GB/T 20186.2-2021 in English
VALIDSecondary coating materials used for optical fibre—Part 2: Modified propylene resin
- Issued on:2021-10-11
- Implemented on:2022-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 20186.2-2021光纤用二次被覆材料 第2部分：改性聚丙烯》由TC485（全国通信标准化技术委员会）归口，主管部门为工业和信息化部（通信）。
Introduction
Core changes in the standard revision
| Technical indicators | Requirements of the 2008 version | Changes in the 2021 version |
|---|---|---|
| Melt index | Fixed value range | Add typical value marking, allowing supply and demand negotiation |
| Oxidation induction period | Not required | Added 200℃≥30min indicator |
| Environmental performance | No regulations | Added limits for 6 types of heavy metals + 4 types of phthalates |
Analysis of key performance indicators
Mechanical performance requirements of modified polypropylene
The standard stipulates that the tensile yield strength is ≥20MPa and the elongation at break is ≥100%, ensuring that the material can withstand mechanical stress without breaking during the optical fiber cabling process. In actual applications, a manufacturer has added elastomers to modify the material to achieve an impact strength of 12kJ/m², which exceeds the standard requirement by 50%.
Key points of environmental compliance
Added Table 2 to specify the requirements for restricted substances, special attention should be paid to:
- Total amount of phthalates ≤4000mg/kg (total of four substances)
- The detection method adopts Py/TD-GC-MS pyrolysis gas chromatography-mass spectrometry technology
Implementation suggestions
Production process control
1. The moisture content test uses the method in normative Appendix A, please note:
- The weighing process must be completed within 10 minutes
- The drying temperature is strictly controlled at 100℃±1℃
Quality inspection optimization
Suggested additions:
- Melt index batch fluctuation monitoring (230℃/2.16kg conditions)
- Oxidation induction period as a key indicator of material thermal stability
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