o-Terphenyl

Synonym(s):1,2-Diphenylbenzene;o-Terphenyl

CAS NO.：84-15-1
Empirical Formula: C18H14
Molecular Weight: 230.3
MDL number: MFCD00003055
EINECS: 201-517-6
SAFETY DATA SHEET (SDS)
Update Date: 2023-12-24 21:24:35

What is o-Terphenyl?

Chemical properties

White crystalline

The Uses of o-Terphenyl

Terphenyl mixtures are used industrially as heat storage and transfer agents, as textile dye carriers, and as intermediates in the production of nonspreading lubricants. Contemporary use of o-Terphenyl is found in solar-heating systems. It is used as a plasticizer for polystyrene for thermoplastic recording.

General Description

Colorless or light-yellow solid. Mp 58-59°C; bp: 337°C. Density: 1.16 g cm-3. Insoluble in water. Usually shipped as a solid mixture with its isomers m-terphenyl and p-terphenyl that is used as a heat-transfer fluid.

Reactivity Profile

O-TERPHENYL is non-flammable but combustible (flash point 339°F). Extremely stable thermally. Incompatible with strong oxidizing agents but not very reactive at room conditions.

Hazard

Combustible. Eye and upper respiratory tract irritant.

Safety Profile

Moderately toxic by ingestion. Combustible when exposed to heat or flame. To fight fire, use water, CO2, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes.

Purification Methods

Crystallise o-terphenyl from EtOH. Also purify it by chromatography of CCl4 solution on alumina, with pet ether as eluent, followed by crystallisation from pet ether (b 40-60o) or pet ether/*C6H6. It also distils under vacuum. [Beilstein 5 III 2292, 5 IV 2478.]

Properties of o-Terphenyl

Melting point:	56-59 °C (lit.)
Boiling point:	337 °C (lit.)
Density	1,1 g/cm³
vapor pressure	<1 Pa (25 °C)
refractive index	1.5500 (estimate)
Flash point:	>230 °F
storage temp.	Store below +30°C.
solubility	1.24mg/l
form	Fluid
color	White to Almost white
Water Solubility	Insoluble in water. Solubility in toluene is almost transparent. Sparingly soluble in lower alcohols and glycols; very soluble in common aromatic solvents.
λmax	233nm(Cyclohexane)(lit.)
BRN	1908446
Exposure limits	NIOSH: IDLH 500 mg/m3; Ceiling 0.5 ppm(5 mg/m3)
CAS DataBase Reference	84-15-1(CAS DataBase Reference)
EPA Substance Registry System	o-Terphenyl (84-15-1)

Safety information for o-Terphenyl

Signal word	Danger
Pictogram(s)	Skull and Crossbones Acute Toxicity GHS06 Environment GHS09
GHS Hazard Statements	H302:Acute toxicity,oral H319:Serious eye damage/eye irritation H331:Acute toxicity,inhalation H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P273:Avoid release to the environment. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.