IMPAK CORPORATION

MIL-PRF-131K Grade 1000m

IMPAK Corporation's MIL-PRF-131K Grade 1000m is a super heavy duty, foil-based, moisture barrier laminate that is QPL listed and approved for conversion into pouches, blankets, and drum liners. It's construction has been designed to resist punctures and tearing as well as to minimize forms of contamination including outgassing and non-volatile residues. It is waterproof, greaseproof, flexible, heat-sealable and is specially designed for packaging large machinery and equipment. Grade 1000M is the highest quality �MIL-B-131� material in the marketplace.

This moisture barrier film is on the QPL for MIL-PRF-131K and is converted in accordance with MIL-DTL-117H.

Features:

QPL listed as of February 10th, 2017
Superior chemical resistance.
Very high puncture and tear resistance.
Technically superior to ALL �MIL-B-131� structures produced with a Tyvek layer.
Ultimate heavy duty barrier packaging
Linear low density Polyethylene inner sealant layer for easy sealability.
Low MVTR. Protects against damage caused by humidity, moisture, oxygen, odors, and other airborne contaminants.
Lightweight and puncture resistant.
Conforms to the shape of products during vacuum packaging easily.
Suitable for vacuum packaging applications requiring nitrogen flushing.
Class 100 clean room production
Date and lot coded for traceability.
Thermal transfer identification print is standard.
Available in zipper, side and bottom gusset configurations

Specifications

Physical Properties	Test Method	US Std.
Thickness - Average	ASTM D374	6.2 mil.
Yield		4235in²/lb
Tensile Strength MD - Average TD - Average	ASTM D882	7687 psi 7687 psi
Graves Tear MD - Average TD - Average	ASTM D1004	4.5 lbs. 4.5 lbs.
Spencer Impact - Average	ASTM D3420	15.0 lbs.
Puncture Resistance	FTMS 101C Method 2065	31.0 lbs.
Moisture Vapor Transmission Rate	ASTM F1249 (37.8°C, 90% RH)	0.0005 g/100in²/day
Oxygen Gas Transmission Rate	ASTM F1249 (23.0°C, 0% RH)	0.0005 g/100in²/day
Heat Seal Range	ASTM F88	275°F - 500°F
Seal Strength - Minimum (200°C, 1s, 4 bar)	ASTM F88	>18.0 lbs

IMPAK CORPORATION makes no warranty, expressed or implied, as to the suitability of these materials for any specific use. The values shown above were developed from random samples taken from production material. We believe them to be typical for the product. Actual values may vary somewhat from those depicted here. Customers should determine product suitability based upon their own internal criteria.

Last Revised 2026