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I have a problem with a part that we have been using for years. We are installing Helicoils into a machined Block of Noryl. We are constantly getting cracking around the helicoils. None of the rest of the features in the part show any stress cracking. Note we see the cracks before any...

Thanks for the responses. What cutting fluids should I advise our machine shop to avoid? Also does anyone have a link that describes the different types of PVC? We have not seen this problem on the first 10K of the products we assembled and tested so I am comforatable with the material choice.

We have been manufacturing a sample block housing that is machined from PVC for many years (volume = 10K). All of the sudden we recently have been getting cracks in the PVC when the housing is placed under internal hydrostatic pressure. The pressure is pretty nominal and the walls are plenty...

Thanks for the reponse. So when you say "dont expect miracles," does that mean you would avoid Al all together even with some type of coating (power, polyuretahne, etc) for long term sea water deployment (6-12 months)? This is for an instrument housing, so if it leaks, the instrument (and...

Has anyone had any experience using Hard Annodized 6061 AL in long term Salt Water applications? I am considering using this for a Instrument Housing. In theory the Annodized layer is inert. Any feedback would be appreciated.

Hello I have a Marine (submersible) instrument design that calls for a Titanium Housing using a 316 Stainless Connector. Would having these two materials in contact with each other cause problems or accelerate corrosion? The 316 SS connector is threaded into the Titinaium Housing. Thanks.

Thanks again for the input. Any ideas on some type of plating? Nickel? It is looking more and more like Titanium is the only real answer as it will introduce more and more labor associated with applying an epocy/lapping etc.

Thanks for the responses. Another issue I forgot to mention is that the pressure requirement is 1000psi. I am leaning towards coating the stainless part with some type of marine epoxy but I am not sure if I can control the epoxy in the Oring groove or lap it to guanratee a smooth and uniform...

Hello, I work for a company that manufacturers Marine Instrumentation. We try and use Plastics or Titanium whenever possible but in this case we have a 316 SS part (passivated) fastened to a Delrin Housing. The 316 SS Part has an Oring Face seal against the Delrin Housing. We always see...