EPDM (Ethylene Propylene Diene Rubber) vs PET (Polyester): 0% composition overlap. Significantly different materials serving different application areas.
EPDM (Ethylene Propylene Diene Rubber) vs PET (Polyester)
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.
PET (Polyester)
Polyethylene Terephthalate (semi-crystalline stock shape) — combines the stiffness of POM with the wear resistance of PA, without centerline porosity or moisture sensitivity. Excellent dimensional stability, low friction, very low water absorption (~0.1%). Better creep resistance than POM or PA. Widely known from bottles/packaging, but engineering PET-P is semi-crystalline and much stiffer. Trade names include Ertalyte (MCAM), Arnite (DSM), Rynite (DuPont, GF grades). Used for precision bearings in water, gears, slide elements, pump parts, and electrical insulators.
| EPDM (Ethylene Propylene Diene Rubber) | PET (Polyester) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 37 | ISO 10350 |
Chemical composition (wt%) — Pro
| Element | EPDM (Ethylene Propylene Diene Rubber) | PET (Polyester) | Overlap |
|---|---|---|---|
| Ethylene | 45–75% | — | — |
| Propylene | 25–55% | — | — |
| Diene (ENB/DCPD) | 2–10% | — | — |
| Base Polymer (Polyethylene Terephthalate) | — | 99–99.9% | — |
Mechanical properties — Pro
| Property | EPDM (Ethylene Propylene Diene Rubber) | PET (Polyester) | Unit |
|---|---|---|---|
| Tensile Strength | 7–21 | 55–80 | MPa |
| Elongation | 100–700 | 30–80 | % |
| hardness_shore_a | 30–90 | — | Shore A |
| Density | |||
| continuous_service_temp | |||
| Yield Strength | |||
| Elastic Modulus | |||
| Glass Transition Temp (Tg) | |||
| Melting Point | |||
| Water Absorption (24h) |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
EPDM (Ethylene Propylene Diene Rubber) and PET (Polyester) 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 PET (Polyester)?
EPDM (Ethylene Propylene Diene Rubber) and PET (Polyester) have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace EPDM (Ethylene Propylene Diene Rubber) with PET (Polyester)?
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 PET (Polyester)?
The main differences are in the following elements: overall alloying content. EPDM (Ethylene Propylene Diene Rubber) is a Polymers grade, while PET (Polyester) is a Polymers grade.
Related Comparisons
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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.