| Composition |
–Base Polymer: Ethylene Propylene Diene Monomer (EPDM, ENB/DCPD types) |
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–Reinforcing Fillers: Carbon black (30–60 phr), silica (10–30 phr) |
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–Plasticizers: Paraffinic oils (10–20 phr) |
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–Curing Agents: Sulfur/accelerators (1–3 phr) or peroxide (DCP) |
| Physical Properties |
–Hardness (Shore A): 50–85 (ASTM D2240) |
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–Tensile Strength: 7–18 MPa (ASTM D412) |
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–Elongation at Break: 300–700% (ASTM D412) |
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–Density: 1.1–1.3 g/cm³ |
| Thermal Resistance |
–Service Temperature: -40°C to +150°C (intermittent 175°C) |
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–Thermal Stability: <10% weight loss at 150°C (24h, ASTM D573) |
| Chemical Resistance |
–Resistant To: Ozone, UV, weathering, polar solvents, and alkalis |
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–Limitations: Hydrocarbon oils, fuels, and halogenated compounds |
| Key Applications |
–Automotive: Weatherstripping, radiator hoses, and brake components |
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–Construction: Roofing membranes, expansion joints, and sealants |
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–Electrical: Cable insulation and surge arresters |
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–Appliances: Gaskets and vibration dampers |
| Processing |
–Mixing: Two-roll mill (20–30 min, 50–70°C) or internal mixer |
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–Molding: Compression/injection molding (160–200°C, 5–15 MPa) |
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–Curing: Post-cure (170°C, 2–4h) for optimal compression set |
| Safety & Compliance |
–MSDS: Non-flammable (flash point >250°C); avoid inhalation/skin contact |
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–Regulatory: REACH, RoHS, and UL 94 (flammability) |
| Storage |
–Conditions: Dry, <30°C, away from UV/ozone; shelf life 12–18 months |
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–Packaging: Polyethylene-lined bags (prevent contamination) |
| Quality Control |
–Testing: Mooney viscosity (ML 1+4. ASTM D1646), compression set (ASTM D395) |
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–Certifications: ISO 9001 (manufacturing), ASTM D2000 (standard classification) |
