Crescent Museum Rag Mat 100 Board 32 in. x 40 in. sheets white pack of 25 no.1153
100% cotton fibers. Pure natural 100% offers the ultimate in conservation of art on papers. All components are acid-free and do not contain aluminum or liquin. The boards are buffered with calcium carbonate, resulting in a pH of 8.5 to 9.5 according to independent laboratory TAPPI cold extraction test results. 32 in. x 40 in. 4 ply.