Samples,  We sometimes are required to use threadlockers on PCB hardware,
typically to secure hardware during vibration testing.  It is applied at the
final assembly level, after the boards are stuffed and conformal coated.  We
discourage its use in the board itself because we have had problems with the
threadlock material wicking into the laminate of the PWB and changing the
dielectric properties.  Many of these materials are anaerobic curing
&require contact with metal surfaces to cure -- when applied on a plastic
substrate the threadlocker won't cure properly & remains mobile.  Just some
things to be aware of ... Sheila Smith @ Tracor AES



t 07:29 AM 5/31/97 +0000, you wrote:
>When a customer / drawing  requires threadlock "loctite" on hardware 
>at the pcb level, what step in the manufacturing processes does it 
>get applied ?
>
>If prior to wave solder, what steps are taken to ensure it does not 
>break down ? example "loctite 242" breaks down at 300F.
>
>Do you have a problem with small hardware becoming loose during the 
>assembly processes?
>
>What material "threadlock" do you use in your facility?
>
>Where is it installed ?
>
>Do you re-apply after wavesolder / clean?
>
>If you re-apply, do you completely clean off old material ?
>
>
>Thanks for any feedback in advance;
>
>Wesley Samples
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