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Our Silica Gels meets various specifications and are used in the Pharmaceutical, Medical, Food, and Electronic industries. Silica Gel comes in non-indicating and indicating forms. Indicating Silica Gel changes colour when saturated which lets the user know when replacement is needed. Silica Gel is a porous form of silica made from sodium silicate and a mineral acid. The internal structure of Silica Gel is made up of interconnected microscopic pores which attract and hold water by physical adsorption and capillary condensation, allowing it to adsorb up to 35% of its weight of water. These gels are non-corrosive, non-toxic nature and are approved by the US government for use in food and drug packaging. It performs best at room temperature 21 - 32°C and high humidity 60 - 90%. Its size and shape does not change as it adsorbs moisture.