EPDM (Ethylene Propylene Diene Rubber) vs PI (Polyimide): 0% composition overlap. Significantly different materials serving different application areas.
EPDM (Ethylene Propylene Diene Rubber) vs PI (Polyimide)
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.
PI (Polyimide)
Polyimide — THE extreme-temperature polymer. Continuous use 250-300°C (short-term to 400°C+). Outstanding thermal stability, low outgassing, excellent radiation resistance, and self-lubricating. Available as film (Kapton, DuPont), parts (Vespel, DuPont), and moldable resin. Expensive but irreplaceable where no other polymer survives. Used for aerospace bearings/seals, semiconductor processing, flexible circuit boards (Kapton), jet engine components, and space applications.
| EPDM (Ethylene Propylene Diene Rubber) | PI (Polyimide) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 37 | ASTM D638 |
Mechanical properties
| Property | EPDM (Ethylene Propylene Diene Rubber) | PI (Polyimide) | Unit |
|---|---|---|---|
| tensile_strength | 7–21 | 72–120 | MPa |
| elongation | 100–700 | 7–30 | % |
| hardness_shore_a | 30–90 | — | Shore A |
Compatibility Assessment
EPDM (Ethylene Propylene Diene Rubber) and PI (Polyimide) 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 PI (Polyimide)?
EPDM (Ethylene Propylene Diene Rubber) and PI (Polyimide) have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace EPDM (Ethylene Propylene Diene Rubber) with PI (Polyimide)?
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 PI (Polyimide)?
The main differences are in the following elements: overall alloying content. EPDM (Ethylene Propylene Diene Rubber) is a Polymers grade, while PI (Polyimide) is a Polymers grade.
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.