This foil moisture barrier bag is designed to provide a static safe environment for sensitive electronic devices. The bags are heat sealable and suitable for vacuum packaging. Bags are printed with ESD and moisture warning symbols, and a lot code for traceability. 3M Moisture Barrier Bags Dri-Shield 3400 are manufactured from a laminate of polyester, foil, and polyethylene. The metal layer is intended to provide shielding of Electrostatic Discharge (ESD) and to help minimize the penetration of electric field. These bags are tested to meet or exceed certain electrical and physical requirements of ANSI/ESD S541 and to be ANSI/EDS S20.20 program compliant. Bags are RoHS Compliant and lead-free.