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Description

o-terphenyl · CAS 84-15-1 · C18H14. UNII W5675R7KVW. Boiling Point: 630 °F at 760 mmHg (NIOSH, 2024); Boiling Point: 332 °C AT 760 MM HG; Boiling Point: 332 °C.

Identification

CAS Registry Number	84-15-1
PubChem CID	6766
Molecular formula	C18H14
IUPAC name	1,2-diphenylbenzene
UNII (FDA)	W5675R7KVW

Computed Descriptors

Molecular Weight	230.3
XLogP3	6
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	0
Rotatable Bond Count	2
Exact Mass	230.109550447
Monoisotopic Mass	230.109550447
Topological Polar Surface Area	0
Heavy Atom Count	18
Formal Charge	0

Physical & Chemical Properties

Boiling Point	630 °F at 760 mmHg (NIOSH, 2024)
Boiling Point	332 °C AT 760 MM HG
Boiling Point	332 °C
Boiling Point	630 °F
Melting Point	136 °F (NIOSH, 2024)
Melting Point	56.2 °C
Melting Point	136 °F
Flash Point	325 °F (NIOSH, 2024)
Flash Point	163 °C
Flash Point	325 °F (163 °C) (OPEN CUP)

Physical description & handling notes

• O-terphenyl appears as colorless or light-yellow solid. mp: 58-59 °C, bp: 337 °C. Density: 1.16 g/cm3. 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.
• Liquid
• Colorless or light-yellow solid; [NIOSH]
• COLOURLESS-TO-LIGHT-YELLOW CRYSTALS.
• Colorless or light-yellow solid.
• MONOCLINIC PRISMS FROM METHANOL

GHS Hazard Classification

Reported hazard statements	H302 (100%), H315 (84.5%), H319 (84.5%), H335 (91.4%), H400 (74.1%), H331

Documented Uses

• Terphenyl mixtures are used as heat transfer media, dye carriers, and in the production of lubricants; [ACGIH]
• Terphenyl mixtures are used industrially as heat storage and transfer agents, as textile dye carriers, and as intermediates in the production of nonspreading lubricants. From 1960-1970, technical grade terphenyls were used as coolants for nuclear reactors, whereas contemporary use has been in solar-heating systems. /Terphenyl mixtures/
• o-Terphenyl is used as a plasticizer for polystyrene for thermoplastic recording.
• Terphenyls are byproducts in the production of biphenyl by dehydrocondensation of benzene; they are found in the high-boiling fraction of the pyrolysis products. o-Terphenyl is readily separated from the terphenyl isomer mixture by distillation.
• All Other Basic Organic Chemical Manufacturing
• IT /TERPHENYL/ OCCURS NATURALLY IN PETROLEUM OIL. ...3 CHEMICAL ISOMERS...OF WHICH ORTHO & PARA FORMS APPEAR INDUSTRIALLY MOST PREVALENT. /TERPHENYLS/

Synonyms

O-TERPHENYL; 84-15-1; 1,2-Diphenylbenzene; 1,1':2',1''-Terphenyl; ortho-terphenyl; 2-Phenylbiphenyl; 1,1'-Biphenyl, 2-phenyl-; CCRIS 1655; DTXSID1049697; HSDB 2538; NSC 6809; EINECS 201-517-6; W5675R7KVW; AI3-01402; NSC-6809; TERPHENYL, O-

Frequently Asked Questions

What are the CAS number and molecular formula of o-terphenyl?

CAS 84-15-1; molecular formula C18H14; molecular weight — g/mol.

What other names is o-terphenyl known by?

O-TERPHENYL, 84-15-1, 1,2-Diphenylbenzene, 1,1':2',1''-Terphenyl, ortho-terphenyl, 2-Phenylbiphenyl.

Is o-terphenyl classified as hazardous?

Hazard statements reported: H302, H315, H319, H335, H400.

What are the key physical properties of o-terphenyl?

Boiling Point: 630 °F at 760 mmHg (NIOSH, 2024); Boiling Point: 332 °C AT 760 MM HG; Boiling Point: 332 °C; Boiling Point: 630 °F.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.