We use a polyester/polypropylene material available from Ankom
Technology to form pouches for cellulose extraction.  The material
may be purchased precut or by the yard.  The uncut form is not in
their regular price list.

The particulars are:
Ankom Technology
140 Turk Hill Road
Fairport, New York 14450
Tel:(716)425-3940
Fax:(716)425-3941
email:http://www.ankom.com

The regional sales manager for North American sales is
Brian Layton
Tel:(716)425-3940 ext.203
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Good Luck
Ed
WILLIAM E. WRIGHT
LABORATORY OF TREE-RING RESEARCH
BUILDING 58, WEST STADIUM
THE UNIVERSITY OF ARIZONA
TUCSON, ARIZONA 85721
PH. (520)621-2518
FAX (520)621-8229