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  1. JIM317

    How can I determine the vulcanization system?

    Smithers Scientific can run the analysis for you. You need a reputable lab if you are going to pursue legal eagle stuff. If you have an OK O\ring have it runfor a control
  2. JIM317

    Nitrile Isolator Creep

    Chloroprene (neoprene) has always been a choice for bridge bearing pads and for architectural pads--you should contact DuPont and Laxness (Bayer) --they have a lot of background Your nitrile info should be available from your supplier--I believe Laxness also produces nitrile--Zeon is another one.
  3. JIM317

    Neoprene Shrinkage

    I don't know of any compound that wont shrink after curing. In the case of sheet it should aged for the number of hours required to reach equilibrium, then proceed with the process JIM KELLY
  4. JIM317

    Neoprene Shrinkage

    Place the sheet on a flat surface and make bench marks one meter apart on it. After 24 hrs check to see if their is shrinkage.,,If not you are stretching the adhesive coated sheet during application. Simplest solution would be to cut the holes 40 3/16" before fastening to panel to compensate...
  5. JIM317

    Rubber,mixing-hardnes?

    Worn out--means the clearances between the mix chanber sides and the rotors are too great. The dimensions (cleaances can be corrected. If the wear is too great the materials don't disperse as well as they should. What part of the world are you located in? Hope ur holdiay is enjoyable
  6. JIM317

    Newbie to Rubber Quality Control

    No one has mentioned the most important test--rubber to metal adhesion. Ash is a laboratory test that indicates % inorganic materials (ZnO and other metallic oxides if present). ASH cannot be used as a reinforcing filler for rubber as the previous post states. Lord Chemical can be a source of...
  7. JIM317

    selection-material

    If you want details on FKM contact DuPont Technical for details. Silicone rubber might be an alteernative. JIM317
  8. JIM317

    Rubber,mixing-hardnes?

    Orion1 What I meant to tell you was that a 2 pass mix in an internal mixer (banbury) is more liable to weighing errors than a one pass open mill mix. With a mill mix it is easy to see the iunincorporated materials in the pan, sweep them up and add them to the batch--you should not "loose"...
  9. JIM317

    Rubber curing systems

    The R. T, Vanderbilt Handbook would be the best source for this information. There are many, many curing systems and it lists the most common for each type of polymer. appliction information is also included. I believe the Handbook is available "on line"==you can run a search via Dogpile...
  10. JIM317

    Ntrile seal in dry atmospher

    Undeer normal "dry" conditions you should be OK--Hi or low temperatures could lead to deterioration. WWW.Coleparmer.com has a compatability chart for nitrile with chemicals
  11. JIM317

    epdm nonfill from lube

    Adding CaCO3 to the formula will provide mold relase. Stearic acid and waxes may help. If moisture is a problem add CaO. a solvent based mold lube would eliminate the water. It is almost impossible to answer without knowing the complete formula
  12. JIM317

    Rubber,mixing-hardnes?

    It may be that your filler and oil scales are inaccurate--Pigments and oils/softners will effect durometer the most. If you are mixing a masterbatch + final the accuracy of curative weighings can have an effect. Is the sp. grav of your compound varying too? I would have to know details of...

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