Silica gel type B is mainly used for air humidity regulator, catalysts and carrier,  and used as silicon gel chromatography of fine chemical products of raw material. Thus desiccant is widely used in the instrument and meter, and instruments, leather, footwear, bags, textile, food, and medicine, storage and transport of the relative humidity control environment, prevent moisture items, mildew and rust. It to package the technical indicators and desiccant for inspection, testing methods have clear rules. The safety performance of the silica gel, silica gel has the very strong adsorption ability, to the person's skin can produce dry effect.