Paper Archival Bond Permalife® 20-lb Letter
PERMALIFE® PAPER IS 25% COTTON, 20-LB BASIS WEIGHT, AND 8.5×11″
Originally developed by Dr. W. J. Barrow, this superior grade 20 lb. paper equals or exceeds the specifications for a permanent/durable paper. In tests simulating usage for 300+ years, it neither yellowed nor became brittle. Each sheet is watermarked with Permalife logo.