EPDM Rubber Gasket Life Expectancy

[sewerratt]

What is a reasonable life expectancy of an EPDM rubber gasket (homogenous black rubber, hardness 60 (Shore A), rated at 300deg, conforming to ANSI B16.21 and ASTM D1330 Steam Grade)? The application is in a low pressure air line (<8 psi) with a max operating temperature of 180deg. The air line is 36&quot; diameter and buried. The gasket is not in contact with the soil.

 

[atad]

I think your problem id the temperature - you are at the extreme for EPDM (350°F (180°C). You need to chane to viton (Fluorocarbon) or Kalrez - basically a high temperature material.

 

[sewerratt]

Let me clarify. The operating temp is 180degF or less. The specificied rubber is rated at 300degF. Does EPDM rubber have a definite usable life when operating at this temp?

 

[boo1]

Service life of min 20 years in typical non oxydizing applications, for gasket of ethylene propylene (EPDM) compounds at those temp range.

 

[mfaham]

I want the Military applications of EPDM

 

[Metalguy]

We need to keep in mind that there are different grades of EPDM. This elastomer is &quot;filled&quot; with mineral oil, and apparently the less oil the better it is, but it costs more.

Yes, I know that EPDM isn't oil-resistant, but manufactures do &quot;fill&quot; it with oil-don't know what kind.