I believe that the methylene chloride cure test was originally used for one
and two part screened masks. It was later modified for use with dry film
masks. I don't know the origin of the "acetone test", but my guess is that
somebody decided to use acetone instead of methylene chloride because
methylene chloride is listed as a carcinogen. I know that methylene
chloride is not acceptable for use with UV cure and several LPI masks.
Anyone else?
Don Vischulis
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Bev Christian
Sent: Tuesday, October 29, 2002 1:19 PM
To: [log in to unmask]
Subject: Re: [TN] Acetone Test for Solder Mask
Carrie,
I don't know about acetone, but the test you are talking about sounds like
IPC-TM-650 Test Methods Manual,number 2.3.23, "Cure (Permanency) Thermally
Cured Solder Mask", where they talk about using methylene chloride.
Perhaps your test is out of the old, what was it, SM840? Anyone else?
regards,
Bev Christian
Research in Motion
-----Original Message-----
From: Morse, Carrie [mailto:[log in to unmask]]
Sent: October 29, 2002 2:08 PM
To: [log in to unmask]
Subject: [TN] Acetone Test for Solder Mask
We are currently doing an "Acetone Test" on our incoming PWB's to test for
solder mask cure.
Our test entails saturating a swab with acetone and rubbing it on the mask.
Does anyone know where this test comes from? Is it a documented IPC test?
Also, if we do see any residue (i.e.: green or blue discoloration on the
swab), what does this
tell us and how much is enough to deem the test "failed"?
-Carrie
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