Why silicone mold dry on the surface while not inside?

Why silicone mold dry on the surface while not inside?

It is because that silicone mold is made of condensation cure silicone rubber, it is cured by absorbing moisture in the air and silica in the process

of making the water evaporated, but not transferred to the appropriate amount of water will float to the surface of this 

phenomenon. 

This phenomenon does not belong to the product quality topics, but no control over the water, promotion of silicone

rubber shelf life, shelf life is long before thrown these phenomena, when using silica gel, add the appropriate amount of 0.05%

moisture, mixing average can solve the problem.

2017-02-24