EPDM vs Natural Rubber for Bridge Expansion Joint Seals: Technical Comparison

The choice of seal material significantly impacts expansion joint performance and service life. EPDM (Ethylene Propylene Diene Monomer): Temperature range -50C to +150C. Ozone resistance: Excellent. UV resistance: Excellent. Chemical resistance: Good. Compression set: Low. Cost: 20-30% higher than natural rubber. Best for: Coastal environments, industrial zones, extreme temperature climates. Natural Rubber (NR): Temperature range -40C to +80C. Ozone resistance: Poor (requires antiozonant additives). UV resistance: Moderate. Chemical resistance: Limited. Compression set: Moderate. Cost: Lower. Best for: Inland locations, moderate climates, cost-sensitive projects. Recommendation: For most highway bridge applications in temperate climates, EPDM Grade 70 per ASTM D2000 provides the best balance of performance and cost. All our expansion joint seals are tested per EN 1337-3 and AASHTO M251 requirements.