TERPHENYLS (O-, M-, P- ISOMERS)†

Chemical Identification
Chemical Identification
CAS # 26140-60-3
Formula

C₆H₅C₆H₄C₆H₅

Synonyms

o(m or p)-diphenylbenzene; 1,2(3 or 4)-diphenylbenzene; 2(3 or 4)-phenylbiphenyl; 1,2(3 or 4)-Terphenyl; o(m or p)-terphenyl; o(m or p)-triphenyl

Physical Properties
Physical Properties
Physical description Colorless or light-yellow solid.
Boiling point 630°F Molecular weight 230.3
Freezing point/melting point Vapor pressure 0.01 mmHg at 200°F for M-, 0.09 mmHg at 200°F for O-, very low for P-
Flash point 325-405°F (open cup) Vapor density
Specific gravity 1.1-1.23 Ionization potential 7.78-8.01 eV
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating 1 NFPA fire rating 1
NFPA reactivity rating 0 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.)
Sampling group
Sampler/Sampling media
Sampling time*
Sampling volume (TWA)*
Sampling flow rate (TWA)*
Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments
Method reference
Notes
Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA REL-TWA TLV-TWA PEL-TWA
PEL-STEL REL-STEL TLV-STEL PEL-STEL
PEL-C

1 ppm (9 mg/m³)

REL-C

0.5 ppm (5 mg/m³)

TLV-C

5 mg/m³ [1977]

PEL-C

0.5 ppm (5 mg/m³)

Skin notation

N

Skin notation

N

Skin notation

N

Skin notation

N

Notes:

See 29 CFR 1910.1000 Table Z-1.

Notes: Notes: Notes:
Health factors:  See NIH-NLM PubChem. IDLH

500 mg/m³

Carcinogenic classifications: Not listed Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - O-Terphenyl

NIOSH: Pocket Guide to Chemical Hazards - o-Terphenyl

Literature References

  • NOAA: CAMEO Chemicals - M-Terphenyl, P-Terphenyl
  • NIOSH: Pocket Guide to Chemical Hazards - m-Terphenyl, p-Terphenyl.
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Terphenyls (o-, m-, p-isomers). See annual publication for most recent information.

Last Updated Date : 01/28/2021