Tetrahydrofuran

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What Is Tetrahydrofuran?

Tetrahydrofuran, or THF, is a colorless liquid and a moderate polar aprotic solvent. It’s considered a heterocyclic compound that includes oxygen. This oxygen atom can accept hydrogen bonding, making the compound very water soluble.

THF can dissolve many organic compounds. It also has a low boiling point and will easily evaporate after chemical reactions.

When exposed to strong acids, THF can be polymerized into a form known as polytetramethylene ether glycol (PTMEG), which is used to make elastic fabrics.

Synonyms: THf, oxolane

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Physical and Chemical Properties

PropertyValue  

Property

Molecular Weight
Value
72.11 g/mol
 
 
 
 

Property

Density
Value
0.889 g/mL at 25ºC
 
 
 
 

Property

Boiling Point
Value
65 to 67ºC
 
 
 
 

Property

Melting Point
Value
-108ºC
 
 
 
 

Property

Flash Point
Value
-17.2ºC
 
 
 
 

Property

Viscosity
Value
0.456 at 25ºC
 
 
 
 

Property

Dielectric Constant
Value
7.52 at 22ºC
 
 
 
 

Property

Dipole Moment
Value
1.750
 
 
 
 

Property

UV Cutoff
Value
220 nm
 
 
 
 

Property

Refractive Index
Value
1.407 at 20ºC
 
 
 
 

Property

Vapor Pressure
Value
143 mm Hg (20°C)
 
 
 
 

Property

Vapor Density
Value
2.5 (vs. air)
 
 
 
 

Property

Water Solubility
Value
> 100 mg/mL at 68°F
 
 
 
 

Property

Heat of Combustion
Value
-348.8 x 105 J/kg
 
 
 
 

Property

Heat of Vaporization
Value
4.1 x 105 J/kg
 
 
 
 

Property

Surface Tension
Value
26.4 dyn/cm at 25°C
 
 
 
 

How Is Tetrahydrofuran Used?

Tetrahydrofuran is often used for small-scale laboratory experiments. It’s considered a chemical intermediate and industrial solvent. THF is a critical component of inks for polyvinyl chloride (PVC) plastics, coatings, and castings, as well as cellophane coatings.

Designations and Grades

PropertyValue  

Property

CAS Number
Value
109-99-9
 
 
 
 

Property

MDL Number
Value
MFCD00005356
 
 
 
 

Property

RIDAD/UN Number
Value
UN 2056
 
 
 
 

Property

Beilstein Registry
Value
02391
 
 
 
 

Property

EG/EC Number
Value
2037268
 
 
 
 

Property

NSC Number
Value
57858
 
 
 
 

Property

ICSC Number
Value
0578
 
 
 
 

Property

RTECS Number
Value
LU5950000
 
 
 
 

Grades

ACS/ACS Reagent/Certified ACS

Anhydrous/Dry/Extra Dry

Biochemical

Histological

HPLC/UHPLC

Laboratory/Technical

NF/USP

Sequencing

Spectrophotometry

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