Hi Malcom - there was quite a discussion in the JSTD-004 committee during
the last couple of meetings on the subject but my notes are too sketchy to
be of any use - Doug Pauls ([log in to unmask]) was in attendance and may be
able to shred some light on your question.

Dave Hillman
Rockwell Collins
[log in to unmask]




Malcolm Warwick <[log in to unmask]> on 08/06/98 05:32:01 AM

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Subject:  [TN] ANSI/J-STD 004 Interpretation




Rereading this document recently, a question arose about the interpretation
of "halide free" for flux classification and I wonder if anyone know the
intent behind the specification. There are minor anomolies in relation to
which tests have to be carried out (if it passes chromate paper, is a
quantitative test needed or not?), but the real question concerns the
maximum value of total ionic halie which changes the classification from L0
to L1. According to Table 2, the halide must be 0.0% for L0. The analyst in
me says that this means <0.05%. Is this interpretation correct? Some users
will of course specify other test methods and limits of detection, so what
is halide free by J-STD004 need not be halide free by other criteria.
A supplementary question is, how is the product classified if the user
specifies (as he is allowed) an analytical method which detects covalent
halide? If the product is L0 by the standard test method but has more than
0.05% halide including covalent material, what should it be listed as?
Thanks in advance for your help.
Malcolm

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