Terphenyl

Description

Terphenyl · CAS 26140-60-3 · C18H14. UNII WOI2PSS0KX. Boiling Point: 689 °F at 760 mmHg (NIOSH, 2024); Boiling Point: 363 °C AT 760 MM HG; Boiling Point: 630 °F.

Identification

CAS Registry Number	26140-60-3
PubChem CID	7076
Molecular formula	C18H14
IUPAC name	1,3-diphenylbenzene
UNII (FDA)	WOI2PSS0KX

Computed Descriptors

Molecular Weight	230.3
XLogP3	5.6
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	689 °F at 760 mmHg (NIOSH, 2024)
Boiling Point	363 °C AT 760 MM HG
Boiling Point	630 °F
Boiling Point	689 °F
Melting Point	192 °F (NIOSH, 2024)
Melting Point	87 °C
Melting Point	192 °F
Flash Point	375 °F (NIOSH, 2024)
Flash Point	191 °C
Flash Point	375 °F (191 °C) (OPEN CUP)

Physical description & handling notes

• M-terphenyl is a yellow solid. mp: 86-87 °C, bp: 365 °C. Density: 1.195 g/cm3. Insoluble in water. Usually shipped as a solid mixture with its isomers o-terphenyl and p-terphenyl that is used as a heat-transfer fluid.
• Liquid; Other Solid
• Liquid
• Yellow solid (needles); [NIOSH]
• Colorless or light-yellow solid.
• Yellow solid (needles).

Regulatory Status

Regulatory & Food Contact	FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS
GHS notification summary	6.2% (3 / 48)

GHS Hazard Classification

GHS notification summary	6.2% (3 / 48)
Reported hazard statements	H317 (13.6%), H400 (91.2%), H410 (99.9%), H315 (93.8%), H319 (93.8%), H335 (91.7%)

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/
• Partially hydrogenated terphenyl is used mainly as a dye carrier for pressure sensitive recording materials and copy paper, and as a heat transfer oil.
• Terphenyls are byproducts in the production of biphenyl by dehydrocondensation of benzene; they are found in the high-boiling fraction of the pyrolysis products. The o-derivative is readily separated from the terphenyl isomer mixture by distillation; m- and p-terphenyl distill together and the pure isomers can be obtained by zone refining.
• 2023: 10,000,000 - <50,000,000 lb
• 2022: 10,000,000 - <50,000,000 lb

Synonyms

M-TERPHENYL; 1,3-Diphenylbenzene; 1,1':3',1''-Terphenyl; 92-06-8; m-Diphenylbenzene; m-Triphenyl; 1,3-Terphenyl; Isodiphenylbenzene; Terphenyls; meta-terphenyl; 3-Phenylbiphenyl; 1,1'-Biphenyl, 3-phenyl-; Diphenylbenzene; Gilotherm OM 2; NSC 6808; Benzene, m-diphenyl-

Frequently Asked Questions

What are the CAS number and molecular formula of Terphenyl?

CAS 26140-60-3; molecular formula C18H14; molecular weight — g/mol.

What other names is Terphenyl known by?

M-TERPHENYL, 1,3-Diphenylbenzene, 1,1':3',1''-Terphenyl, 92-06-8, m-Diphenylbenzene, m-Triphenyl.

What is the regulatory status of Terphenyl?

Documented regulatory listings: FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS.

Is Terphenyl classified as hazardous?

6.2% of GHS notifications report no hazard classification (3 of 48).

What are the key physical properties of Terphenyl?

Boiling Point: 689 °F at 760 mmHg (NIOSH, 2024); Boiling Point: 363 °C AT 760 MM HG; Boiling Point: 630 °F; Boiling Point: 689 °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.