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The new national standard for the determination of 5 food contact materials will be officially implemented on September 16, 2025!

Time：

2025-09-09

The new national standard for the determination of 5 food contact materials in the GB 31604 series will be officially implemented on September 16, 2025!

In recent years, China's safety supervision of food contact materials has become increasingly strict, and the standard system has been continuously improved and updated. The five national standards for the determination of food contact materials in the GB 31604 series will be officially implemented on September 16, 2025.

Interpretation of 5 Standards

1、 GB 31604.30-2025 Determination of Phthalate Compounds and Migration Determination

Phthalates are a widely used plasticizer, widely used in various food contact materials such as plastics, rubber, adhesives, coatings, etc.

The new standard GB 31604.30-2025 increases the number of phthalates from 18 to 19, and specifies the detection methods for residual and migration amounts of 19 commonly used phthalates plasticizers in food contact materials and their products (Part 1) and (Part 2).

Interpretation of GB 31604.30-2025 Standard

01. Scope of application of the standard

The first article on the determination of phthalates is applicable to the determination of 19 phthalates in food contact materials and products such as plastics, rubber, coatings, adhesives, etc;

The second article on the determination of migration of phthalates is applicable to the determination of migration of 19 phthalates in food contact materials and products.

02. Quick overview of revised content

Added determination methods for diisopropyl phthalate (DIDP) and migration amount;

The relevant expressions of detection limit and quantification limit have been changed, and the detection limit and quantification limit of different phthalates have been clarified;

The scope of application has been expanded from "food plastic packaging materials and products" to "various food contact materials such as plastics, rubber, coatings, adhesives, etc;

The preparation method of the test solution for the determination of phthalates has been changed, and the steps of ultrasonic extraction, n-hexane precipitation, centrifugal separation, etc. have been described in detail;

Changed the pre-treatment method for soaking ethanol containing food simulants (volume fraction>50%) in migration measurement;

Added a method for determining the migration amount of phthalate esters in food simulants containing fats and oils;

The calculation formula for migration determination has been changed, and the calculation method for the content of phthalates in different food simulants has been clarified.

2、 GB 31604.31-2025 Determination of residual and migration amounts of vinyl chloride, 1,1-dichloroethylene, and 1,1-dichloroethane

Chloroethylene is a monomer used in the synthesis of polyvinyl chloride (PVC). PVC is one of the commonly used general-purpose plastics, commonly used in the manufacture of bottle cap sealing gaskets, pastry trays, hoses, and other food contact materials. After chlorination treatment, PVC resin can also be used to obtain vinyl chloride resin, which can be used as a vinyl chloride anti-corrosion coating, adhesive, etc. in food contact materials.

1,1-dichloroethylene is a monomer used for the synthesis of polyvinylidene chloride (PDVC). PVDC, due to its good barrier properties, is commonly used in food contact materials to manufacture food casing films (ham sausages, square ham, etc.), cling films, composite film bags, etc.

1,1-dichloroethane is a saturated halogenated hydrocarbon in structure and cannot be used as a monomer for synthetic resins. It mainly comes from the side reaction products during the synthesis of vinyl chloride, so there may be a small amount of 1,1-dichloroethane in PVC resin.

Interpretation of GB 31604.31-2025 Standard

01. Scope of application of the standard

Plastic materials and products: including but not limited to food packaging, containers, tools, etc. made of plastics such as polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), etc. PVC is commonly used to manufacture bottle cap sealing gaskets, pastry trays, hoses, etc. PVDC is more commonly used for food sausage films (such as ham, square ham, etc.), cling film, composite film bags, etc;

Coating materials and products: including anti-corrosion coatings for food contact, decorative coatings, etc. PVC resin obtained by chlorination treatment is often used as anti-corrosion coatings or adhesives in food contact materials;

Adhesive materials: various adhesives used for food packaging composite, sealing and other purposes. In multi-layer composite packaging materials, adhesives may become a potential source of vinyl chloride compounds;

Paper and paper products: including food packaging paper, paper containers, etc. Although paper products themselves do not contain vinyl chloride compounds, coatings or adhesives containing these substances may be used during processing;

Ink materials: Ink used for food packaging printing, some ink formulations or printing processes may introduce vinyl chloride compounds.

02. Quick overview of revised content

This standard is a revised version of GB 31604.31-2016. Compared to the original standard, this standard has mainly modified five aspects:

The standard name has been modified, and the original standard title "Determination of Chloroethylene and Determination of Migration" has been changed to "Determination of Residual and Migration of Chloroethylene, 1,1-Dichloroethylene, and 1,1-Dichloroethane";

The scope of application of the standard has been expanded, with the original standard only applicable to plastic materials used in food contact, and the new standard expanding to include various types of materials such as plastics, coatings, adhesives, paper, ink, etc;

Two new target analytes, 1,1-dichloroethylene and 1,1-dichloroethane, have been added;

Modified the testing method, changing the GC-FID method used in the original standard to GC-ECD method, improving the sensitivity of the method, and using this method as the first method;

A second method (GC-MS method) has been added to further enhance the qualitative ability of the method and provide an additional method option for standard users

3、 GB 31604.61-2025 Determination of migration of 2,2,4,4-tetramethyl-1,3-cyclobutanediol

Gas chromatography (GC-FID) was used to detect the migration of 2,2,4,4-tetramethyl-1,3-cyclobutanediol in plastic and coating food contact materials.

At present, Tritan plastic has been widely used as a food contact material for bottles, kettles, water cups, etc., especially for infant and toddler food contact materials. As a monomer substance used for synthesizing Tritan plastic. Although the migration limit of 2,2,4,4-tetramethyl-1,3-cyclobutanediol is specified in GB 4806.7-2023 as not exceeding 5mg/kg, there has been a lack of corresponding testing method standards.

The inspection method specified in this standard can detect the migration of 2,2,4,4-tetramethyl-1,3-cyclobutanediol in water, 4% acetic acid, 10% ethanol, 20% ethanol, 50% ethanol, 95% ethanol, olive oil, and isooctane. The detection limit is 0.2-1mg/kg and the quantification limit is 0.5-2.5mg/kg, which can meet the actual requirements for compliance testing of 2,2,4,4-tetramethyl-1,3-cyclobutanediol migration in GB4806.7-2023, GB 4806.10-2016, and relevant announcements of the National Health Commission.

Interpretation of GB 31604.61-2025 Standard

01. Scope of application of the standard

This standard specifies the method for determining the migration amount of 2,2,4,4-tetramethyl-1,3-cyclobutanediol in food contact materials and products.

This standard is applicable to the determination of the migration amount of 2,2,4,4-tetramethyl-1,3-cyclobutanediol in plastic and coated food contact materials and products.

02. Principle

After conducting migration tests on food contact materials and products using food simulants or alternative solvents, the soaking solution of water, acidic, and ethanol containing food simulants is diluted with methanol for measurement; The soaking solution of oil containing food simulants was extracted with methanol and measured; Chemical alternative solvents (95% ethanol and isooctane) soaking solution were directly tested on the machine. The test solution is separated by gas chromatography column, determined by hydrogen flame ionization detector, characterized by retention time, and quantified by peak area external standard method.

4、 GB 31604.62-2025 Determination of Release and Migration of N-Nitrosamine Compounds

N-nitrosamine compounds are internationally recognized as strong carcinogens with significant hepatotoxicity and carcinogenicity.

In the production process of food contact materials such as rubber, plastic, ink, adhesives, etc., due to the use of specific accelerators, stabilizers, or antioxidants, they may react with nitrosating agents in the environment under specific conditions (such as high temperature, acidic environment), thereby generating N-nitrosamines. Once these harmful substances migrate into food, they will pose a serious threat to consumers' health.

The release of GB 31604.62-2025 fills the gap in China's testing standards for the migration of N-nitrosamines and their derivatives in rubber and other materials used in food contact.

The standard not only specifies the determination methods for 15 compounds, but also focuses on covering sensitive products such as rubber seals, hoses, and pacifiers.

5、 GB 31604.63-2025 Determination of migration of 4,4 '- hydroquinone and 1,1' - sulfonyl di (4-chlorobenzene)

4,4 '- hydroquinone and 1,1' - sulfonyl bis (4-chlorobenzene) are monomer raw materials for the synthesis of high-performance polymers such as PPSU (polyphenylsulfone), mainly used in high-end tableware, especially baby bottles, water cups, etc.

The newly released GB 31604.63-2025 standard uses liquid chromatography for detection. The soaking solution of water-based food simulants is filtered and directly tested on the machine; Soak the chemical substitute solvent in liquid nitrogen and blow it to near dryness, then convert the solvent and dissolve it again before testing it on the machine; Corn oil soaking solution was extracted with acetonitrile and purified separately on SPE columns for two target substances, and then tested separately on the machine. The detection limit for both target substances in this standard is 0.008mg/kg, and the quantification limit is 0.025mg/kg.

Interpretation of GB 31604.63-2025 Standard

（1） Scope of application of the standard

1. Applicable objects

1) Food contact materials and products: including materials such as plastics, rubber, coatings, adhesives, inks, etc. that may directly or indirectly come into contact with food.

2) Target substance:

4,4 '- Bisphenol (BPB): a bisphenol compound that may have endocrine disrupting effects similar to Bisphenol A (BPA);

1,1 '- Sulfonylbis (4-chlorobenzene) (DCDPS): A sulfonyl compound that may be used in polymer synthesis and has potential toxicity.

2. Applicable detection scenarios

Measurement of migration under simulated food contact conditions: applicable to simulated migration tests of different food types (acidic, oily, alcoholic, etc.); Detect the release of chemical substances from materials under high temperature, long-term exposure, and other conditions.

（2） Core detection method

1. Pre processing steps

1) Selection of food simulants (based on the actual type of food they come into contact with):

Water based food → 3% acetic acid, 10% ethanol

Oil based foods → Olive oil or alternative oils

Alcoholic food → 50% ethanol

2) Migration test conditions:

Temperature: 20 ° C~121 ° C (adjusted according to actual usage conditions)

Time: 10min~240h (short-term exposure or long-term storage simulation)

2. Instrument analysis

1) High performance liquid chromatography (HPLC): suitable for routine detection, economical and efficient.

2) Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS): High sensitivity, high selectivity, suitable for trace analysis.

3) Detection limit (LOD) and quantification limit (LOQ):

4,4 '- hydroquinone: LOD ≤ 0.01 mg/kg, LOQ ≤ 0.03 mg/kg

1,1 '- Sulfonylbis (4-chlorobenzene): LOD ≤ 0.005 mg/kg, LOQ ≤ 0.015 mg/kg

3. Method validation requirements

1) Precision: Relative standard deviation (RSD) ≤ 10%

2) Recovery rate: 80%~120%

3) Linear range: covering 1.5 to 2 times the expected migration amount

In the face of increasingly strict global control over food contact materials, Jiayu Testing has a professional testing technology team, equipped with advanced instruments and equipment, proficient in various regulatory standards, and specializes in providing FCM food contact material testing services for various food contact materials (such as plastics, coatings, metals, silicone, glass ceramic enamel, bamboo, paper, cardboard, etc.) in China, the United States, the European Union and its member states (France, Italy, Germany, etc.), Japan, South Korea and other countries to ensure that your products meet the regulatory requirements of various countries. Welcome to contact us at 400-9269-886 !