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GB 31604.5-2016 PDF English


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GB 31604.5-2016: PDF in English

GB 31604.5-2016 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National Food Safety Standard – Food Contact Materials and Products – Determination of Extract 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 (Extracting Solution) ... 4 4 Apparatus ... 5 5 Analytical Procedures ... 5 6 Expression of Analytical Results ... 6 7 Precision ... 7 Foreword This Standard replaced the determination of normal hexane extract in GB/T 5009.58- 2003 Method for Analysis of Hygienic Standard of Polyethylene Resin for Food Packaging; and GB/T 5009.59-2003 Method for Analysis of Hygienic Standard of Polystyrene Resin for Food Packaging, GB/T 5009.71-2003 Method for Analysis of Hygienic Standard of Polypropyrene Resin for Food Packing; as well as the determination of extract in GB/T 5009.99-2003 Method for Analysis of Hygienic Standard of Polycarbonate Resin Used as Food Containers and Packagin, GB 13114- 1991 Hygienic Standardfor Polyethylene Terephthalate Resin Used as Food Containers and Packaging Materials. Compared with GB/T5009.58-2003, GB/T 5009.59-2003, GB/T 5009.71-2003, GB/T 5009.99-2003, GB 13114-1991, this Standard has the major changes as follows. --- Modify the standard name into “National Food Safety Standard – Food Contact Materials and Products – Determination of Extract in Resin”; ---Modify the standard scope; --- Modify the determination method. National Food Safety Standard – Food Contact Materials and Products – Determination of Extract in Resin 1 Scope This Standard specifies the determination of extract in resin of food contact materials and products. This Standard is applicable to the determination of extract in polyethylene, polystyrene, polypropyrene, polycarbonate resin, polyethylene terephthalate resin of food contact materials and products. 2 Principle The specimen is extracted through extracting solution; vaporize the extracting solution till it is dry; after the residues are dried, use weight method to determine the content of extract in the specimen. 3 Reagents and Materials (Extracting Solution) Unless otherwise is specified, the reagents used in this Method shall be analytically pure; while water used shall be Class-II water specified in GB/T 6682. 3.1 Reagents 3.1.1 Acetic acid (CH3COOH). 3.1.2 Anhydrous ethanol (C2H5OH). 3.1.3 95% ethanol. 3.1.4 Normal hexane (C6H14). 3.1.5 Normal heptane (C7H16). 3.2 Reagent preparation (extracting solution) 3.2.1 4% acetic acid solution (volume fraction). weigh 40mL of acetic acid, add ......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.