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inert gas purge or vacuum for thick section peroxide cured elastomers

inert gas purge or vacuum for thick section peroxide cured elastomers

inert gas purge or vacuum for thick section peroxide cured elastomers

(OP)
I know bumping is commonly used and with FKM incorporation of a desiccant is helpful, but how practical is it to purge a large transfer or compression mold for a peroxide cured elastomers like HNBR or EPDM and is it effective?
Thanks
gumby69

RE: inert gas purge or vacuum for thick section peroxide cured elastomers

Use CaO in peroxide cured HNBR and EPDM too. It is possible to use a vacuum hood for transfer and compression moulding.

RE: inert gas purge or vacuum for thick section peroxide cured elastomers

We have a part some 36" in diameter that is transfer molded using peroxide-cured epdm. We have considered a vacuum system, and may have to do so in the future. The biggest concern is how to port sufficient vacuum flow area, it will be a bit of a design challenge in the existing mold. Our vendor has other, smaller parts with vacuum systems for perfluoro-elastomers; the vacuum porting was designed into the molds from the start.

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