Desiccant desiccant application amount is the most critical point. If the desiccant with less, would not achieve the role of an effective moisture, product will be against moisture; if the desiccant used more, it will produce waste, no economic objectives set within the product packaging and humidity at the beginning of the calculation to dry. dosage before, we must set a target humidity, which allows a maximum humidity within the package. In general, ordinary products can safely be stored at less than 50% humidity environment, there are many products require a lower humidity, for example 20% of the environment. The lower the humidity setting goals, you need to use more desiccant to keep dry in the package. Barrier packaging is water vapor transmission rate of water vapor transmission rate (g / m2 · day) means in the static environment of a stable temperature and humidity conditions, after 24 hours (one day) of water vapor permeates through the test time the test material of weight. Influence of water vapor permeability barrier packaging for a very large amount of desiccant, the same volume of packaging required to save the same time, if you use a good barrier material such as aluminum foil, the desiccant can be a little less, if you use poor barrier materials such as thin PE bag, you need to put a lot of desiccant can play the same effect. Selection of silica gel desiccant silica gel desiccant choice calculated amount: The amount of pore silica gel according to the formula (A2), (A3), (A4), (A5) Calculated: sealing the metal container using mechanical methods: W = 20 + V + 0.5 D .......................................... (A2) using plastic bags made of composite materials: W = 100AY + 0.5D .......................................... ( A3) using polyethylene packaging materials such as plastic film bags: W = 100AR1Y + 0.5D ....................................... (A4) using sealing tape sealing cans and plastic containers: W = 300R2Y + 0.5D .......................................... (A5) details: http: //www.gcgzj.com