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  1. GrumpyPlasticBastard

    Material Properties

    We keep track of our machine settings, for a given viscosity of the material. Say our viscosity is 28MU, I have over a dozen sheets showing that we ran at a historical high of 365 for the mold temp and a historical low of 340. No notes from the operator no numbers in regards to scrap. Go...
  2. GrumpyPlasticBastard

    "KAP-0502"

    I have been tasked with finding an equivalent to this material. Originally it was supplied to us by PolyOne, then M A Hanna... then we stopped using it. Apparently P1 assimilated MA Hanna and now they call themselves Excel. A quick phone-call netted me "call back after the holiday please."...
  3. GrumpyPlasticBastard

    Rubber injection molding questions

    Currently I run a six hundred ton rubber injection molding press. Mold has six cavities. How do I go about calculating the tonnage required for a given mold with rubber? Is it the same "projected area" calculation that thermoplastic molding uses? Or are there additional factors I need to...
  4. GrumpyPlasticBastard

    Chemloc 8116 Primer (Lord Chemical)

    Found two jugs of this in our storeroom. We mold an EPDM compound over fiberglass rods. Due to cash flow issues we are looking to use as much of whatever we have on hand, rather than buying new batches of chemicals. Normally we use Chemloc 610, as that is made specifically for EPDM and...
  5. GrumpyPlasticBastard

    Mooney Viscosity Testing Of Incomming Rubber

    I am looking for information on Mooney Viscosity testers. They (current "hand that feeds me") wants to be able to test and catalog incoming lots and sub-batches within a lot. I need something user-friendly. Once specified a CMM and it was very poorly supported and difficult to program...
  6. GrumpyPlasticBastard

    Mold Release For EPDM Thermoset Application

    I mold an electrical insulator, six at a time. The machine is an injection mold machine designed for rubber thermoset molding. Material is a gray EPDM compound, our mold is running at 375 degrees. Tried many different release sprays... most just bake to the mold and cause issues. Some...

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