Ethylene propylene rubber
Ethylene propylene rubber (EPR, sometimes called EPM referring to an ASTM standard) is a type of
EPR is used in electrical cable insulation, and in many flexible rubber goods such as hoses or weatherstripping.
Properties
EPM is considered a valuable elastomer due to its useful
Amorphous forms of EPM are flexible at low temperatures (with glass transition points around -60 °C).[2] Via selection of certain sulfur compounds EPM can remain heat resistant up to 130 °C and up to 160 °C with peroxide curing. These two tables contain some of the main properties of EPM.[2]
Polymer properties
| Property Type | EPM Property |
|---|---|
Mooney viscosity at 125 °C
|
5-200 |
| Ethylene content percentage by weight | 45-80 |
| Diene content percentage by weight | 0-15 |
Specific gravity
|
0.855-0.880 |
| Property type | EPM Property |
|---|---|
| Hardness (Shore A durometer) | 30–95 |
Tensile strength (MPa)
|
7–21 |
Elongation
|
100–600% |
| Compression set B | 20–60% |
| Useful temperature range (°C) | −50 to +160 |
| Tear resistance | Fair to good |
Abrasion resistance
|
Fair to good |
| Resilience | Fair to good |
| Electrical properties | Insulator
|
Uses
EPM has a large number of uses due to the many ways in which the
rubber mechanical goods, plastic impact modification, thermoplastic vulcanisates and motor oil additive applications
.
EPM is even more prevalent as an mining industry.[2]
Producers
Major producers and suppliers of EPM include
Manufacture
EPM manufacture uses the same
See also
Francis P. Baldwin received the 1979 Charles Goodyear Medal for the many patents he held for these developments.
References
- ^ http://www.azom.com/article.aspx?ArticleID=1822 Azom.com, Ethylene Propylene Rubbers, Thursday 19 April 2012
- ^ a b c d e f g http://www.iisrp.com/webpolymers/10epdmsep11.pdf Archived 1 November 2013 at the Wayback Machine iisrp, Ethylene-Propylene Rubbers & Elastomers, Thursday 19 April 2012