Nylon and Zinc

[Pud]

Ok, here goes:

We have new customer who has specified a part in nylon 6.6.

We have the contract and during the sign-off meeting they mentioned that the parts are bolted onto a galvanized steel part. The end use is a truck curtain sided trailer - non critical application.

I mentioned than Zn salts and nylon (why it's specified as 6.6, rather then 6 I have no idea!) are generally a no-no due to esc blah blah blah...

Has anyone actually experienced a failure to to nylon being in contact with Zn in the real world?

Cheers

Harry

http://www.tynevalleyplastics.co.uk

 

[patprimmer]

6.6 is somewhat better than 6 in this regard. That is one of the reasons it is preferred for water pipe compression olives.

Contact with galvanized pipe only causes a problem with 6.6 for highly chlorinated poor quality water. For instance in Aus main area they fail is Adelaide due to it being at the downstream end of our longest river which flows though a large irrigation area and a lot of desert before arriving at Adelaide.

Regards
Pat
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[CoryPad]

It can happen in automotive environments. The cyclic nature of the exposure, including high temperature near engine/exhaust, can result in concentrated salt contact.

 

[Mahua]

hello Harry

Zinc has a tendecy to be in zero valent state. in fact it is usually inert. as a result, there may be some kind of binding problem between zinc and the polymer.

While I have not worked with zinc myself, but my colleagues are working on that. Many metalorganic zinc complexes are not soluble in common organic solvents. I know my colleague who is working on this for several years faced this problem.