Four flap envelopes used to protect and store glass slides, negatives, books, and other items. The design allows full protection of the contents as well as easy access and removal without harm. Envelopes have multiple scores to customize the depth (thickness) of the envelope to accomodate different thickness materials within the envelope. Made of acid free, lignin free, 80lb. text weight stock, with a minimum 8.5 pH, buffered with 3% calcium carbonate. Envelope meets ANSI IT 9.2 standards (PAT).
Custom sizes can be ordered as well, please inquire.