- ▸ Flame retardant plasticizer for flexible PVC, coatings, and vinyl compounds
- ▸ Low-volatility, fire-resistant flexibilizer with good low-temperature performance
- ▸ Mixed alkyl-aryl phosphate for fire-rated flexible polymer goods
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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Isodecyl diphenyl phosphate (IDDP) is an alkyl-aryl phosphate flame-retardant plasticizer with a long isodecyl chain, giving very good low-temperature flexibility and low volatility in flexible PVC. Identity: CAS 29761-21-5.
What it is
Isodecyl diphenyl phosphate (CAS 29761-21-5) is a mixed isodecyl/diphenyl phosphate liquid. The long alkyl chain makes it more of a plasticizer-leaning FR with excellent cold flexibility.
How it performs in fire
It promotes char in the condensed phase while plasticizing; the isodecyl chain delivers strong low-temperature performance and good permanence, useful in flexible vinyl for demanding service conditions.
Applications
IDDP is used as a flame-retardant plasticizer in flexible PVC, vinyl, films and wire/cable compounds needing cold flexibility. Compare DPO and CDP.
Forms, grades and handling
IDDP 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 Isodecyl 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 | 29761-21-5 |
| Molecular Formula | C22H31O4P |
| Molecular Weight | 390.5 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 249-828-6
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is isodecyl diphenyl phosphate (IDDP) used for?
Isodecyl diphenyl phosphate (CAS 29761-21-5) is an alkyl-aryl phosphate flame-retardant plasticizer for flexible PVC, vinyl, films and wire/cable compounds, valued for low-temperature flexibility and low volatility.
How is bulk isodecyl diphenyl phosphate supplied and quoted?
RawSource supplies isodecyl 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 Isodecyl Diphenyl Phosphate (DPDP)?
Isodecyl Diphenyl Phosphate (DPDP) (CAS 29761-21-5) 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 249-828-6).