HYDROGEN FLUORIDE
Anhydrous
Technical Data Sheet
HYDROGEN FLUORIDE
ANHYDROUS
CHEMICAL ANALYSIS
CHEMICAL ANALYSIS
SPECIFICATION
TYPICAL ANALYSIS
HF, %
99.96 minimum
99.99
SO2, ppm
50 maximum
<5
H2SiF6, ppm
50 maximum
<25
Fe, ppm
10 maximum
<3
Residue on Ignition, ppm
50 maximum
20
10 maximum
<2
100 maximum
<30
10 maximum
<3
(non-volatile acid as H2SO4)
As, ppm
H2O, ppm
(1)
Cl, ppm
(1)
Conductivity Method
Anhydrous hydrogen fluoride is a dangerous chemical when handled improperly. For safety information and handling
recommendations, please contact Solvay Fluorides at www.solvaychemicals.us.
PHYSICAL PROPERTIES
Anhydrous hydrogen fluoride (AHF) is a colorless liquid corrosive, and has a sharp and penetrating odor. AHF vapor
reacts with the moisture in the atmosphere to form a visible dense cloud.
Hydrofluoric acid in liquid or vapor form is extremely dangerous and burns skin, eyes and mucous membranes. ANY
exposure requires immediate first aid and medical attention. For further information on first aid and medical
procedures, request our current publication.
Solvay Fluorides, LLC
AHF #3324 05/2014
Copyright 2005-2014
All Rights Reserved
1.800.765-8292
www.solvaychemicals.us
HYDROGEN FLUORIDE
Anhydrous
Technical Data Sheet
Boiling Point (760 mm Hg)
Freezing Point
ºC
19.5
Critical Density, g/mL
0.29
ºF
67.1
Critical Volume, mL/g·mol
69.0
ºC
-83.5
Specific Heat,
ºF
-118.3
Vapor Pressure, 25º C (77º F) mm Hg
psia
37.8º C (100º F) mm Hg
Density Liquid,
912.0
17.6
Liquid 0º C (32º F)
cal/g·º C (Btu/lb·º F)
Kj/Kg·º K
0.61
2.55
Vaporization heat, at boiling point
1410.0
cal/g
81.0
psia
27.3
BTU/lb
146.0
kpa
188.0
KJ/kg
340.0
25
0º C (32º F)
3
Refraction index, n
g/mL (T/m )
1.015
lb/gal
8.47
1.157
D
Surface Tension at Boiling Point
Viscosity 0º C (32º F),
cP (mPa·s)
0.26
10º C (50º F),
cP (mPa·s)
0.23
Dielectric Constant, 0º C (32º F),
83.6
ºC
188.0
Conductivity, 0º C (32º F), mhos/cm
<1.6 x 10
ºF
370.4
atm
64.0
MPa
6.48
Critical Temperature
Critical Pressure
Dinas/cm (mN/m)
S/m
8.6
-6
-4
<1.6 x 10
.
CHEMICAL PROPERTIES
Hydrofluoric acid reacts with metals located up to hydrogen in the Electrochemical Table of Metals to form fluoride
salts. It also reacts with metal carbonates, oxides and hydroxides.
Tetra silicon fluoride and fluorosilicic acid are formed when hydrofluoric acid reacts with silicon and silicic acid.
Hydrofluoric acid attacks glass. HF aqueous solutions are better handled in the laboratory using polyethylene and
polypropylene containers.
Anhydrous hydrogen fluoride reacts with olefins to produce organic fluorides and with halogenated organic
compounds to produce fluorinated organic compounds. AHF forms stable complexes with metallic fluorides and also
acts as a catalyst in reactions that involve formation of carbon-carbon links.
Hydrofluoric acid may produce considerable heat when it is diluted into water and requires a cooling process for
preparation of dilutions.
Solvay Fluorides, LLC
AHF #3324 05/2014
Copyright 2005-2014
All Rights Reserved
1.800.765-8292
www.solvaychemicals.us
HYDROGEN FLUORIDE
Anhydrous
Technical Data Sheet
Hydrogen fluoride forms a constant boiling point mixture with water at 37.73 weight percentage and 111.4º C (232º
F).
EXPLOSION OR FIRE DANGER
Hydrofluoric acid is not flammable but is difficult to contain since it corrodes many substances.
AHF corrosive action with moisture present could result in formation of hydrogen gas in pipelines and metallic
containers. Hydrogen accumulation represents a fire or explosion danger. Potential ignition sources (sparks or flame)
are not allowed in the areas where equipment is located that contains hydrofluoric acid.
CONSTRUCTION MATERIALS
The appropriate selection of construction material to be used with Hydrofluoric acid is decided according to operation
conditions and variables that affect corrosion. Temperature, pressure, moisture and velocity, aeration and impurities
are factors that determine material selection. Each application of storage and handling must be studied carefully
before specifying the materials.
Anhydrous Hydrofluoric Acid - Ductile steel totally passivated (de-oxidized) is generally satisfactory for AHF storage
and handling at temperatures up to 150º F (66º C). Hydrogen blistering could occur if the plates contain inclusions.
a
De-sulphurized steels (0.10% maximum S) have less probabilities of blistering. For higher temperatures, MONEL
b
c
and HASTELLOY may be acceptable. Fluorocarbon resins TEFLON TFE and FEP are resistant to all hydrofluoric
acid concentrations up to 500º F (260º C) and 400º F (204º C), respectively.
b
a
For pumps used at ambient temperature ALLOY 20, HASTELLOY and MONEL may be acceptable.
Steel should not be used for close fitting moving parts because the corrosive film will shorten the tolerances and
cause their immobilization. Do not use forged steel, stainless steel class 400 or hardened steels for AHF service.
a
Hardened MONEL is conducive to corrosion cracking if air moisture is in contact with AHF or if a substantial aeration
occurs. Copper and its alloys are not recommended when flows are at high velocity.
a
Reg. U.S. Pat & Tm. Off., International Nickel Company
Reg. U.S. Pat & Tm. Off., Cabot Corporation
c
Reg. U.S. Pat & Tm. Off., DuPont Company; manufactured only by DuPont
Some information provided by Quimica Fluor, S.A. de C.V., Mexico City, Mexico
b
SHIPPING CONTAINERS
Solvay Fluorides ships bulk anhydrous hydrofluoric acid in railcars and trucks that meet US Department of
Transportation (DOT) specifications. The equipment is selected based on the size of the shipment requested to
accommodate different volumes up to the legal maximum railway or highway load limits.
DOT AND FREIGHT DESCRIPTION
Hazardous Material Description
Hydrogen fluoride, anhydrous
Haz. Mat. Class, I.D.#, Packing Group
8, UN 1052, PG I, Poison – Inhalation Hazard
Freight Classification
Anhydrous Hydrofluoric Acid
Principal CAS Number
7664-39-3
RQ
100 lb.
Placard
Corrosive/Subsidiary – Poison Inhalation Hazard (toxic)
Label
Corrosive/Subsidiary Poison (toxic)
Solvay Fluorides, LLC
AHF #3324 05/2014
Copyright 2005-2014
All Rights Reserved
1.800.765-8292
www.solvaychemicals.us
HYDROGEN FLUORIDE
Anhydrous
Technical Data Sheet
Before using, read Safety Data Sheet (SDS) for this chemical.
Solvay Fluorides, LLC
®
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To our actual knowledge, the information contained herein is accurate as of the date of this document. However,
neither Solvay Fluorides, LLC, nor any of its affiliates, makes any warranty, express or implied, or accepts any liability
in connection with this information or its use. This information is for use by technically skilled persons at their own
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use and whether any patents are infringed. This information gives typical properties only and is not to be used for
specification purposes. Solvay Fluorides, LLC reserves the right to make additions, deletions or modifications to the
information at any time without prior notification.
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registered trademarks of Solvay Fluorides, LLC or its affiliates, unless otherwise indicated.
Before using, read the Safety Data Sheet (SDS) for the chemical.
Solvay Fluorides, LLC
AHF #3324 05/2014
Copyright 2005-2014
All Rights Reserved
1.800.765-8292
www.solvaychemicals.us