WRAS Approval: Navigating UK Water Regulations for Rubber Seals
Problem Statement
EPDM seals in potable water systems fail after 18 months due to chlorine-induced cracking (≥2 ppm residual Cl2). Standard compounds exhibit 40% compression set loss at 70°C/1,000 hrs.
Material Science Analysis
- Failure Mechanism: Chlorine attacks unsaturated polymer chains in generic EPDM (4-5% ENB content).
- Solution: RubberQ’s WRAS-approved EPDM uses 8% ENB with peroxide curing, reducing chain mobility and oxidative degradation.
Technical Specifications
| Parameter | RubberQ EPDM (WRAS) | Standard EPDM | FKM Alternative |
|---|---|---|---|
| Shore A Hardness | 70 ±2 | 68 ±5 | 75 ±3 |
| Tensile Strength (MPa) | 14.5 | 9.8 | 16.2 |
| Elongation at Break (%) | 320 | 280 | 210 |
| Compression Set (70°C/1,000 hrs) | ≤15% | 40% | ≤10% |
| Chlorine Resistance (2 ppm/5 yrs) | No cracking | Cracks at 18 months | Overkill |
Standard Compliance
- IATF 16949-controlled compounding ensures ≤2% batch variance in ENB content.
- Full PPAP documentation including ASTM D2000 material callouts and ISO 3601 leak testing.
- Traceability: Raw material lot numbers embedded in molded seals via laser marking.
For custom material compound development or IATF 16949 documentation, consult RubberQ’s engineering department.
订阅技术更新
通过邮件接收最新材料洞察与工程案例速递。
相关文章
2026年4月05日
Liquid Silicone Rubber (LSR) Tooling: Why Initial Investment Pays Off in Precision.
Liquid Silicone Rubber (LSR) Tooling: Why Initial Investment Pays Off in Precision Problem Statement High-cycle manufacturing of precision components, such as EV battery seals and AI server gaskets, demands materials with exceptional dimensional stability and chemical resistance. Traditional elastomers like EPDM and NBR often fail under extreme thermal cycling and aggressive chemical exposure, leading to […]
阅读文章2026年4月05日
High-Tonnage Vulcanization: Managing Large-Scale Industrial Rubber Components.
High-Tonnage Vulcanization: Managing Large-Scale Industrial Rubber Components Problem Statement Large-scale industrial rubber components, such as conveyor belts and hydraulic seals, face premature failure under high-tonnage vulcanization. Common issues include chemical degradation at temperatures exceeding 200°C and compression set failure during high-pressure cycles. Material Science Analysis Standard EPDM polymers fail under extreme heat due to their […]
阅读文章2026年4月05日
Commercial Aircraft Interiors: Meeting Smoke and Toxicity Standards (FST).
Commercial Aircraft Interiors: Meeting Smoke and Toxicity Standards (FST) Problem Statement Polymer components in aircraft interiors must pass FAR 25.853 flammability tests while maintaining mechanical performance. Standard EPDM fails at 180°C with toxic smoke emission (HCN >100 ppm). Material Science Analysis Chloroprene rubber (CR) releases HCl gas during combustion. Fluorosilicone (FVMQ) provides superior thermal stability […]
阅读文章