Product Group Description Shelf Life 300 Series Insulation Products Ceramic Paper, Blanket, Boards, Woven Tapes, Sleeving, etc These materials do not expire, but we typically recommend two years. 900 Series Machineable Products Alumina Silicate, Macor, Glass, Graphite, Alumina, Fused Silica, etc. These materials do not expire, but we typically recommend two years. 700 Series Castable Ceramics Liquid Foam, Alumina, Alumina...