Telecommunications Towers: Weatherproofing Coaxial Connectors with EPDM.
Telecommunications Towers: Weatherproofing Coaxial Connectors with EPDM
Problem Statement
Coaxial connectors in telecommunications towers fail due to ozone cracking, UV degradation, and compression set loss after 5+ years of exposure to -40°C to 120°C cycles. Standard NBR seals lose elasticity below -20°C.
Material Science Analysis
EPDM's saturated polymer backbone (no double bonds) resists ozone and UV attack. Its ethylene-propylene ratio (55:45) maintains flexibility at -50°C while limiting compression set to <25% (ASTM D395, Method B).
Technical Specifications
- Shore A Hardness: 70 ±5
- Tensile Strength: 12 MPa (ASTM D412)
- Elongation at Break: 350%
- Temperature Range: -50°C to +150°C (short-term 180°C)
- Compression Set (22h @ 150°C): 22%
- Dielectric Strength: 30 kV/mm (ASTM D149)
| Parameter | EPDM (RubberQ-7023) | NBR (Standard) | Silicone (VMQ) |
|---|---|---|---|
| Ozone Resistance (ASTM D1149) | No cracks @ 100 pphm, 40°C, 20% strain | Cracks @ 50 pphm | No cracks |
| Low-Temp Flexibility (°C) | -50 | -20 | -60 |
| Compression Set (22h @ 150°C) | 22% | 45% | 15% |
| Cost Index | 1.0 | 0.7 | 3.2 |
Standard Compliance
RubberQ's IATF 16949-certified process controls:
- Carbon black dispersion (ISO 11345, ≤5% variation)
- Cure time (±3 seconds via Moving Die Rheometer per ASTM D5289)
- Batch traceability (ISO 16232 cleanliness Class 5 for molding)
For custom material compound development or IATF 16949 documentation, consult RubberQ's engineering department.
