Rubber seal ring China GB4806 test and declaration process
Date：2025-07-23 09:34:23 Classification
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According to China's mandatory standard GB4806.11 "Rubber materials and products for food contact" and supporting specifications, the test and declaration process for rubber seals (especially for food contact scenarios) is as follows, combined with the standard update requirements and test practices:
I. Preliminary preparation stage
1. Confirm the applicable standards
- New regulations implementation: GB4806.11-2023 has replaced the 2016 version on September 6, 2024, and explicitly no longer covers silicone rubber (silicone rubber must be implemented in accordance with other standards).
- Scope of application: natural rubber, synthetic rubber, vulcanized thermoplastic elastomer products (such as seals, gaskets).
2. Sample and material preparation
- Sample requirements:
- Provide 3 sets of complete finished products (including seals and supporting parts for food contact);
- Product instructions must be attached (specifying the use temperature, food contact type, etc.).
- Technical documents:
- Material composition table (including a list of additives such as vulcanizers and plasticizers);
- Production process description (such as vulcanization conditions).
II. Testing implementation phase
1. Core testing items
| Physical properties: Shore A hardness, tensile strength, elongation at break, compression set: GB/T 531/528/7759
| Chemical safety: total migration (simulated liquids such as 4% acetic acid/20% ethanol), potassium permanganate consumption, heavy metals (Pb/Cd migration): GB4806.11-2023
| Hazardous substances: phthalates, nitrosamines, polycyclic aromatic hydrocarbons (PAHs) migration: GB4806.11-2023
| Microbiological safety: total colony count, coliform group, pathogenic bacteria (for food contact purposes only): GB4789 series
2. Additional items for special scenarios
- Medium resistance test: If contact with grease, oil resistance volume change rate test (olive oil/chemical solvent immersion) is required;
- High temperature aging test: used for thermal equipment seals (≥100℃ requires simulated thermal aging).
III. Application and certification process
1. Institutional inspection
- Choose a laboratory with CMA+CNAS dual qualifications (such as Shenzhen Dezewei)];
- Fill in the application form and attach technical documents, and mail the sample.
2. Inspection cycle and cost
- Cycle: regular 5-7 working days (expedited can be shortened to 3 days);
- Cost: 1500-3000 yuan/piece (silicone rubber may be higher due to standard separation).
3. Report and certification
- After passing, obtain CNAS/CMA test report (marked in accordance with GB4806.11-2023);
- Need to apply for 3C certification at the same time (if the seal is used for mandatory certification products such as home appliances).
IV. Key points
1. Label compliance
- The product must be marked with "food contact", material, use temperature and taboos.
2. Changes and Updates
- Re-testing is required for formula/process changes or standard updates (such as the 2023 version tightening PAHs limits).
3. Import Applicability
- Imported seals must provide an equivalent international standard test report + Chinese label.
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