GB 31604.4-2016 PDF English

GB31604.4-2016: PDF in English

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 .......
Source: https://www.ChineseStandard.net/PDF.aspx/GB31604.4-2016