Dust entry

Hydrogen fluoride aerosol

Airborne aerosol or fuming liquid exposure associated with hydrogen fluoride and hydrofluoric acid solutions.

Airborne form

aerosolvapor

The form describes what is suspended in air at the point of exposure. A material can produce more than one form, such as dust during handling and fume during heating.

Health effects

respiratory irritationcorrosive injury concernacute inhalation toxicity concern

Evidence

The NIOSH Pocket Guide describes hydrogen fluoride as a colorless gas or fuming liquid, sets a 3 ppm time-weighted-average REL and 6 ppm ceiling, and identifies hydrofluoric acid as an aqueous form requiring controls against inhalation and skin or eye exposure.

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Exposure Limits; Physical Description; Exposure Routes · 1

NIOSH REL TWA 3 ppm (2.5 mg/m³) C 6 ppm (5 mg/m³) [15-minute]. Physical Description Colorless gas or fuming liquid (below 67°F) with a strong, irritating odor. [Note: Shipped in cylinders.]

Controls

enclose HF handling and transfer
use local exhaust ventilation
exposure monitoring
prevent skin and eye contact
use appropriate acid-gas respiratory protection