Difluorophosphoric acid, anhydrous

Difluorophosphoric acid is an inorganic compound with the formula HPO2F2. It is a colorless liquid. The acid has limited applications, in part because it is thermally and hydrolytically unstable.It is prepared by hydrolysis of phosphorus oxyfluoride: POF3 + H2O → HPO2F2 + HFFurther hydrolysis gives monofluorophosphoric acid: HPO2F2 + H2O → H2PO3F + HFComplete hydrolysis gives phosphoric acid: H2PO3F + H2O → H3PO4 + HFThe salts of difluorophosphoric acid are known as difluorophosphates. Wikipedia

Emergency Response Guide No. 154

Data from the Hazardous Materials Table

Source: 49 CFR §172 (2018/07)

(3) Hazard Class

Corrosive liquids

(4) Identification number Help

UN 1768

(5) Packing Group Help


(6) Labels Help

Corrosive liquids (8)

(7) Special Provisions (§172.102) Help

Special provisions may be very complex. The extracts are taken from 49 CFR §172.102. Please be careful with the information, as necessary, additional conditions may be applied that are not written here. Please check the original source and report bugs.

(8) Packing Authorizations (§173.***) Help

(8A) ExceptionsNone
(8B) Non-bulk202see 49 CFR §173.202
(8C) Bulk242see 49 CFR §173.242

(9) Quantity Limits Help

(9A) Passenger aircraft/rail1 L
(9B) Cargo aircraft only30 L

(10) Vessel stowage Help

(10A) Location
(10B) Other

Segregation Chart for Load, Transport, Storage

In this table a statement is contained for each hazard class whether the loading, transport or storage with other hazard classes is allowed, is not permitted or is restricted. The table is based on U.S.-Code 49 CFR §177.848.

red May not be loaded, transported, or stored together in the same transport vehicle or storage facility.
green Load, transport, storage together is not restricted.
yellow Load, transport, storage together is allowed under restrictions.

Substances with similar name

UN-NumberNameHazard Class
UN 1776Fluorophosphoric acid anhydrous8
UN 1782Hexafluorophosphoric acid8