GB 31604.4-2016 English PDF

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GB 31604.4-2016: National Food Safety Standard -- Food Contact Materials and Articles -- Determination of volatiles in resins
GB 31604.4-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard –
Food Contact Materials and Products –
Determination of Volatile Substances in Resin
ISSUED ON. AUGUST 31, 2016
IMPLEMENTED ON. MARCH 1, 2017
Issued by. National Health and Family Planning Commission of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Principle ... 4
3 Reagents and Materials ... 4
4 Apparatus ... 4
5 Analytical Procedures ... 4
6 Expression of Analytical Results ... 5
7 Precision ... 6
National Food Safety Standard –
Food Contact Materials and Products –
Determination of Volatile Substances in Resin
1 Scope
This Standard specifies the determination of volatile substances in resin of food contact
materials and products.
This Standard is applicable to the determination of volatile substances in polystyrene
resin of food contact materials and products.
2 Principle
At 138°C~140°C, under 85.3kPa, the loss weight of specimen after drying for 2h minus
the mass of drying loss weight is the mass of the volatile substances.
3 Reagents and Materials
Butanone (C4H8O).
4 Apparatus
4.1 Balance. sensibility of 0.1mg.
4.2 Ultrasonic cleaning device. operating frequency of 35kHz.
4.3 Vacuum drying oven.
5 Analytical Procedures
5.1 Sampling method
Operate as per GB 5009.156.
5.2 Drying weight loss