MIL-PRF-81705 Barrier Materials, Flexible, Electrostatic Discharge Protective, Heat-SealableThis 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 \(see 6.1\).

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MIL-PRF-81705E

3.7 Performance requirements. The performance of the barrier materials shall conform to

the requirements specified in table I, when tested in accordance with 4.6.

3.8 Workmanship. Barrier material surfaces shall be free from any foreign matter. Barrier

material shall be free from holes, tears, cuts, sharp creases, wrinkles, or other imperfections. The

barrier material shall be cut and trimmed of any selvage (see 4.3.2.1).

TABLE I. Performance requirements.

Characteristics

Applicable to

Requirements

Test

types

Paragraph

Reference

Seam Strength

I, III

4.6.1

1. As received material sealed & tested:

a. At room temperature (separation-inches)

No separation

b. At 100 �F and at 160 �F (separation-inches)

No separation

2. Sealed before aging at 160 �F for 12 days and

tested:

No separation

a. At room temperature (separation-inches)

b. At 100 �F and at 160 �F (separation-inches)

No separation

3. Sealed after aging at 160 �F for 12 days and

tested:

No separation

a. At room temperature (separation-inches)

No separation

b. At 100 �F and at 160 �F (separation-inches)

Seam Fabrication

I, III

No leakage at any

4.6.2

seams

Water vapor transmission rate (WVTR)

1. After room temperature flexing:

a. As received (gms/100 sq. in./24 hrs.)

0.02 (max)

4.6.1

b. Aged (gms/100 sq. in./24 hrs.)

0.02 (max)

2. After low temperature flexing:

As received (gms/100 sq. in./24 hrs.)

0.03 (max)