Silica gel desiccant is a highly active adsorption material. It is usually made of reacting with sodium silicate an sulfuric acid, aging as well as acid bubble. It is insoluble in water and any solvents. On-poisonous and tasteless, chemical stability. It won't react with any material except alkli and hydrofluoric acid. Standard white silica gel is referred to as being non-indicating. As absorbs moisture it remains physically unchanged. Non-indicating silica gel is cheap and effective, available loose in bulk packs or packed in sachets.