Silicone grease migrating onto an existing solder joint may render
the joint difficult or impossible to resolder during a rework operation.
The grease may also migrate from the PWA to containers, bags, and/or
work surfaces which in turn may affect material coming in contact with
those items.

     Al Cash

> ----------
> From:         Dave Thomas[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Dave Thomas
> Sent:         Friday, July 31, 1998 6:01 AM
> To:   [log in to unmask]
> Subject:      [TN] Silicone grease around soldered joints!
>
> People
>
> I am looking for some assistance in justifying the non-use of silicone
> grease, ie Dow Corning 304, near soldered joints.
>
> Could someone please supply me with a route to suitable
> documentation/reports to support this?
>
> I understand that if silicone grease should get on a joint prior to
> soldering, there is a very good chance thatthe soldering process will
> be
> faulty. I am not so clear as to long term effects of silicone grease
> maybe
> migrating into soldered joints causing degredation and failure in
> service.
>
> The manufacturing site I am currently working with are unhappy about
> having
> silicone grease in their factory so I am having to find suitable
> alternatives. The difficulty is that my engineers are more than happy
> with
> silicone, but do not have to worry about long term effects.
>
> Your help would be appreciated.
>
>
> Regards
>
> Dave Thomas
>
> Nothing will ever be attempted, if all possible objections must
> first be overcome.
>
> -- Samuel Johnson, "Rasselas", 1759
>
> ===============================================================
> Dave Thomas                                     Nortel plc
> Principal NPI Engineer,                         London Road
> European Radio                          Harlow
>                                         Essex
> Telephone:      +44 1279 402901                 CM17 9NA
> Facsimile:      +44 1279 402100                 UK
> ESN:    742-2901
> E-mail: [log in to unmask]
> ===============================================================
>
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