Difluorophosphoric acid, anhydrous

Difluorophosphoric acid is an inorganic compound with the formula HPO2F2. It is a mobile colorless strongly fuming liquid. The acid has limited applications, in part because it is thermally and hydrolytically unstable. Difluorophosphoric acid is corrosive to glass, fabric, metals and living tissue. A method to make pure difluorphosphoric acid involves heating phosphoryl fluoride with fluorophosphoric acid and separating the product by distillation: POF3 + H2PO3F → 2 HPO2F2 It is prepared by hydrolysis of phosphoryl fluoride: POF3 + H2O → HPO2F2 + HF Further hydrolysis gives fluorophosphoric acid: HPO2F2 + H2O → H2PO3F + HF Complete hydrolysis gives phosphoric acid: H2PO3F + H2O → H3PO4 + HF The salts of difluorophosphoric acid are known as difluorophosphates. Wikipedia

Hazardous Materials Table

(3) Hazard Class 8 Corrosive liquids	(4) Identification number UN 1768	(5) Packing Group II
(6) Labels
(7) Special Provisions (§172.102) ×Note: 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. A7 Steel packagings must be corrosion-resistant or have protection against corrosion. Browse special provision A7 B2 MC 300, MC 301, MC 302, MC 303, MC 305, and MC 306 and DOT 406 cargo tanks are not authorized. Browse special provision B2 IB2 Authorized IBCs: Metal (31A, 31B and 31N); Rigid plastics (31H1 and 31H2); Composite (31HZ1). Additional Requirement: Only liquids with a vapor pressure less than or equal to 110 kPa at 50 °C (1.1 bar at 122 °F), or 130 kPa at 55 °C (1.3 bar at 131 °F) are authorized. Browse special provision IB2 N5 Glass materials of construction are not authorized for any part of a packaging which is normally in contact with the hazardous material. Browse special provision N5 N34 Aluminum construction materials are not authorized for any part of a packaging which is normally in contact with the hazardous material. Browse special provision N34 T8 Minimum test pressure (bar) 4 Minimum shell thickness § 178.274(d)(2) Pressure-relief requirements Normal Bottom opening requirements Prohibited Browse special provision T8 TP2 a. The maximum degree of filling must not exceed the degree of filling determined by the following: Where: tr is the maximum mean bulk temperature during transport, tf is the temperature in degrees celsius of the liquid during filling, and α is the mean coefficient of cubical expansion of the liquid between the mean temperature of the liquid during filling (tf) and the maximum mean bulk temperature during transportation (tr) both in degrees celsius. b. For liquids transported under ambient conditions α may be calculated using the formula: Where: d15 and d50 are the densities (in units of mass per unit volume) of the liquid at 15 °C (59 °F) and 50 °C (122 °F), respectively. Browse special provision TP2
(8) Packing Authorizations (§173.***) (8A) Exceptions 154 see 49 CFR §173.154 (8B) Non-bulk 202 see 49 CFR §173.202 (8C) Bulk 242 see 49 CFR §173.242
(9) Quantity Limits (9A) Passenger aircraft/rail 1 L (9B) Cargo aircraft only 30 L
(10) Vessel stowage (10A) Location A Stowage category “A” means the material may be stowed “on deck” or “under deck” on a cargo vessel or on a passenger vessel. Source: 49 CFR §172.101(k) (10B) Other 40 see 49 CFR §176.84 53 see 49 CFR §176.84 58 see 49 CFR §176.84 Source: 49 CFR §176.84

Segregation chart for load, transport, and storage

This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.

Note: In this segregation and separation chart are HazMat of hazard class 8 considered depending if there are liquid. Currently HazMat Tool is not able to to check if a HazMat is liquid or not. Therefore it is assumed as liquid. See PHMSA Interpretation #09-0252.

Add to my HazMat & segregation check

Hazard class	8	7	6.1	5.2	5.1	4.3	4.2	4.1	3	2.3B	2.3A	2.2	2.1	1.6	1.5	1.4	1.3	1.1/1.2
1.1/1.2
1.3
1.4
1.5
1.6
2.1
2.2
2.3A
2.3B
3
4.1
4.2
4.3
5.1
5.2
6.1
7
8

	Must not be loaded, transported, or stored together in the same vehicle or facility.
	May be loaded, transported, or stored together.
	May be loaded, transported, or stored together only with restrictions.