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  1. Friedhelm

    Aluminum 380 and A380

    Can someone explain to me what the difference is between the Aluminum alloys 380 and A380? I'm also having trouble to determine whether ASTM SC84B is a legitimate spec. It gets listed by search engines but is not listed on ASTM's site. I'm converting old drawings to CAD and have to replace...
  2. Friedhelm

    Creep Resistance of Polyurethane

    Hello, In a low pressure (20 psig)valve, we were using a stamped, 1/8" diameter, .032 thick Polyurethane disk of 90 durometer Shore hardness. The disk got bonded to the plunger. Now we switched to a plunger where the seal is molded to the plunger. We still are specifying 90 durometer...
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