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Description and features

Rostabil TDP (Triisodecyl phosphite) is a clear liquid which has C30H63O3P as chemical formula. It is a trialkyl phosphite which is useful as a secondary stabilizer in ABS, PET (polyethylene terephthalate), PET fibers, coatings, lubricants, PVC, polycarbonate and polyurethanes.

This material is also known as Phosphorus acid triisodecyl ester and isodecylphosphite.


Europe and United States: Provided Rostabil TDP is on stock in our local warehouses our lead time is about one week if delivered in 180 KG steel drums.

Canada, South America, South Africa and other markets can also be served, please contact our sales department for more details.

This substance (CAS: 25448-25-3) has been registered (FULL) under REACH (EC) 1907/2006.

Product Identification

CAS number 25448-25-3
EC number 246-998-3
HS code 2920 90 85
IUPAC nametris(2-methylnonyl) phosphite


Appearance Homogenous clear liquid @ 20 -25 ºC
Acid Value ≤0.10 (mg KOH/g)
Colour≤50 Hazen


Available packaging: 180KG steel drums.
Special packaging is available on request.


Store Triisodecyl phosphite in a cool, dry and well-ventilated area and in line with legal requirements.
Keep TDP away from heat sources and oxidizing agents.


A Material Safety Data Sheets (MSDS) is available for Rostabil TTDP and all other products supplied by Vesta Chemicals BV.

An MSDS describes the hazards of a product and explains how a product can be safely handled, used and stored. Besides it provides important regulatory and emergency response information for the purchased product.

Molecular and structural information

Molecular formula C30H63O3P
Molecular weight 502.79 g/mol
Structural formula 25448-25-3

Physicochemical information

Boiling point 485.52 °C
Density0.88-0.905 g/cm3 @ 20 ºC
Flash point 150 °C @ 1 atm
Melting point < -20 °C @ 1 atm
Partition coefficient (log Pow) 12.31 @ 25 °C
Refractive index 1.4500 – 1.4610
Solubility in water Insoluble (< 0.1 mg/l)
Specific gravity 0.874 – 0.914 g/m3 (25 ºC/15 ºC)
Vapour pressure 1E-09 to 5E-07 Pa
Triisodecyl phosphite | CAS: 25448-25-3 | Disclaimer. This information is supplied solely for informational purposes and Vesta Chemicals bv makes no guarantees or warranties, either expressed or implied, with respect to the accuracy and use of this data. All product warranties and guarantees shall be governed by the Standard Terms of Sale. Nothing in this document is legal advice or is a substitute for competent legal advice.