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  • Users: Rdpere
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  1. Rdpere

    Weight loss of an aluminium or copper object after corrosion

    A rookie question probably. Does an object lose or gain weight after corrosion? Even if oxide layer is peeled?
  2. Rdpere

    What kind of coatings are there for the copper products?

    Hello, so the coatings which I already know about: - Chemical nickel plating - Galvanic nickel plating - Chrome plating - Sn and Zn plating - Gold and silver plating - PVD plating Are there any more that im missing? I have lots of experience with Nickel plating, but the problem is since the...
  3. Rdpere

    Cataphoresis - standard thickness?

    Are there many standard thicknesses for cataphoresis coating? What is the range? Do you define thickness of cataphoresis on your drawing? Thank you!
  4. Rdpere

    PA66 GF30% - our injection moulder has problems has problems with this material

    The problem is that so far we have been injection moulding a part with a different material, "PS GP 154", but the product is cracking - it isnt strong enough when applying force to it, doesnt satisfy its function. We suggested to our injection moulder to make some tests with a different...
  5. Rdpere

    Transparent Flexible PVC tubes pipes getting foggy/yellowish

    Do you have any idea why the PVC flexible tubes that i am using for my watercooling system become foggy or yellowish? The problem is pretty common: https://www.overclockers.com/forums/attachment.php?attachmentid=110506&d=1337935992...
  6. Rdpere

    Sealing surface finish roughness (Ra) for Flat O-ring ?

    Im making a device which must hold a little less than 1 bar of air pressure. I have the problem as it is leaking and im not sure why ... I noticed that where one part is screwed to another (M assembles to the female hole with Flat Oring), there is a little damage because start of the thread is...
  7. Rdpere

    CuZn39Pb3 vs Al 6082 - machinability

    I did a quick calculation and Al 6082 is approximately five times cheaper than CuZn39Pb3 - per Volume! But the question is - is it really so much easier to machine CuZn39Pb3 (compared to Al 6082) so that in the end it is cheaper to manufacture products from CuZn39Pb3 material? For example...
  8. Rdpere

    BSPP vs BSPT - comparison and which applications?

    I know that BSPP is parallel and BSPT is tapered. I also know that the basic advantage of BSPT is that it doesnt need shoulder to be fixed with the object to which it is screwed, and that with some BSPT you dont need additional sealing as it cuts into material and seals by itself. Are there...

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