Recently Malcom Warrick I hope I spelled your name right!)  has been asking
"what is halide free?", in terms of content in flux.  Malcom has said that
the anaylst would consider a value less than the detection limit of the
technique to be zero.  My response to that is, with my "analyst" hat on I
would tend to agree, but as a flux customer I would tend to agree more with
Karen Tellefsen's answer, which I have summarized below.  (Hope I have done
it justice, Karen.) "...L0 means no (my emphasis) halide in the formula..."
while "...UP78 is REL1...because it's formula contains halide" but it is "a
Bellcore compliant paste".

Bev Christian
Nortel

> ----------
> From:         Karen
> Tellefsen[SMTP:[log in to unmask]]
> Sent:         Wednesday, August 12, 1998 1:35 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] ANSI/J-STD004
>
> At Alpha Metals, L0 means no halide in the formula;
> this is true for liquid fluxes and solder pastes.
> UP78 is REL1, and it passes AgCrO4 paper.
> We consider it a Bellcore compliant paste, but it's still REL1.
> It is REL1 because it's formula contains halide. Take a look at
> our technical bulletin.
>
> UP78-OSP is REL0, it has no halide in it's formula.  We don't
> add any halide to it.  Any trace halide in UP78-OSP is from
> trace halide contaminants in the raw materials, very, very tiny.
>
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