polymer and oxidative environment (vaporized hydrogen peroxide)

[belzeb]

do you have a any table of polymers compatibility with the vaporized hydrogen peroxide (concentration near 30% or more) ?
or any case of application of a polymer who will be resist.

thks

 

[Demon3]

That is a very special case and I doubt that specific information exists. As you know, hydrogen peroxide is an oxidizing agent so you need a polymer that resists oxidation well.

I would start with polyethylene and make sure you work with the supplier to get a grade with a good antioxidant stabilizer package. Specifically, you need antioxidants that won't leach out and leave the polymer unprotected. That means not using hydrolyzable, polar antioxidants like Iraganox 1010 but using non polar, stable kinds like Irganox 1330 instead. A World expert you could contact is Svein Jamtvedt, you can contact him through

http://www.norner.no

If the stabilized polyolefins are not good enough then you will have to try much more expensive polymers like PTFE.

Chris DeArmitt PhD FRSC CChem

http://www.phantomplastics.com

Consultant to the plastics industry

 

[patprimmer]

PTFE will do it, PE just might and without looking up published chemical resistance charts PVC and PET are also a chance.

Suppliers do publish extensive lists, but like Chris says, they will not be specific enough to answer your exact question.

You will most likely get data for strong hydrogen peroxide solutions and also for chlorine gas. If it is OK to both of those it would be avery good basis from which to start testing for yourself.

Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &

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for site rules

 

[belzeb]

ok thanks for your answer
I read more these ... I post on this forum because, I don't have enough informations by suppliers (because all the tests are made with liquid peroxide hydrogen).
I know that it's a particular case, I want to progress and increase the lifetime of my actual piece in PEEK.
I have think at PTFE, but this material don't have a big hardness.
PET can resit at the high temperature, vapor is at 130°C ?

regards

 

[Pud]

Are these injection moulded PEEK or parts machined from stock?

http://www.tynevalleyplastics.co.uk

 

[belzeb]

It's a machined parts (not mouldesd because the quantity is little)
what is the difference on the chemical resistance ?