Processed chlorine free (PCF) is made using a 100% chlorine free manufacturing process. PCF copier paper does not re-bleach paper using chlorine or chlorine compounds that are harmful to the environment and aquatic life and is certified by the Chlorine Free Association. Both paper and packaging are made using 100% recycled and 100% post-consumer materials. Paper has a 20 lb. basis weight with a 92 brightness making it ideal for daily use in copiers and printers. Acid-free for archival quality. 10 reams of 500 sheets per box. Meets Air Force Regulation # AF 164-117, JCP-065, and Executive Orders 13514 and 13423.