MIL-PRF-32504
4.5.5 Shelter weather barrier fabric: Fabric and fabric panel components shall meet or exceed all
requirements listed in Table II, Fabric Requirements, prior to Accelerated Weather Test AATCC Method
169, Xenon exposure or UV exposure test. After initial testing, the shelter materials shall show no
evidence of structural damage, degradation or permanent deformation. After performance of accelerated
weathering test AATCC Method 169 (Xenon) or UV effects testing, the weather barrier fabric shall show
no signs of performance degradation in Breaking Strength, Coating Adhesion, Tongue Tear, Grab or Strip
Tensile, Flame Resistance or Dead Load Capacity.
4.5.5.1 Flammability verification/demonstration: Test all fabric components (weather barrier, insulated
liner, if applicable) per NFPA 751. All fabric shall be self-extinguishing. There shall be no flaming melt
drip or molten pieces of fabric at any time.
4.5.5.2 Hardware and findings color: Visually inspect all external hardware, fittings and findings are
absent polished or light reflective surfaces.
4.5.5.2.1 Shelter color inspection: Visually inspect the exterior shelter color for similarity to the
standard sample color of the shelter, as specified by the contract. Verify that no shiny or light reflective
components are visible on the shelter exterior.
4.5.6 Interior shelter environment:
4.5.6.1 Ventilation Verification and Demonstration: Demonstrate that the ECU ventilation ducts
properly interface with the fabric duct openings. Ensure that ducts are properly supported and that the
joint is weather resistance and satisfies blackout requirements. Demonstrate that shelter mounted
ventilation fans are properly switched and operational. Examine any passive ventilation venting features
for self-operation and that they satisfy blackout requirements.
4.5.6.2 Odors verification: Satisfy one odor criteria and one toxicity criteria.
4.5.6.2.1 Odors measurements: After completing each of the operating environment tests, a panel of
three inspectors performs the odors test. If any one inspector detects any smell, persisting after 15
seconds, classified as nauseous, repellent, burning, strongly penetrating, drying nasal passages causing
dizziness, sneezing or any adverse reaction, the results are not acceptable. Aromatic odors usually
associated with specific types of vinyl compounds are not objectionable.
4.5.6.2.2 Alternative odors analysis: Demonstrate, by analysis, the shelter materials and manufacturing
processes do not result in a product that can produce noxious odors.
4.5.6.2.3 Toxicity measurements: Demonstrate the shelter does not produce dangerous toxic exposures
by meeting published chemical threshold limit values. Acceptable limits are any one of the following:
OSHA Permissible Exposure Limits Table One or the NIOSH Pocket Guide to Chemical Hazards,
Exposure Limits and Signs/Symptoms of Exposure.
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