- ▸ Low-temperature plasticizer for PVC, vinyl, and synthetic rubber compounds
- ▸ Phosphorus flame retardant imparting flexibility and burn resistance
- ▸ Flexibilizer in coated fabrics and films requiring cold-flex performance
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
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Tris(2-ethylhexyl) phosphate (TOF) is a trialkyl phosphate low-temperature plasticizer that also contributes phosphorus for flame performance. Its three branched alkyl chains give excellent cold flexibility and low volatility. Identity: CAS 78-42-2.
What it is
Tris(2-ethylhexyl) phosphate (CAS 78-42-2) is a high-molecular-weight trialkyl phosphate liquid. It behaves primarily as a low-temperature plasticizer with a phosphorus-based FR contribution.
How it performs in fire
It plasticizes efficiently with outstanding low-temperature flexibility, while its phosphorus content contributes to fire performance in the condensed phase. It is also used as an anti-foam and in fire-resistant hydraulic fluids.
Applications
TOF is used as a low-temperature flame-retardant plasticizer in flexible PVC and synthetic rubber, and in hydraulic fluids and anti-foam applications. Compare TBEP and TIBP.
Forms, grades and handling
TOF is supplied as a clear, low-viscosity liquid in drums, IBCs and bulk. Properties are typical reference values; the Certificate of Analysis (CoA) for the lot you buy governs. Handle per the current Safety Data Sheet (SDS), and confirm regulatory status and restrictions for your market and end use — flame-retardant regulation evolves. Each lot ships with CoA, TDS and SDS.
Bulk supply and RFQ
RawSource sources Tris direct from producers in bulk, with CoA, TDS and SDS per lot. Tell us your polymer or system, the fire test you must pass, your maximum loading, and whether the application must be halogen-free, and we will quote the right grade. See the full range and selection logic in the flame retardants guide.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical / class | Low-temperature plasticizer / FR phosphate (trialkyl phosphate) |
| Flame-retardant type | Trialkyl phosphate |
| Role in fire performance | Plasticizer; phosphorus contribution |
| CAS Number | 78-42-2 |
| Molecular Formula | C24H51O4P |
| Molecular Weight | 434.6 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 201-116-6
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is tris(2-ethylhexyl) phosphate (TOF) used for?
Tris(2-ethylhexyl) phosphate (CAS 78-42-2) is a trialkyl phosphate used as a low-temperature plasticizer with a flame-retardant phosphorus contribution, in flexible PVC and synthetic rubber, and as an anti-foam and hydraulic-fluid component.
How is bulk tris(2-ethylhexyl) phosphate supplied and quoted?
RawSource supplies tris(2-ethylhexyl) phosphate in bulk with CoA, TDS and SDS per lot. Pricing is quote-based on grade and volume; submit an RFQ with your target quantity, polymer/system and the fire test you must pass.
What is the REACH and TSCA regulatory status of Tris(2-Ethylhexyl) Phosphate?
Tris(2-Ethylhexyl) Phosphate (CAS 78-42-2) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 201-116-6).