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New type of biochemical desiccant which cabbe naturally degraded 100%, uses natural plant fiber as moisture absorptioncarrier and is environmentally friendly. It has high absorption property underthe condition of indoors and average humidity. Its saturated moistureabsorption rate can reach 300%(25℃,RH=100%), which is 20 times of that of common silica gel desiccant.Its effective wet controlling time is 30 to 90 days. It can reduce humiditystatically and remove odor. We use cotton paper which has strong airpermeability good toughness, puncture resistance, corrosion resistance, noreverse osmosis and is anti static electricity as packaging material. It isnon-toxic, colorless, tasteless, non-contact corrosion and environmentallyfriendly. It can be used to food packaging and is harmless to human body.