The document summarizes the physical properties of MIL-PRF-131 Class I Type I barrier packaging material called Protect 200. It has a caliper of 10.3 mil, yield of 2,650 in2/lb, and puncture resistance of 40 lbs. The material is biaxially oriented nylon/PE/cross-laminated PE/PE/foil/heavy duty coextruded with a water vapor transmission rate of 0.0005 cc/100in2/day and water vapor transmission rate of 0.0005 g/100in2/day. It has a seal strength of 23 lbs/in and is suggested to be heat sealed at 435°F, 60psi, and 3.