This 40 gsm (0.0012" calliper), pH 7, non-buffered, acid free glassine paper is made from selected chemical pulp and designed for general conservation use. This product passes the Photo Activity Test of ANSI IT 9.16 (R.I.T). It can be used as an interleaving and wrapping product for paper and textiles, or as an overlay in painting restoration. You can also use glassine as a protective wrapping for works of art undergoing transit.