Acid Gas Cartridge
Which gases are typically covered by a standard acid gas cartridge?
Standard AG cartridges (e.g., 3M 6002) typically cover hydrogen chloride (HCl), chlorine (Cl₂), sulfur dioxide (SO₂), and hydrogen fluoride (HF). Some models also include hydrogen bromide (HBr). Hydrogen cyanide (HCN) and hydrogen sulfide (H₂S) often require specific cartridges or supplied-air solutions.
What protection factors apply when using AG cartridges with half-mask vs full-face respirators?
For air-purifying respirators with AG cartridges, half-mask APRs have an assigned protection factor (APF) of 10, while full-face APRs have an APF of 50. The APF must exceed the hazard ratio (exposure concentration divided by OEL) for safe use.
How are AG cartridge change-out schedules technically determined?
Change-out schedules are based on breakthrough time calculations considering challenge gas concentration, airflow rate, temperature, humidity, and cartridge sorbent mass. Manufacturers provide service-life software or tables; employers must use worst-case assumptions, apply safety factors (50-80% of predicted breakthrough), and document the schedule in the respirator program.
An acid gas cartridge is a replaceable respirator component containing impregnated activated carbon that removes inorganic acid gases and vapours such as chlorine, hydrogen chloride, sulfur dioxide, hydrogen fluoride, and hydrogen bromide from breathing air. It is NIOSH/CSA-certified for use with air-purifying respirators in sub-IDLH atmospheres, distinct from organic vapour cartridges.
On manufacturing shop floors, acid gas cartridges are used in water treatment (chlorine, sulfur dioxide), chemical manufacturing (HCl, SO₂), metal finishing (HCl, HF), semiconductor fabrication (HF, HCl), and laboratories. Employers identify specific gases via SDSs and air monitoring, select appropriate cartridges (e.g., AG/P100 for combined hazards), and implement change-out schedules based on breakthrough calculations. Workers are trained on hazard recognition and cartridge limitations, with respirator programs including fit testing and medical evaluations per WorkSafeBC Part 8 and OSHA 1910.134.
Using AG cartridges in IDLH or unknown concentration atmospheres, where SCBA or supplied-air respirators are required, leading to rapid breakthrough and severe health risks.
Selecting incorrect cartridge type (e.g., OV-only for acid gases or AG-only for organic vapours), failing to match the specific hazard as per SDS and air monitoring, resulting in inadequate protection.
Lack of documented change-out schedule or expiry control, with cartridges used beyond service life or stored improperly, causing unseen breakthrough and non-compliance with OSHA and WorkSafeBC requirements.