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Hazmat suits are barrier formed of plastic, fabric and rubber, along with an independent source of oxygen. They protect workers by separating them from their hazardous environment.

Use is usually limited to short duration of up to 2 hours, depending on the difficulty of the work. Level A (united states) suits, for example, are limited by their air supply to around 1520 minutes of very strenuous work (such as a firefighting rescue in a building).

The cost of a full protective hazmat suit, according to OCHA, is us$61.48; the cost of proper training and observation by gowning experts would add more.

The color of white (W) was defined as a standard color commonly used for hazmat suits. together with standard color are: salmon pink (P), ivory (I), and light green (G).

Level A vapour-tight, providing total encapsulation and a high level of protection against direct and airborne chemical contact. They are typically worn with a self-contained breathing apparatus (SCBA) enclosed within the suit.