Desiccant in general at home and abroad packaging materials are mainly divided into: domestic ventilation paper, filter paper desiccant, non-woven desiccant, laminating desiccant, paper desiccant, and the United States du Pont company Special Guardian Desiccant. Filter paper can be used in small size silicone desiccant packaging, for packaging montmorillonite strength is not enough and easy to leak powder, good ventilation; poor permeability of composite paper, resulting in slow moisture absorption, generally not suitable for electronic products moisture-proof packaging; Non-woven fabrics have a certain strength, and good ventilation, but for packaging montmorillonite, easy to leak powder; mesh paper good ventilation, high strength, dustproof good, wide applicability, the price is higher than the common composite paper, but far lower than DuPont paper, is the ideal choice of high-grade packaging materials; special Wei Qiang ( Tyvek is an ideal material for a variety of desiccant packaging, desiccant, with high strength, folding, tear resistance, anti-static, breathable good characteristics, but also has excellent weather resistance and chemical resistance, dust-free design, for packaging desiccant, both good ventilation, and enough strength and beautiful printing effect, The only drawback is the price is high. Calcium chloride desiccant is the industrial and laboratory commonly used desiccant also called suction agent, is used in moisture, mildew, drying effect, according to the adsorption mode and reaction products of different physical adsorption desiccant and chemical adsorption desiccant. Physical adsorption desiccant Silica gel, alumina gel, molecular sieve, activated carbon, bone charcoal, charcoal, mineral desiccant, or reactive clay, its drying principle is to physically adsorption water molecules in their own structure. Desiccant is a kind of water-removing agent that absorbs moisture from the atmosphere, and its drying principle is to become another substance by physical means of adsorption of aqueous molecules in their own structures or chemically absorbing water molecules and altering their chemical structures. Chemical adsorption of commonly used desiccant drying lime, magnesium chloride, calcium chloride, alkali lime or phosphorus pentoxide, silicate, etc., they are chemically absorbed water molecules and change their chemical structure, into another substance. Physical adsorption of the commonly used desiccant silica gel, clay desiccant, molecular sieve desiccant, mineral desiccant, fiber desiccant, Montmorillonite desiccant.