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Knowledge for
the Sulphuric Acid Industry
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Materials of Construction - EPDM
March 11, 2003
| Common Name |
EPDM, EPT |
| Chemical Name |
EPDM - Ethylene Propylene Diene Monomer
or
EPT – Ethylene Propylene Terpolymer |
| Trade Names |
Nordel® (registered trademarks of DuPont Dow
Elastomers) |
| General |
EPDM is a M Class Rubber
- Contains a saturated chain of the polymethylene type
- Terpolymer of ethylene, propylene and a diene with the
residual unsaturated portion of the diene in the side chain
EPDM has good abrasion and tear resistance
to a variety of acids and bases. It is susceptible to attack by oils and is not
recommended for applications involving petroleum oils, strong acids or strong bases.
It has exceptionally good weather aging and ozone resistance. It is fairly
good with ketones and alcohols and has an excellent temperature range. Because it
has a negligible absorption rate, it is not susceptible to swelling.
It is the most economical of the
elastomers.
EDPM meets CSA standard B137.0-1973 for
toxicity. |
| Application |
General
- Do not use EPDM with petroleum oils
Sulphuric Acid Plants
- Seals and gaskets in the gas cleaning system handling weak
sulphuric acid. Gaskets may be bonded with PTFE or PVDF for maximum corrosion
allowance.
- Plate heat exchanger gaskets
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