selection-material 3

[mictyb]

Good morning everybody
J'm interested in selection of material for seals which will control air flow to a diesel engine.
Temeperature range of the gasket: Temperature range = -40 ºC to +170 ºC
Maximum internal pressure (Pi) = 3.2 bar absolute.
Pressure range across the seal = -0.275 bar to +2.2 bar relative.
Fluid resistance
The seal shall be able to resist the following:-
Diesel fuel.
Bio diesel.
Engine oil.
Engine coolant / ethylene glycol

J am thinking about rubber based on FKM material.
Could anybody help me with selectiong approporiate material for this purpose?.
Thank You
Mike

 

[JIM317]

If you want details on FKM contact DuPont Technical for details. Silicone rubber might be an alteernative.
JIM317

 

[berti]

Hi all,

sorry for answering so late.

Fluoro rubber (FKM) has a week point in cold flex. Minus 40 °C is very difficult even with incredibly expensive special types.

Looking at the requested oil and diesel resistance I would recommend fluorosilicone.

Have a look at Dow-Corning page for SILASTIC LS-types.

HTH

berti

 

[Fonda]

You might want to look at either a Hydrogenated Nitrile HNBR or a Polyacrlate material both avaliable from Zeon Chemical. Try their website

http://www.zeonchemicals.com

 

[mictyb]

Thank You very much to all
but
1) If J good remember ACM material is not resistance to Ethylene-glycol solution and biodisel.
2)H-NBR J' affraid about the upper service tem.
3)FVMQ should be good choice(the price is the most important parameter) but it swell more in disel oil than FKM.