Moisture control: The desiccant absorbs moisture vapour through the capillary action of the absorbent particles. Neither the particles, nor the bag that contains the particles, is changed physically by the absorption action. As well, the container does not become saturated, therefore it doesn't soften or liquefy during use. And metal parts touching the bag will not corrode. Dust-free: Tyvek bags are ideal for applications where dust must be kept to a minimum. Examples include computer components, packaged chemicals and photographic and optical devices.