UN/NA Number Reference
DOT Class 6.1 Toxic Substance placard

UN 1690: Sodium fluoride, solid

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1690 is assigned the proper shipping name Sodium fluoride, solid in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 6.1 Toxic Substance material, Packing Group III. Required label(s): 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 154)

Hazards: TOXIC. Corrosive. Non-combustible but may decompose producing toxic fumes when heated.

Fire: Use agent appropriate for surrounding fire. Cool containers.

Spill: Do not touch. Avoid inhalation. Use water spray to reduce fumes.

Chemical and Physical Properties

Sodium fluoride is a colorless crystalline solid or white powder, or the solid dissolved in a liquid. It is soluble in water. It is noncombustible. It is corrosive to aluminum. It is used as an insecticide. It is also used to fluorinate water supplies, as a wood preservative, in cleaning compounds, manufacture of glass, and for many other uses.

CAS Number: 7681-49-4
Molecular Formula: FNa
Molecular Weight: 41.9881724 g/mol
Color / Form: Colorless, cubic or tetragonal crystals
Odor: Odorless
Boiling Point: 3083 F
Melting Point: 1819 °F (NTP, 1992)
Autoignition: Not flammable (USCG, 1999)
Specific Gravity: 2.79 (sinks in water)
Vapor Pressure: 1 mmHg at 1971 F
Water Solubility: 10 to 50 mg/mL at 73 F
pH: 7.4 (Freshly prepared saturated soln)

Regulatory Data

CERCLA RQ (40 CFR 302.4)
1000 lb
OSHA PEL
TWA 2.5 mg/m 3 [*Note: The PEL also applies to other inorganic, solid fluorides (as F).]
NIOSH REL
TWA 2.5 mg/m 3 [*Note: The REL also applies to other inorganic, solid fluorides (as F).]
IDLH
250 mg/m 3 (as F)

A release of this material at or above its CERCLA reportable quantity (1000 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: IB8, IP3, T1, TP33. 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 1690 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.