MIL-PRF-81705D, PERFORMANCE SPECIFICATION: BARRIER MATERIALS, FLEXIBLE, ELECTROSTATIC PROTECTIVE, HEAT- SEALABLE (03 SEP 1998) [SUPERSEDING MIL-B-81705C]., this specification establishes the requirements for heat-sealable, electrostatic discharge protective, flexible barrier materials used for the military packaging of microcircuits, sensitive semiconductor devices, sensitive resistors, and associated higher assemblies. In addition, the type I materials provide for watervaporproof protection and attenuation of electromagnetic interference effects (see 6.1).