You may be looking at silicone and not silicon. Silicones are pervasive in
the environment. You may be using silicone rubber press pads which can
slowly revert after use an release silicone oils. Look at the lubricants
used in your facility also for a possible cause.

J. Fjelstad


At 09:09 AM 8/3/98 -0700, you wrote:
>> -----Original Message-----
>> From: Debbie Kenney
>> Posted At:    Monday, August 03, 1998 8:39 AM
>> Posted To:    IPC FORUM
>> Conversation: Silicon contamination
>> Subject:      Silicon contamination
>>
>> We are a manufacturer of flex circuits supplying to a customer base
>> that is extremely Silicon sensitive. Initial testing shows that we are
>> picking up the silicon in our lamination cycle, DOE's are continuing.
>> My questions to the industry are:
>>
>> 1. What chemicals are available that will remove silicon from finished
>> product?
>> 2. Will these chemicals also remove the Entek OSP coating?
>> 3. Ideas on clean room modifications to eliminate silicon
>> contamination ?
>> 4. Does anyone have recommendations on a good procedure for in house
>> testing of the silicon levels? Currently we contract with a lab which
>> takes 3-4 days.
>>
>> Thanks in advance,
>> Debbie Kenney
>> Multi-Fineline Electronix, Inc.
>> Disk Drive Division
>> (714) 996-1248 ex 215
>> [log in to unmask]
>
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