o-Terphenyl

  • o-Diphenylbenzene
  • 1,2-Diphenylbenzene
  • 2-Phenylbiphenyl
  • 1,2-Terphenyl
  • o-Triphenyl
  • 1,1':2',1''-Terphenyl
Formula
2-(C6H5)C6H4C6H5
Structure
Description
Monoclinic prisms from methanol.
Uses
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.

Registry Numbers and Inventories.
CAS
84-15-1
EC (EINECS/ELINCS)
201-517-6
EC Class
harmful
R 22 36/37/38
S 26 36/37/39
RTECS
WZ6472000
RTECS class
Other
UN (DOT)
1325
Beilstein/Gmelin
1908446
Beilstein Reference
4-05-00-02478
Swiss Giftliste 1
G-3808
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C18H14
Formula mass
230.31
Melting point, °C
54 - 56
Boiling point, °C
338
Vapor pressure, mmHg
0.0003
Vapor density (air=1)
7.95
Critical temperature
613
Critical pressure
38.5
Density
1.1 g/cm3 (20 C)
Solubility in water
Insoluble
Viscosity
0.357 cp (28 C)
Surface tension
17.3 g/s2 (28 C)
Refractive index
1.6421 (20 C)
Heat of fusion
16.9 kJ/mol
Heat of vaporization
58.3 kj/mol

Hazards and Protection.
Storage
Keep tightly closed. Store in a cool and dry place.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode. Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained breathing apparatus operated in pressure-demand or other positive-pressure mode.
Small spills/leaks
Make no contact with the spilled material. ELIMINATE all ignition sources and ground all equipment. With clean shovel place material into clean, dry container and cover loosely; move containers from spill area.
Disposal code
3
Stability
Stable.
Incompatibilities
Incompatible with oxidizing agents.
Decomposition
Oxides of carbon.

Fire.
Flash Point,°C
163
Upper exp. limit, %
3.4
Lower exp. limit, %
0.5
Fire fighting
Carbon dioxide, dry chemical.
Fire potential
Slight fire risk when exposed to heat or flame.
Hazards
Fire may produce irritating or poisonous gases.
Combustion products
Fire may produce irritating and/or toxic gases.
Health
0
 
Flammability
1
 
 
Reactivity
0
 

Health.
Exposure limit(s)
NIOSH REL: C 5 mg/m3 (0.5 ppm) OSHA PEL: C 9 mg/m3 (1 ppm) IDLH 500 mg/m3
Poison_Class
4
Exposure effects
Headache, fatigue, numbness, and aching limbs have occurred in workers. Peripheral and central nerve damage may occur.
   Ingestion
Nausea, diffuse pain, and indigestion have been reported in workers with prolonged exposure to biphenyl.
   Inhalation
Respiratory tract irritation and bronchitis have been reported.
   Skin
Percutaneous absorption through intact skin has been noted.
   Eyes
Eye and mucous membrane irritation may occur.

First aid
 
   Ingestion
Dilution: following ingestion and/or prior to gastric evacuation, immediately dilute with 4 to 8 ounces (120 to 240 ml) of milk or water (not to exceed 15 ml/kg in a child). Consider after ingestion of a potentially life-threatening amount of poison if it can be performed soon after ingestion (generally within 1 hour). Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
1325
Response guide
Hazard class
4.1
Packing Group
II; III
 
32. Aromatic hydrocarbons
HS Code
2902 90 30