EPDM (Ethylene Propylene Diene Rubber) vs PBT (unfilled): 0% composition overlap. Significantly different materials serving different application areas.
EPDM (Ethylene Propylene Diene Rubber) vs PBT (unfilled)
Side-by-side chemical composition and mechanical property comparison.
Overview
EPDM (Ethylene Propylene Diene Rubber)
Ethylene propylene diene monomer rubber — THE outdoor/weather elastomer. Saturated backbone gives outstanding ozone, UV, and weathering resistance. Excellent resistance to steam, hot water, and polar solvents. NOT resistant to oils/fuels (opposite of NBR). Good electrical insulation. ρ 0.85-1.3 (lightest common rubber). Used for automotive door/window seals, roofing membranes, radiator hoses, HVAC gaskets, and pond liners.
PBT (unfilled)
Polybutylene Terephthalate — semi-crystalline polyester with fast crystallization (short cycle times), very low moisture absorption (0.15%), excellent dimensional stability, and good electrical properties. Key advantage over PA: properties nearly independent of humidity. Trade names include Ultradur (BASF), Celanex/Crastin (Celanese/DuPont), Valox (SABIC), Arnite T (DSM). Used for electrical connectors, relay housings, automotive sensors, and any precision part in humid environments.
| EPDM (Ethylene Propylene Diene Rubber) | PBT (unfilled) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 37 | ISO 10350 |
Chemical composition (wt%) — Pro
| Element | EPDM (Ethylene Propylene Diene Rubber) | PBT (unfilled) | Overlap |
|---|---|---|---|
| Ethylene | 45–75% | — | — |
| Propylene | 25–55% | — | — |
| Diene (ENB/DCPD) | 2–10% | — | — |
| Base Polymer (Polybutylene Terephthalate) | — | 99–99.9% | — |
Mechanical properties — Pro
| Property | EPDM (Ethylene Propylene Diene Rubber) | PBT (unfilled) | Unit |
|---|---|---|---|
| Tensile Strength | 7–21 | 50–65 | MPa |
| Elongation | 100–700 | 50–100 | % |
| hardness_shore_a | 30–90 | — | Shore A |
| Density | |||
| continuous_service_temp | |||
| Yield Strength | |||
| Elastic Modulus | |||
| Melting Point | |||
| Glass Transition Temp (Tg) | |||
| Water Absorption (24h) | |||
| Tensile Strength | |||
| Tensile Modulus | |||
| Elongation at Break | |||
| Charpy Impact (notched) | |||
| Density | |||
| Melting Point | |||
| HDT/A (1.8 MPa) | |||
| Water Absorption (24h) |
Sign up free and get 3 full comparisons immediately.
Sign up free — 3 comparisons/day freeCompatibility Assessment
EPDM (Ethylene Propylene Diene Rubber) and PBT (unfilled) have significantly different compositions (0% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is EPDM (Ethylene Propylene Diene Rubber) the same as PBT (unfilled)?
EPDM (Ethylene Propylene Diene Rubber) and PBT (unfilled) have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace EPDM (Ethylene Propylene Diene Rubber) with PBT (unfilled)?
Generally not recommended. The compositions differ significantly (0% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between EPDM (Ethylene Propylene Diene Rubber) and PBT (unfilled)?
The main differences are in the following elements: overall alloying content. EPDM (Ethylene Propylene Diene Rubber) is a Polymers grade, while PBT (unfilled) is a Polymers grade.
Related Comparisons
View full data for each material:
Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.