GB/T 19208-2020 in English
VALIDGround vulcanized rubber
- Issued on:2020-03-06
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$233.00
《GB/T 19208-2020硫化橡胶粉》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
Introduction
Core changes in the standard revision
| Revision dimensions | 2008 version | 2020 version | Technical significance |
|---|---|---|---|
| Classification system | 3 categories | 7 categories (newly added A1-A3 tire subdivisions) | Precise matching of raw material sources |
| Toxic substance control | Not specified | Added 18 PAHs and heavy metal limits | Environmental protection requirements upgraded |
| Physical property indicators | 5 items | 12 items (newly added activation energy/polyisoprene) | Performance evaluation system is improved |
Analysis of key indicators
Particle size control requirements
The standard adopts dual sieve system control: zero sieve hole particle size (such as 2000μm) requires 100% passing, and the corresponding sieve hole particle size (such as 850μm) allows ≤10% sieve residue. Take 30-mesh rubber powder as an example:
- Zero sieve hole: 100% must pass through the 2360μm (8-mesh) sieve
- Main sieve hole: 850μm (20-mesh) sieve residue ≤10%
Innovation in the control of polycyclic aromatic hydrocarbons
A new Appendix A specifies the GC-MS detection method, and implements three-level control of 18 PAHs such as benzo[a]pyrene:
| Grade | Σ18PAHs(mg/kg) | Benzo[a]pyrene(mg/kg) | Applicable scenarios |
|---|---|---|---|
| Grade I | ≤1000 | ≤1 | Food contact materials |
| Grade II | ≤2000 | ≤20 | General industrial use |
| Grade III | ≤3000 | ≤100 | Special modified applications |
Activation energy determination technology
New ISO 11358-2:2014 method to distinguish the energy characteristics of different pulverization processes:
- Room temperature pulverization: E1≥1500 kJ/mol
- Solution crushing: E2≥2200 kJ/mol
- Water jet crushing: E3≥3300 kJ/mol
This index can predict the reactivity of rubber powder during the regeneration process and guide the formulation design.
Implementation suggestions
- Raw material traceability: Establish A1/A2/A3 tire classification files
- Detection optimization: Equipped with GC-MS and thermogravimetric analyzer
- Process adjustment: Optimize regeneration temperature and time according to E value
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