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 with a 0 capacity below are designed for storage of a flat item such as a document or photograph, where as the others have a 1/8" capacity. Made of tan 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.