Acid free paper that becomes wet will have a neutral or basic pH, and will
not cause corrosion. Sulfur free paper contains no sulfur, which can poison
the cure of platinum-cure silicone potting compounds. They're technically
different- that said, I believe that per ANSI and ISO standards, acid free
paper is also sulfur free.

Tom

On Tue, Jan 23, 2018 at 7:04 PM, SALA GABRIELE <[log in to unmask]> wrote:

> Hello
>
>
>
> Please, could someone there explain me the difference , if there is any,
> between Sulfur Free Paper and Acid Free Paper ?
>
>
>
> I am investigating about paper sheets interposed between PCB  (ENIG and
> ImAg
> finisch) when piled up for packaging and shipping.
>
>
>
> Many thanks
>
>
>
> Gabriele
>
>
>
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