UN/NA Number Reference

UN 1052: Hydrogen fluoride, anhydrous

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1052 is assigned the proper shipping name Hydrogen fluoride, anhydrous in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 8 Corrosive material, Packing Group I. Required label(s): 8, 6.1.

Packing group indicates the degree of danger within a hazard class: PG I is high danger, PG II medium, PG III low. The proper shipping name, hazard class, UN number, and packing group together form the basic shipping description that must appear on shipping papers and, where required, on the package and placard.

Emergency Response (ERG Guide 125)

Hazards: TOXIC. Corrosive. Causes burns. May be fatal if inhaled. Vapors heavier than air.

Fire: Use water spray or fog. Do not get water inside containers.

Spill: Fully encapsulating suit required. Stop leak if safe. Use water spray.

Chemical and Physical Properties

Hydrofluoric acid, solution appears as a colorless fuming mobile aqueous solution with a pungent odor. Corrosive to metals and tissue. Highly toxic by ingestion and inhalation. Exposure to fumes or very short contact with liquid may cause severe painful burns; penetrates skin to cause deep-seated ulceration that may lead to gangrene.

CAS Number: 7664-39-3

Molecular Formula: FH

Molecular Weight: 20.0064 g/mol

Color / Form: Colorless gas, fumes in air

Odor: ... Strong, irritating odor ...

Boiling Point: 152 F

Melting Point: -92.2 °F for 70% solution (ICSC, 2024)

Flash Point: Not Flammable

Autoignition: Not flammable (USCG, 1999)

Specific Gravity: 1.23 for 70% solution

Vapor Pressure: 150 mmHg at 77 F (partial pressure for 70% solution)

Vapor Density: 1.86 (heavier than air)

Water Solubility: Miscible

Log P: 0.23 (estimated)

pH: In water a weak acid

Regulatory Data

CERCLA RQ (40 CFR 302.4)

100 lb

EPCRA TPQ (40 CFR 355)

100 lb

OSHA PEL

See Annotated Z-2 See Annotated Z-2 HYDROGEN FLUORIDE - ACGIH

NIOSH REL

TWA 3 ppm (2.5 mg/m 3 ) C 6 ppm (5 mg/m 3 ) [15-minute]

IDLH

30 ppm

RCRA Waste Code(s)

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A release of this material at or above its CERCLA reportable quantity (100 lb) requires immediate notification to the National Response Center at 800-424-8802.

Special Provisions

49 CFR 172.102 special provision codes for this entry: 3, B7, B46, B77, N86, T10, TP2. These codes modify the general requirements (packaging, quantity limits, exceptions) for this specific material. Look up each code in 49 CFR 172.102 for the full text.

Need the full interactive record? Open UN 1052 in the SpillNerd lookup tool for the live database entry with placard graphics, GHS pictograms, full segregation tables, and synonym search. For another material, use the UN number and chemical lookup.

Reference data compiled from the DOT Hazardous Materials Table (49 CFR 172.101), the 2024 Emergency Response Guidebook, and public chemical databases (PubChem, NIOSH, EPA). Always verify the correct shipping description against the current regulation and the manufacturer's SDS Section 14 before shipping.