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  1. YossiD

    Acrylic=PMMA?

    I am looking for fungus resistance properties of various materials, using MIL-HDBK-454C Table 4-I (attached) as a reference. In that table, Acrylics are listed in Group I (fungus-inert in all modified states and grades), while Polymethyl Methacrylate (PMMA) is listed in Group II (fungus...
  2. YossiD

    Crash safety shock test comparison

    Thanks for the quick reply and for validating my approach. I agree that it is glorified arm waving, but I think it is a reasonable approach under the circumstances. The mounting screws are the only reasonable point of failure, as there are no parts that can fly off. I suspect that our customer...
  3. YossiD

    Crash safety shock test comparison

    I am preparing a similarity analysis for a rugged computer for defense applications. As usual, the customer is trying to minimize testing expenses and wants to accomplish as much environmental qualification as possible by means of similarity to other systems that have successfully completed the...
  4. YossiD

    Fungus resistance of TPU 3060?

    Thanks. How can I know which type of polyurethane the TPU 3060 is (polyether, polyester, etc.), and is there somewhere I can get data regarding TPU 3060 fungus resistance?
  5. YossiD

    Fungus resistance of TPU 3060?

    I am looking for information regarding fungus resistance of polyurethane material TPU 3060. Also, can someone tell me what the 3060 designation means? A quick internet search led me to ISO 16365-1:2014 (Designation system ...), but I don't have that spec. I'm hoping that someone in the forum...
  6. YossiD

    Specification for small head screws

    For a design he is working on, a colleague needs a 2-56 flathead countersunk screw with a small head diameter, no larger than 3.8mm. He managed to find several such screws online, but none were listed as compliant with any recognized specification. Does anyone know of specifications (MS, ANSI...
  7. YossiD

    Ball Point Rod?

    Thanks. Looks like what he's looking for.
  8. YossiD

    Ball Point Rod?

    A friend who has some wacky but sometimes practical ideas, has asked me if I know how to find an axially load bearing rod with a ball at the end to enable it to ride smoothly over a surface. This would essentially be like a ball point pen, but obviously bigger and stronger. I have seen similar...

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