-color nine-level card. A six-color nine-level card that meets the standards of the American Association of Textile Chemists and Printers and Colorists (AATCC) (see Appendix A
Figure A.2).
3.3.4 Colorimetric tube with stopper. 50mL, colorless, only full and half volume colorless scale marks.
4 Instruments and Equipment
4.1 Electronic balance. sensitivity is 0.1g (maximum weighing capacity >2.0kg).