A highly porous, inert form of amorphous silica, designed to reduce the humidity of air surrounding sensitive objects. Silica gel absorbs 40% of its own weight of water. 5 gms of Silica Gel will treat approximately one cubic foot of display. Self-indicating, changes from orange to green upon saturation but can be regenerated by heating. Conforms to BS 3523. Avaliable in sachets or a 1kg tub. Sachets supplied in packs of 10.