Calcium chloride is white powder and has a strong absorption ofmoisture. Its has a long moisture absorption period for 60days continuously.Under the condition of 90% humidity and 25℃，it can reach 100% of its weight within 10days and 200%within 60 days. It is has the best absorptive property on the market. The outerpackage uses PET and Dopont tyvek. The moisture absorbed inside will not flowout. After absorbing moisture, it will become gel. It can not be copied asthere is an obvious transformation after absorbing moisture.