[benjiboo88]

Could someone inform me as to why Sodium Hydroxide in aqueous form is not compatible with FPM but is compatible with EPDM?

[Borek]

Please read the forum rules. You have to show your attempts at answering the question/solving the problem to receive help, it is a forum policy.

[benjiboo88]

And how do I do that?

[rolnor]

If you google these elastomers you can se that FPM containes fluorine and that probably makes it sensitive to
strong hydroxide solution.

[lifepharma]

FPM is the ISO designation, FKM is the ASTM designation. Viton®, Dai-El and Technoflon are brands for FPM polymers. All of the designations stand for one single base material, which is fluoro rubber. This rubber is used in applications that need O-rings that are resistant to high temperatures and chemical attacks.

[rolnor]

But is this fluororubber resistant to hydroxide?