Canned jars China GB4806 Food Contact Materials Testing Process
Date：2025-08-27 09:48:11 Classification
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The GB4806 testing process and core requirements for canned jars as food contact materials in China are summarized based on the "National Food Safety Standard for Glass Products for Food Contact" (GB4806.5-2016) and third-party testing practices:
I. Pre-Testing Preparation
1. Sample Requirements
- Provide 3-5 finished canned jars from the same batch (capacity must cover both minimum and maximum sizes).
- If the canned jars contain metal caps/seals, additional samples of the separate components (e.g., separate caps and rubber gaskets) are required.
2. Documentation
- Product technical documents (material description, production process, supplier list);
- Product label and instructions (indicating operating temperature range and food contact use);
- A copy of the business license with the official seal.
II. Core Test Items (Based on GB4806.5-2016)
| Test Category | Test Content and Limits
| Lead and Cadmium Migration | - Immersion in 4% acetic acid solution (24 hours, 70°C)
- Lead ≤ 0.8 mg/L, Cadmium ≤ 0.07 mg/L (Key Items⚠️)
| Thermal Stability | - High-temperature sudden cooling test (simulating pasteurization), no cracking
| Internal Stress Test | - Polarimeter test, residual stress ≤ 40 nm/cm (to prevent explosion risk)
| Sensory Test | - Immersion solution has no odor or visible coloration
| Additional Items | - When containing printing ink, total heavy metal content must be measured (lead ≤ 0.01 mg/cm²)
> Note: Metal caps must be tested for heavy metal leaching according to GB4806.9-2016, and rubber gaskets must comply with GB4806.11.
III. Testing Process
1. Selecting a Testing Agency
- Laboratories with CMA/CNAS accreditation are preferred (e.g., DTi).
2. Sample Submission and Plan Confirmation
- The laboratory will separate the testing plan by material (e.g., testing lead and cadmium migration on glass bottles and chromium/nickel dissolution on metal caps).
3. Testing Cycle and Cost
| Project | Cycle | Cost Range
| Basic Item (Lead/Cadmium Migration) | 5-7 Business Days | ¥800-1500
4. Result Processing
- Pass: Obtain a test report in both Chinese and English with the CMA stamp;
- Fail: Retest after adjusting the process (e.g., changing the ink/sealing material).
IV. Key Compliance Points and Risk Mitigation
1. Mandatory Labeling Requirements
- Bottles or packaging must be labeled with:
- "For Food Contact" or a spoon and chopsticks logo;
- Upper operating temperature limit (e.g., "For use at ≤100°C"). 2. Annual Maintenance Obligations
- Re-inspection is required when material formulas are changed.
- Annual random inspection of products of the same model (recommended: 10% of batches).
3. Special Import Requirements
- Non-Chinese manufacturers must submit test reports through the responsible unit in China.
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