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Description and features

Rostabil TTDP (Tri iso tridecyl phosphite) is a clear liquid with has C39H81O3P as chemical formula. It is a trialkyl phosphite which is applied as secondary stabilizer in ABS, PET, PET fibers, lubricants, PVC, polycarbonate and polyurethanes.

Tri iso  tridecyl phosphite is also known as tris(11-methyldodecyl) phosphite.


Europe: Provided Rostabil TTDP is on stock in our local warehouses our lead time is about one week if delivered in 200 KG steel drums.

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

This substance (CAS: 77745-66-5) has been registered (FULL) under REACH (EC) 1907/2006.

Product Identification

CAS number 77745-66-5
EC number 278-758-9
HS code 2920 90 85
IUPAC nametris(2-methylnonacosyl) phosphite


AppearanceClear liquid
Acid value≤0.20 (mg KOH/g)
Colour ≤ 100 Hazen


Phostacon TTDP (Tri iso tridecyl phosphite) is mainly used in production of PVC.


Available packaging: 200 KG steel drums or 860 KG IBC.
Special packaging is available on request.


Store Tri Iso Tridecyl Phosphite in a cool, dry and well-ventilated area and in line with legal requirements.
Keep TTDP 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 C39H81O3P
Molecular weight 629.03 g/mol
Structural formula 77745-66-5

Physicochemical information

Boiling point 520.01 °C
Density 0.87 – 0,91 g/cm3 @ 20 ºC
Flash point 154 ºC
Melting point <-20 ºC
Partition coefficient (log Kow) 16.73 @ 25 ºC
Refractive index 1.459 – 1.465
Specific gravity 0.880 – 0900 g/m3 (25 ºC / 15 ºC)
Solubility in water Insoluble (< 0.1 mg/l)
Vapour pressure < 0.00000114 Pa @ 25 ºC
Tri Iso Tridecyl Phosphite | CAS: 77745-66-5 |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.