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Qualitative Fit Testing (QLFT)
The standard pass/fail method used primarily for disposable N95 masks and half-face elastomeric respirators.
How it works
Qualitative testing relies on the user's senses (taste, smell, or irritation) to detect leakage around the respirator seal. A test agent is introduced while the user wears the mask inside a hood.
If the user can taste or smell the agent, the mask does not fit properly and fails the test.
Common Testing Agents
- ✓SaccharinA sweet-tasting aerosol
- ✓Bitrex (Denatonium Benzoate)A bitter-tasting aerosol
- ✓Isoamyl Acetate (IAA)A banana-smelling agent (requires specific cartridges)
When to use Qualitative Testing
Healthcare
Ideal for N95 and surgical masks used in hospitals and clinics.
General Industry
Perfect for half-mask elastomeric respirators filtering dust and particulates.
Large Volumes
The fastest method for testing large groups of employees efficiently.
Not sure which test you need?
We can help you determine the right testing method for your specific workplace hazards and respirator types.