Glossary / Controls & PPE
SCBA
SCBA, short for self-contained breathing apparatus, is a respirator that supplies breathable air from a cylinder carried by the wearer. It is used in oxygen-deficient or highly toxic atmospheres where filtering respirators would not protect, such as firefighting and emergency entry.
Explanation
An SCBA has a high-pressure air cylinder, a regulator, a hose and a full facepiece. Because the air comes from the tank rather than the surroundings, it does not depend on the contaminant type. That makes it suitable for unknown atmospheres, fires, and spills of highly toxic gases.
In pressure-demand mode, the facepiece stays at slight positive pressure so that leaks push air out rather than letting contaminants in. Under 29 CFR 1910.134, the SCBA pressure-demand type has an Assigned protection factor (APF) of 10,000, the highest of the common classes. Atmospheres that are immediately dangerous to life or health, as described by Immediately dangerous to life or health (IDLH), generally call for this kind of equipment, sometimes with an escape supply.
SCBA use is demanding. Cylinders hold a limited amount of air, and the actual working time depends on the wearer's breathing rate and workload. Users need medical clearance, a Respirator fit test, training in checks and emergency procedures, and regular inspection and maintenance of the equipment. It is also heavy and limits mobility.
In workplaces, SCBA is usually used by trained emergency teams rather than general staff. Plans for Confined space rescue and chemical release response should state who is trained to wear one and where units are stored. Regular Respirator programs apply to SCBA just as they do to simpler masks.
What to do and watch for
- Only trained and medically cleared people should wear SCBA.
- Inspect gauges, seals and cylinder charge on a set schedule and after each use.
- Plan entries with enough air margin for exit and a standby team.
Where it appears on an SDS
- Section 5: Fire-fighting measures. Often recommends SCBA for fire-fighters because burning the product can release hazardous gases.
- Section 8: Exposure controls / personal protection. Names SCBA or supplied air for situations such as large releases or unknown concentrations.
SDS content and wording vary by supplier. This page is general reference and does not replace the current SDS for your product.
Related terms
- Respirator
- Assigned protection factor (APF)
- Immediately dangerous to life or health (IDLH)
- Confined space
- First responder
- Respirator fit test