Our Ultra Clear line of bags made from polypropylene are safe for archiving and conservation. Polypropylene is the most widely accepted commercial archival storage material in the United States. It is recommended by both the International Organization for Standardization ISO 10214:1991(E) Sect 4.3 and the American National Standards Institute ANSI IT9.2-1991 Sec 3.3. The polypropylene used in our Ultra Clear Bags is naturally acid free and lignin free and conforms to PAT ISO standard 18916.

Our Standard Clarity line of bags made from polyethylene are sometimes used for temporary storage and conservation. Although PVC free, virtually acid free (less than 1000ppm) and dormant in consideration of gaseous emissions, these bags do not meet the rigorous standards of Archival Bags.