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  1. aholloway

    Methods/technologies for cleaning of moulding tools ?

    There is no particular rule of thumb for amount of cycles for cleaning injection rubber molds. That is influenced by the type of rubber, the type of cure system, process aids, mold releases, temperature of cure and mostly by how you define "good surface finish." The most common ways to clean a...
  2. aholloway

    Rubber and hot Sodium Nitrate

    Have you considered EPDM (ethylene-propylene-diene termomomer)? The resistance guide I have rates it "A" in solution up to 200 deg F (93 deg C).
  3. aholloway

    Buna N vs. NBR

    To elaborate further on BCAREY's response, Buna-N, NBR and Nitrile are the same base co-polymer as he described. Hycar (now Nipol), Paracril, Krynac, and numerous others are brand names of the manufacturer of the base co-polymer. However, there are other differences than their ACN...
  4. aholloway

    Cracking of HNBR diaphragms

    The stiffening point of the diaphragm will be controlled by the acrylonite content of the base material, the degree of hydrogenation and the specific formulation of the HNBR but generally speaking HNBR has a Tg of about -15 to -40 deg C. That can be lowered by the addition of low temperature...
  5. aholloway

    What is C.I.R.? A type of rubber?

    Per ASTM D1418 (Vol 9.0) CIIR is chloro-isobutene-isoprene (chlorobutyl). Maybe someone left out the second "I"?
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