- ▸ Flame retardant plasticizer for flexible PVC, cellulose esters, and vinyl
- ▸ Low-temperature, fire-resistant plasticization for coatings and films
- ▸ Cost-effective aryl phosphate flexibilizer for fire-rated compounds
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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Cresyl diphenyl phosphate (CDP) is an alkyl-aryl phosphate flame-retardant plasticizer that balances good flame retardance with low-temperature flexibility in flexible PVC, at a lower viscosity than the triaryl phosphates. Identity: CAS 26444-49-5.
What it is
Cresyl diphenyl phosphate (CAS 26444-49-5) is a mixed cresyl/phenyl phosphate liquid. The single cresyl group plus two phenyls gives a lower-viscosity, lower-cost FR plasticizer than fully substituted triaryls.
How it performs in fire
It promotes char in the condensed phase while plasticizing, and its relatively low viscosity and good low-temperature performance make it useful where flexibility at cold temperatures matters alongside fire performance.
Applications
CDP is used as a flame-retardant plasticizer in flexible PVC, vinyl and coatings where low-temperature flexibility is wanted. Compare DPO and IDDP (alkyl-aryl) and TCP (triaryl).
Forms, grades and handling
CDP is supplied as a clear-to-pale 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 Cresyl Diphenyl Phosphate 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 | Flame-retardant plasticizer (alkyl-aryl phosphate) |
| Flame-retardant type | Alkyl-aryl phosphate |
| Role in fire performance | Condensed-phase char; plasticizer |
| CAS Number | 26444-49-5 |
| Molecular Formula | C19H17O4P |
| Molecular Weight | 340.3 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU): Not determined from public registry
- EC number: 247-693-8
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is cresyl diphenyl phosphate (CDP) used for?
Cresyl diphenyl phosphate (CAS 26444-49-5) is an alkyl-aryl phosphate used as a flame-retardant plasticizer in flexible PVC, vinyl and coatings, balancing flame retardance with low-temperature flexibility at lower viscosity than triaryl phosphates.
How is bulk cresyl diphenyl phosphate supplied and quoted?
RawSource supplies cresyl diphenyl 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 Cresyl Diphenyl Phosphate (CDP)?
Cresyl Diphenyl Phosphate (CDP) (CAS 26444-49-5) is listed as Active on the U.S. EPA TSCA Inventory; its REACH registration status is not determined from the public ECHA registry.