This acid-free mounting board carries a pH neutral, pressure-activated adhesive. The perfect choice for adhesive-resistant items such as photographs, varnished posters, prints on gloss paper, and laminated materials.  It's easy to use, and there are no sprays or wet pastes to deal with. Boards are 1500 microns (1.5mm) thick and using a roller will flatten art or photographic media ready for display.