Re: [frameconnews] Re: Societies materials etc

[NBwLNB@aol.com]

I don't entirely agree with Frank's assessment of Ragboard and
high
alphacellulose boards. Both ragboard and conservation board
utilize high
alphacellose fiber, are processed and bleached. Cotton has a
higher percentage
of
alphacellulose content prior to processing than wood and thus
reqires less
processing. However after processing, both contain
alphacellulose, its only
the source that's different (cotton-wood). From a preservation
standpoint,
alphacellulose is alphacellulose. As long as the processing and
bleaching for
both  is alkaline and complete, and buffer is added, they're
both safe.
	There are high alphacellulose papers made from cotton and wood
which are
acidic. There are cotton and wood papers that are alkaline. The
pH of high
alphacellulose papers and boards are dependant on the pH and
conditions under
which the papers are manufactured and are not from the source of
the
alphacellulose fibers.
	Museum ragboards are generally composed of a series if even
plies laminated
together, ie. 4ply or 8ply. This layering gives the board
excellent rigidity.
Conservation boards are generally composed of a 3 layers- two
thinner layers
in which one is usually colored and a thicker middle layer.

Norman

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