Acid-Free Paper

« Back to Glossary Index

Paper made from pulp containing little or no acid, so it is less likely to degrade with age. Acid-free paper has four times the durability (with a lifespan of 200 years) of acid-sized paper (lifespan of 40-50 years) and is thought to be more environmentally sound. Also called alkaline paper, archival paper, neutral pH paper, permanent paper and thesis paper.