EPDM: Ethylene-propylene-diene rubber
- Short Name
- EPDM
- Name
- Ethylene-propylene-diene rubber
- Group
- EM - Elastomers
- General Properties
- Chemical Formula
- Structural Formula
-
Properties
- Glass Transition Temperature
- -55 to -30 °C
- Melting Temperature
- -20 to 60 °C
- Melting Enthalpy
- 5 to 20 J/g
- Decomposition Temperature
- 470 to 487 °C
- Young's Modulus
- 2 to 10 MPa
- Coefficient of Linear Thermal Expansion
- 180 *10¯6/K
- Specific Heat Capacity
- 1.80 to 2.00 J/(g*K)
- Thermal Conductivity
- 0.26 W/(m*K)
- Density
- 0.86 g/cm³
- Morphology
- Rubber, sometimes with soft and hard segments
- General properties
- Very good electrical insulating properties. Very good ozone and sunlight resistance. Good aging resistance. Good resistance to heat, chemicals, hot water and water vapor
- Processing
- Cross-linking by means of sulfur (with accelerators) or peroxides
- Applications
- Seals and profiles. Cable sheathings and insulations. Cool water hoses. Components of household appliance. Construction sealing strips. Blend partners in PP-EPDM blends (TPV) to improve the impact strength of PP (application in the automobile industry as underbody or bumper material)
Internet Links
NETZSCH Measurements
- Instrument
- DSC 204 F1 Phoenix®
- Sample Mass
- 13.83 mg
- Isothermal Phase
- 7 min
- Heating/Colling Rates
- 10 K/min
- Crucible
- Al, pierced
- Atmosphere
- N2 (40 ml/min)
Evaluation
This EPDM sample is not purely amorphous since it exhibits a small melting transition at 6°C (peak temperature, 2nd heating, green) with an enthalpy of 0.8 J/g, indicating a small amount of crystalline content. The glass transition at -54°C (midpoint, both heatings) is from the amorphous content. The endothermal effect with peak temperatures of 43°C and 52°C (2nd heating, green) is probably due to the melting of additives. This appears as a single peak in the 1st heating (blue).