Desiccant Tyvek Pouch P/N: See Data Sheets Desiccant works by efficiently absorbing airborne moisture left inside the bag after vacuum sealing, and captures moisture that manages to pass through the bag material. Secure in a strong envelope of clean room compatible, sulphur-free, Tyvek plastic, these desiccants keep your devices dry. Meets the requirements of EIA 583 and MIL-D-3464, Types I&II. Choose from eight sizes for just the right amount of protection. See data sheet for part numbers.