Does equal hardness establish similar compression set?
Indentation hardness and recovery after compression measure different responses. Match temperature and state of cure.
Align cure before compression testing
Prepare specimens using traceable cure curves. Match dimensions, compression conditions and recovery time before comparing deformation relevant to long-term sealing.
Should an EPDM grade change trigger a new cure curve?
Check diene composition and run the same formulation. Record scorch and optimum cure times. Extruded weatherseals: Compare die swell, surface finish, dimensional stability and cure rate. Weather-resistant elastomer parts: Under intended exposure, evaluate tensile properties, hardness and compression set after aging.
Checking Ethylene content and Diene type and content
Ethylene content (% by mass): Express on the polymer matrix basis. Diene type and content (% by mass): Check the actual grade offered and the cure system. Mooney viscosity (MU): Specify test temperature, rotor and oil-extension status.
What to record
- Diene type
- Cure curve
- Compression conditions
- Recovery time
- Compression set
Technical references
Products and processes
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