Overview
ISO/TS 16973:2016 specifies a standardized classification scheme for Respiratory Protective Devices (RPD) - excluding devices for underwater use. It defines how RPD are categorized by measurable performance attributes (protection, breathing effort, interface, filter and gas-capacity classes) and prescribes the related marking sequence. The technical specification references the relevant performance test standards rather than redefining test methods.
Key topics and technical requirements
- Modes of operation: distinguishes supplied breathable gas RPD (e.g., SCBA, airline apparatus) from filtration RPD (filters that remove particles, gases or vapours). Combined and multi‑functional RPD can have multiple classes depending on mode.
- Protection classes (PC): based on laboratory Total Inward Leakage (TIL) per ISO 16900‑1. Specified PC levels include:
- PC1 – TIL max 20%
- PC2 – TIL max 5%
- PC3 – TIL max 1%
- PC4 – TIL max 0.1%
- PC5 – TIL max 0.01%
- PC6 – TIL max 0.001%
- Work rate classes (W1–W4): classification of breathing resistance/work of breathing using ISO 16900‑12 and mapped to metabolic work classes in ISO/TS 16976‑1 (W1 light → W4 maximal).
- Respiratory interface classes: defined by coverage area (mouth-only to whole-body) and fit type (tight-fitting vs loose-fitting). Classes are coded (a–e for area, plus L/T for loose/tight).
- Supplied breathable gas capacity: self-contained RPD are designated by an “S” plus gas capacity (rounded to standard increments).
- Filter classification: particle filter efficiency and work‑rate classes, gas filter type and capacity-detailed in relevant performance standards.
- Special application classes: optional additional classification for uses such as firefighting, CBRN, marine, mining, abrasive blasting, welding and escape.
Applications and users
- Manufacturers use ISO/TS 16973 to label and market RPD consistently across jurisdictions.
- Test laboratories and conformity assessors apply the classification to interpret performance test results (TIL, filter penetration, work of breathing).
- Safety managers, procurement teams and regulatory bodies use the classification to select appropriate RPD for workplaces (industrial, firefighting, emergency response, mining, marine operations, CBRN environments).
- Useful for specifying RPD in procurement specifications, safety data sheets and training materials.
Related standards
Keywords: ISO/TS 16973:2016, Respiratory Protective Devices, RPD classification, protection class, work rate, filter class, SCBA, TIL, RPD marking, special applications.
Open preview (PDF)Respiratory protective devices — Classification for respiratory protective device (RPD), excluding RPD for underwater application
