Any paper mfg. experts here?

From: Mark <f1diddler_at_yahoo.com>
Date: Thu, 29 Jan 2009 15:59:55 -0000

I do know that the old tan paper envelopes would destroy rubber, due to
acidic leaching. I want to know (not guess) if there is any risk (over
years) from sticking half of a 3x5 index card inside a (plasic) bag,
contacting rubber.

 This quote from Wikipedia.
<<Today, much of the commercially produced paper is acid-free,[5] but
this is largely the result of a shift from china clay to (cheaper)
chalk as the main filler material in the pulp: chalk reacts with acids,
and therefore requires the pulp to be chemically neutral or alkaline.
The sizing additives mixed into the pulp and/or applied to the surface
of the paper must also be acid-free.>>

thanks,
Mark B
Received on Thu Jan 29 2009 - 07:59:58 CET