Levels Of Protection

Level A (vapor or gas protection) suits are vapor-tight or gas-tight, providing total encapsulation and the highest level of protection against direct and airborne chemical contact. They are typically worn with a self-contained breathing apparatus (SCBA) enclosed within the suit. OSHA requires that Level A respirator protection be used “when chemical exposure levels present will create a substantial possibility of immediate death, immediate serious illness or injury, or impair the ability to escape.(IDLH environment)”

Level B (liquid splash protection) suits are not vapor-tight and thus provide a lesser level of protection. Level B suits are worn with an SCBA, which may be inside or outside of the suit, depending on the type of suit (encapsulating or non-encapsulating). Separate gloves and boots would be “taped” or “sealed” at the interfaces to minimize chemical penetration.  The industry will often wear fully encapsulating garments that are not “vapor tight” as Level B garments.

Level C (particle or liquid splash protection) suits include coveralls or splash suits providing a lesser level of protection than Level B and are typically worn with a respirator or gas mask only.

Level D (no hazard protection) suits do not constitute a 'hazmat suit', requiring only specific work clothing and eye (splash) protection. These suits should not be worn on any site where respiratory or skin hazards exist.  No respirator is required.