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GB 31604.5-2016Method for analysis of hygienic standard of polypropylene resin for food packing (English PDF)

食品安全国家标准食品接触材料及制品树脂中提取物的测定

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Issued by

National Health and Family Planning Commission of PRC

Level / Type

National · Mandatory

Issue date

August 31, 2016

Implementation date

March 1, 2017

Scope

GB 31604.5-2016 is the English-translated version of 食品安全国家标准食品接触材料及制品树脂中提取物的测定.

GB 31604.5-2016 — 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.

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Document preview — GB 31604.5-2016

National Standard of the People's Republic of China

Issued by: National Health and Family Planning Commission of PRC

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.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

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