Eric,

Underwriters Laboratories has a thermal index  (10 and 56 day
accelerated tests) that provides a maximum continuous operating
temperature rating for flex materials. The majority of rated materials
on the market are limited to 105C.  There are a few choices rated in the
150-160C range, so you do have the option of specifying something like
125C performance.

As I've mention here recently, elevated temperature completely changes
the mechanical properties of flex adhesive so be careful if the flex
needs to be dynamic. Additionally, as others have already pointed out,
you may run into other systems problems beyond just the flex
survivability.

Andy Magee
Flex Guru
[log in to unmask]
(937) 435-3629

Eric wrote,
We are designing a new product which will contain a flex PWB. This is a
medical
application where the product may be sterilized by Autoclave (121 deg C
for 30
minutes). Is this likely to cause any problems?

Eric Christison
Mechanical Engineer
VLSI Vision Ltd
Aviation House
31 Pinkhill
Edinburgh
EH12 7BF

Tel:    +44 (0) 131 539 8165
Fax:    +44 (0) 131 539 7141

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