MIL-PRF-81705E 

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.

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MIL-PRF-81705E

 BARRIER MATERIALS, FLEXIBLE, ELECTROSTATIC DISCHARGE PROTECTIVE,
HEAT-SEALABLE

PERFORMANCE SPECIFICATION

 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.

Classification. The barrier materials are furnished in the following types and classes.
Type I – Watervaporproof, electrostatic protective, electrostatic and electromagnetic
shielding.
Class 1 – Suitable for hand operated or automated sealing equipment.
Class 2 – Suitable for automated sealing equipment.
Type III – Transparent, waterproof, electrostatic protective, electrostatic shielding.
Class 1 – Suitable for hand operated or automated sealing equipment.
Class 2 – Suitable for automated sealing equipment.

Qualification. The barrier materials furnished under this specification shall be products
that are authorized by the Qualifying Activity for listing on the applicable qualified products list
before contract award (see 4.2 and 6.4).

Material. Barrier materials shall be made from such materials and by such processes as
to ensure compliance with the performance requirements of this specification.

Construction. Barrier materials shall be constructed of one or more plies in any manner
which ensures compliance with the performance requirements of this specification.

Type I. Butting of type I component materials or the finished product is not permitted
except in the direction perpendicular to the rolling direction. When a butt weld is made on the finished product or any ply thereof, the areas shall be externally flagged with color markers to prevent use of that portion of the roll.

Type III barrier material shall be transparent, clear, or tinted any color. The
appearance shall be the same throughout the material. Butting of component materials or the
finished product is not permitted except in the direction perpendicular to the rolling direction.
When a butt weld is made on the finished product or any ply thereof, the areas shall be externally flagged with colored markers to prevent use of that portion of the roll.

Splices. A roll shall not contain more than 3 splices (4 pieces) and each piece shall be
not less than 45 yards in length. Splices within rolls shall be even the entire width of the roll
material and shall not come apart during unwinding of the roll. Rolls containing splices shall be flagged at both ends of each splice with colored markers to indicate splices within the roll. Barrier material in flat cut sheets shall not contain splices (see 4.3.2.2).

Form. Type I barrier material shall be furnished in rolls or flat cut sheets as specified in
the contract or delivery order (see 6.2). Type III barrier material shall be furnished only in rolls.

Rolls. The width of roll material shall be 36 inches, with a tolerance of plus or minus
¼ inch. The average length of roll material shall be not less than 200 yards. The length of any
individual roll shall be not less than 195 yards. The roll material shall be uniformly wound on
nonreturnable cores. The inside diameter of the core shall be not less than 3 inches, with a
tolerance of plus ⅛ inch. The length of the core shall be equal to the width of the roll material,
with a tolerance of plus ⅛ inch. The core shall be rigid to prevent distortion of the roll during
use and shipment conditions. Each roll shall be restrained to prevent unwinding (see 4.3).

Sheets. When flat cut sheets are specified, the length and width shall be as specified
by the acquiring activity (see 6.2). If the length and width tolerances for cut sheets are not
specified, the tolerance for each shall be plus ¼ inch or minus ⅛ inch (see 4.3). Flat cut sheets
shall be evenly stacked (see 4.3).

Sealing. The barrier material shall exhibit no delamination of the sealed area when
sealed according to the manufacturer’s recommended conditions (see 4.5). The barrier material identification of material markings shall include the sealing conditions (see 3.6). Each roll or package (flat cuts) of barrier material shall include a tag secured to the core of rolls, or sheet inserted in the package of sheets with the sealing instructions for impulse seals and for heatsealing on rotary, band and jaw type sealing equipment. The tag or sheet shall be visible upon opening the unit package (see 4.3).

Identification of material. The barrier material shall have two groups of markings in block form and in machine direction. Group A marking shall state the specification number, type, class, manufacturer’s name, manufacturer’s designation, month and year of manufacture, lot
number and heat sealing conditions (temperature, pressure and dwell time). The letters and figures shall be clear, legible, and shall be not less than ⅛ inch high. Group B markings shall identify the protective qualities of the materials as follows:
For type I – EMI/STATIC SHIELD and for type III – STATIC SHIELD. These letters shall be not less than ½ inch high. The two groups of markings on all three types of material shall be either printed using a water-resistant ink or embossed and shall be visible if the material is fabricated into a bag or pouch. The two groups of markings shall be printed or embossed sequentially, complete, and continuous lengthwise with a space of one inch between groups. A complete group of markings shall appear once in each six inches of width of the roll and flat cut.

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