SN/T 5299-2021 in English
VALIDRules for the inspection of compounded rubber for import
- Issued on:2021-06-18
- Implemented on:2022-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
| Standard No: | SN/T 5299-2021 |
| Document status: | VALID |
| Title in English: | Rules for the inspection of compounded rubber for import |
| Title in Chinese: | 进口复合橡胶检验规程 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2021-06-18 |
| Implemented on: | 2022-01-01 |
| Professional Classification: | SN-Import&Export Inspection |
| Related Keywords: | composite rubber import inspection
composite rubber compounded rubber raw rubber content raw rubber |
| Related Topics: | import
rubber check rubber inspection Rubber femtosecond detection Rubber femtosecond detection compound glue Femtosecond detection of rubber repeatability test Imported natural rubber inspection rules smoked rubber sheet Compound Rubber compound glue Cobalt imports Rubber parts inspection Immediate inspection of imports Compound detection Rubber Inspection Equipment compound rubber Rubber compound Rubber strip inspection Composite film detection Imported pectin quality |
Introduction
Analysis of the core technical requirements of the standard
This standard applies to the entire process of composite rubber import inspection, and focuses on standardizing the quality red line of raw rubber content ≤88%. The detection method adopts a dual verification mechanism of thermogravimetric analysis (GB/T 14837) and infrared spectroscopy (GB/T 7764).
Comparison of key detection methods
| Detection items | Standard method | Technical points | Judgment threshold |
|---|---|---|---|
| Raw rubber content | GB/T 14837.1/2 | Thermogravimetric analysis temperature range control | ≤88% |
| Rubber qualitative analysis | GB/T 7764 | Infrared characteristic peak comparison | Library matching ≥90% |
| Appearance inspection | Visual inspection | Cut section uniformity | No visible impurities |
Analysis of difficulties in implementing the standard
Typical case: Testing of imported composite rubber from Southeast Asia
In 2022, when Qingdao Customs tested a batch of imported composite rubber from Indonesia, the infrared spectrum showed that the characteristic peak of styrene-butadiene rubber shifted. After thermogravimetric analysis, it was found that the raw rubber content reached 91.5%. It was finally determined that it did not meet the requirements of GB/T 31357 and was returned for shipment.
Technology Evolution Background
This standard replaces the original SN/T 0000-2019 version, with the following major updates:
1. Added reference to ISO 9924-3 international standard
2. Detailed requirements for liquid rubber sampling
3. Clarified the calculation method for the 88% content threshold
Company Compliance Recommendations
- Prepare a complete ingredient list in advance (Chinese and English versions)
- Liquid rubber transportation must be kept at a constant temperature of 25±5℃
- It is recommended to reserve 10% additional sample volume
- Pay attention to the abnormal addition of silica to rubber produced in Southeast Asia
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