Envelopes Perma Dur (B)

The acid free and lignin free envelopes are suitable for storing documents, clipping, pamphlets and more. The envelopes are made from Perma/Dur stock that is buffered with approximately 3% calcium carbonate. Each envelopes is manufactured using neutral pH adhesive and has an ungummed flap that helps to keep out light and dust. The envelopes do not have a centre seam that could mar the content if excess pressure was applied, instead there are two side seams that are safer and provide more even stacking when filing in large groups.