VERROCCHIO

"Verrocchio" envelopes are made from Duralong PaperPhoto quality paper, glued on two sides with an acid-free adhesive and open on the short side with non - adhesive flap. The envelopes are internally padded with shaped felt, compact and flexible, covered with japanese paper of 18 gr/mq. They are made with a double expandable side fold to facilitate the adaptation of the various thicknesess of the artworks. External envelope TECHNICAL SPECIFICATIONS • 100% Alfa cellulose • Buffered (calcium carbonate reserve) • pH 8,5 - 9,0 Internal padding TECHNICAL SPECIFICATIONS • Felt: 65% Polyestere + 35% Cotton • Japanese paper: 30% Japan kozo + 70% Manila • Unbuffered • pH 6,5 • smooth non-abrasive surface • Air permeability: not less than 40 liters per dm² / min