Terphenyls are a group of closely related aromatic hydrocarbons. Also known as diphenylbenzenes or triphenyls, they consist of a central benzene ring substituted with two phenyl groups. The three isomers are ortho-terphenyl, meta-terphenyl, and para-terphenyl. Commercial grade terphenyl is generally a mixture of the three isomers. This mixture is used in the production of polychlorinated terphenyls, which were formerly used as heat storage and transfer agents.
p-Terphenyl is the most common isomer. It is used as a laser dye and a sunscreen ingredient.
ortho-Terphenyl meta-Terphenyl para-Terphenyl

Chemical Name	1,4-diphenylbenzene
Synonyms	4-tert-butyl-thiophenol;4-(2-methyl-2-propylsulfanyl)phenol;p-tert-butylthiophenol;para-t-butyl-thiophenol;tert-butyl 4-hydroxyphenyl sulfide;Phenol,4-[(1,1-dimethylethyl)thio];para-terphenyl;[1,1',4',1'']terphenyl;1,1‘:4‘,1‘‘-Terphenyl;1,1',4',1''-tertphenyl;p-Terphenyl;Collapse
CAS No.	92-94-4
Molecular Formula	C18H14
Molecular Weight	230.30400
PSA	0.00000
LogP	5.02060

Appearance & Physical State	White solid
Density	1.23
Boiling Point	383ºC
Melting Point	209-216ºC
Flash Point	207ºC
Water Solubility	practically insoluble
Stability	Stable. Combustible. Incompatible with strong oxidizing agents.
Storage Condition	Store in a cool, dry place. Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
Vapor Density	7.95 (vs air)

RTECS	WZ6475000
Hazard Class	4.1
Safety Statements	S26
HS Code	2902909090
WGK Germany	2
Packing Group	II; III
RIDADR	UN 3077 9/PG 3
Risk Statements	R36/37/38
Hazard Codes	Xi