Drierite Desiccants are anhydrous calcium sulfate. This substance has a neutral pH, is constant in volume and is chemically inert except in water. It is insoluble in organic liquids and refrigerants, non-disintegrating, non-wetting, non-toxic and non-corrosive. It is also non-channeling.
It is economical to use and can be regenerated for repeated usage. It is generally recognized as safe (GRAS) by the FDA.
The typical analysis is greater than 99.5% CaS04. DRIERITE will absorb six to eight percent of its weight in water, depending on the relative humidity.
Indicating DRIERITE is impregnated with cobalt chloride. Indicating DRIERITE is blue when dry and changes to pink upon absorption of moisture. The color change is pronounced and clearly visible. It has the same efficiency as Regular DRIERITE, and somewhat greater capacity due to the desiccating effect of the cobalt chloride.