GB 31604.5-2016 PDF English
US$70.00 · In stock · Download in 9 secondsGB 31604.5-2016: Method for analysis of hygienic standard of polypropylene resin for food packing Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 31604.5-2016 | English | 70 |
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Method for analysis of hygienic standard of polypropylene resin for food packing
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GB 31604.5-2016: Method for analysis of hygienic standard of polypropylene resin for food packing---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB31604.5-2016
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).
3.2 Reagent preparation (extracting solution)
3.2.1 4% acetic acid solution (volume fraction). weigh 40mL of acetic acid, add
960mL of water, mix evenly.
4 Apparatus
4.1 Balance. sensibility of 0.1mg.
4.3 Tweezers.
4.4 Water bath.
5 Analytical Procedures
5.1 Sampling method
Operate as per GB 5009.156.
5.2 Selection of extracting conditions on extracting solution of specimen
Operate as per the corresponding product standard.
5.3 Specimen determination
5.3.1 Immersion extraction determination
Weigh and place 2g (accurate to 0.1mg) of membrane with cutting area of 6.45cm2 into
the beaker; add 200mL of extracting solution, place into 50°C (accurate to ±1°C) water
bath to heat, so that its temperature can reach 50°C (accurate to ±1°C);
5.3.2 Reflux extraction determination
Weigh and place 2g (accurate to 0.1mg) of membrane with cutting area of 6.45cm2 or
resin particles into 500mL all-glass distiller’s flask; add 200mLof extracting solution,
connect with the condenser tube;
6 Expression of Analytical Results
6.1 Analytical results shall be calculated as per mass fraction
The extract in the specimen shall be calculated as per Formula (1).
7 Precision
The absolute difference between the two independent measurement results obtained
under repeatability condition shall not exceed 10% of the arithmetic mean.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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