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  1. CrystalSeal

    How can I determine the vulcanization system?

    Berti, Thanks. That is exactly what I am thinking. It seems I can determine if the system has the sulphur. But I might not be able to tell if the sulphur is for curing. Hopefully I can find a lab from another supplier to do the test for us. Regards Crystal
  2. CrystalSeal

    How can I determine the vulcanization system?

    We have a feild failed EPDM O-ring which is supposed to be cured by peroxide system. But the field engineer questioned it was actually cured by sulphur. Is there a procedure or quick experiment we can do to confirm the vulcanization system? Thank you for any help.
  3. CrystalSeal

    Surface finish problem with injection molding Polyurethane parts

    Hi, we received a injection molding polyurethane part from our new vendor. The surface shows a layer of brownish powder. It can be scratch off easity and was washed off by aceton and acetonitrile easily. Did anybody see this before and know what caused this? How may I determine what is the...
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