Blackout/IR Signal/Thermal Load
Blackout, infrared signature, and thermal load are very closely related attributes in soft-sided emergency shelters. Warwick provides a number of options for tent designers addressing these three parameters.
These laminates allow you to customize solutions to meet specific requirements. One option offers improved functionality obtained using a two-layer approach of tent skin and thermal liner.
This provides improved durability and thermal management with the option to remove the thermal layer as required. Another material integrates blackout and IR signature into a single laminate.
This approach offers simplicity in bonding, thermal management, system durability, and low packing volume. Another option is a three-ply system consisting of a solar fly, tent wall, and thermal liner. This emergency shelter system significantly reduces thermal load.
Fielding requirements of protective tents and emergency shelters demand laminates that maintain their chemical and biological protection, tensile strength, and overall integrity throughout the life of the tent. Even after repetitive erecting and striking, decontamination, exposure to abrasion, UV and weathering, our laminates are designed to resist pinholing, tearing, and delamination.
In addition to standard test methods, we have developed new methods and apparatus to test laminate durability, including a dynamic sheer for stress/strain measurement that our laminates have successfully completed past 100,000 cycles.
Interply Peel Strength
The integrity and durability of any laminate is only as good as the interfacial strength of adhesion between each layer. Warwick is a world leader in the development, engineering, and testing of adhesive systems for multilayer laminates.
Unlike general purpose tent or shelter materials, an integrated chem-bio laminate consists of many different layers and needs to deliver high interply strength in order to support its specific operational requirements during serious threats and emergency situations.
In order to accommodate various tensile requirements, we have engineered a low-mass substrate using high-strength yarns in combination with flame retardant in-fill fiber. This solution allows us to offer a substrate that delivers the highest tensile performance required.
As with any shelter structure, flame resistance is crucial. Flammability is a multifaceted problem within a laminate system—each layer brings different flame loads with complex interactions within the combustion cell. Warwick has engineered a flame retardant system that considers both the individual components and the total system's flame load.
Vertical Flame Test ASTM D6413
The specimen is exposed to an open flame for 12 seconds, after which the flame source is removed. Then the specimen is observed and timed for how long it continues to flame. In order to pass this test, the sample must self extinguish within a specified time. In addition, the char length is measured and must not exceed a specified length.
As you can see with the material sample on the right, our laminates self extinguish, have low char length, retain structure, and therefore pass vertical flame tests.
Warwick's chem-bio TurtleSkin materials are designed from inception to incorporate the highest levels of flame retardant performance. This material self-extinguishes in less than two seconds, has a consumption level of less than one 1.5 inches, and will not melt or drip.
This performance has been verified in both humid and very low humidity conditions.
In addition to this base performance, the laminate character of this material does not absorb hydrocarbons that may be present in aircraft emergencies, which further reduces the risk of burn-through from fuel-induced flame load upon the garment. A key behavior in personnel protection is preventing direct flame contact with the user's skin.
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