The Water Threat: For Aramid fibers (e.g., Kevlar®), water is a primary enemy. When wet, the fibers can lose a significant portion of their tensile strength. This is why all soft armor is water-proofed within a sealed carrier. NIJ tests require wet conditioning to simulate this.
UV Degradation: Prolonged exposure to ultraviolet light (sunlight) breaks down the molecular structure of both Aramid and polyethylene fibers, making them brittle and weak. Armor should always be stored in the dark and kept in its carrier when not in use.
Temperature Extremes: Extreme cold can make some materials brittle. Extreme heat (e.g., left in a car trunk) can cause the laminates in hard plates to delaminate and the resins in ceramics to soften. Most armor has an operational temperature range specified by the manufacturer.
Chemical Exposure: Harsh chemicals, solvents, oils, and even insect repellent can break down the protective fibers and the water-proofing coatings. Armor should be protected from any contact with such substances.
