o-Terphenyl
o-Terphenyl (CAS: 84-15-1), a terphenyl isomer with the molecular formula C6H5C6H4C6H5 and a molar mass of 230.30 g/mol, is a versatile organic compound. It is widely employed as a high-temperature heat transfer fluid and as a building block in organic synthesis. Its robust chemical structure allows for stability at elevated temperatures, making it suitable for specialized industrial applications.
- IUPAC
- 1,2-Diphenylbenzene
- Synonyms
- 1,2-Diphenylbenzene

Heat Transfer Fluid
o-Terphenyl serves as a component in high-temperature heat transfer fluids due to its thermal stability and relatively high boiling point of 337 °C. It is often used in industrial processes requiring precise temperature control at elevated levels.
Organic Synthesis Intermediate
As an organic building block, o-Terphenyl is utilised in the synthesis of more complex organic molecules and polymers. Its aromatic structure provides a foundation for various chemical transformations.
Research and Development
This compound is valuable in research laboratories for exploring new chemical reactions and developing novel materials. Its well-defined properties make it a reliable reagent for experimental studies.
| Molecular weight | 230.30 |
|---|---|
| Linear formula | C6H5C6H4C6H5 |
| Assay | 99% |
| Boiling point | 337 °C(lit.) |
| Melting point | 56-59 °C(lit.) |


Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
- H400Very toxic to aquatic life
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P273Avoid release to the environment
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Flash point | 113 °C / 235.4 °F |
| Transport (UN / ADR) | UN 3077 9 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-36/37/38-50/53 |
| Safety statements (S) | 26-60-61 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is o-Terphenyl used for?
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o-Terphenyl is primarily used as a high-temperature heat transfer fluid and as an intermediate in organic synthesis and research applications.
What is the CAS number and formula for o-Terphenyl?
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The CAS number for o-Terphenyl is 84-15-1, and its molecular formula is C6H5C6H4C6H5.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies o-Terphenyl with a minimum assay of 99%. This is typically a technical or research grade, and we do not represent it as meeting USP, BP, or EP pharmacopoeia standards.
How should o-Terphenyl be handled safely?
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o-Terphenyl is harmful if swallowed, causes skin irritation, causes serious eye irritation, may cause respiratory irritation, and is very toxic to aquatic life with long lasting effects. Handle with appropriate personal protective equipment, including a dust mask (type N95 US), eyeshields, and gloves. Ensure adequate ventilation and avoid release to the environment.
How is o-Terphenyl packed and shipped?
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o-Terphenyl is packed according to industry standards for chemical transport and is exported globally by Tech Serve Solutions. For specific shipping requirements, please contact us.
How can I request a sample or quote for o-Terphenyl?
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To request a sample or a quote for o-Terphenyl, please contact the Tech Serve Solutions sales team through our website or by phone.
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