There's a Mil Std (or perhaps a Def Stan) out there somewhere which
specifies +85 deg C for non operating storage temperature. It's the maximum
temperature you can ever expect to see inside a container so it should be
good for the boot, er sorry trunk, of a car.
We specify 85 deg C for 18 hours as our test for non operating storage.
Regards,
Eric Christison Msc
Mechanical Engineer
Consumer & Micro Group - Imaging Division
STMicroelectronics
33 Pinkhill
Edinburgh
EH12 7BF
UK
Tel: +44 (0) 131 336 6165
Fax: +44 (0) 131 336 6001
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Croslin, Robert
Sent: Friday, April 23, 2004 8:08 PM
To: [log in to unmask]
Subject: [TN] ABS Plastic Melting Temperature
This is probably a little out of the normal range of questions taken by the
Technetters, but here goes. We've been using various boxes made of ABS
plastic with fire retardant to enclose our various electronic gadgets. In
twenty years, we've never had a problem with any of them cycling back from
the field with any kind of thermal related distortion or warp to the cases
even though they may sit in a rep's trunk in areas like Phoenix, Arizona
under elevated temperatures. Recently, our SQA group bought a new thermal
chamber so they can do some environmental testing. They cooked the units at
80*C and the plastic melted. Not surprising, since the softening point is
around 72*C. Now, they're asking the engineer to provide some kind of a
test specification for them to test to.
We've gone out and bought several specs used by the auto industry, but they
just list various ranges and guide you to developing your own spec. Does
anyone know of any spec anywhere that would cover plastics used in, or left
in the trunk or interior of an automobile?
Thanks in advance,
Bob
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