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Almost all plastics which consist of long carbon chains absorb some moisture related to their chemical and physical features until the final production phase. The moisture absorbing proportion of plastics is clear at the moment of first polymerization but because of environmental conditions it may increase.
For example, During the transportation of the material from the production plant to the final user's plant.
When the material instantly meet with the different environment of moisture and temperature in the final user's plant. Within the period of stocking until the processing.
The final user can take some cautions against the moisturation of material because of the temperature changes when it came to the plant and stocked. The final user can decrease the moisture of the material specially in too hot summer and too cold winter months by keeping the container closed for 7-8 hours before the opening and fixing the environmental temperature of the stocking area as possible.
Even though the moisture of the material kept in a definite level by these cautions almost all plastics must be dehydrated by any process during the final production period.