Are they really Halogen free, or are they low halogen content with maximum 900 PPM of Chlorine and 900 PPM Bromine with maximum of 1500 PPM for both?
Dewey
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Kallin, Dan
Sent: Tuesday, February 21, 2006 7:43 AM
To: [log in to unmask]
Subject: Re: [LF] Soldermask for PC Boards
hal·o·gen (hăl'ə-jən)
n.
Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.
I would defer to a chemist as to its stability, but the toxicity of the other forms, and especially penta- and octa-, is less disputed.
While RoHS does allow for the use of Deca, not all halogen free legislation does. Some go so far as to restrict the use of PVC as well.
Dan Kallin
[log in to unmask]
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of MA/NY DDave
Sent: Tuesday, February 21, 2006 1:53 AM
To: [log in to unmask]
Subject: Re: [LF] Soldermask for PC Boards
Hi Camille, OrganicChemistry-UnChallenged IPC LF Listservers,
This is from a note by Camille, and I was wondering about a small point
that probably I should know.
<====
<I'll admit that when I first started reading about the RoHS and
other "green" technology issues a couple of years ago, I would sometimes
call something "halogen-free" rather than type out "does not contain the
PBBs or PBDE's, specifically penta-BDE and octa-BDE [because deca-BDE is
still okay, so even saying all poly-BDEs isn't technically correct] that
are banned by RoHS". The discussion early last year showed me that when I
was asking "halogens", I was using a far more generic term than I realized.>
<=====
penta is 06 I believe
octa is 08
deca is 10
If the above is correct what makes deca so much more stable.
Yours in Engineering, Dave
YiEngr, MA/NY DDave
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