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Description and features

Rostabil TPP (Triphenyl phosphite) is a clear liquid with has C18H15O3 as chemical formula. It is an organo-phosphite which provides excellent colour improvement and heat stability. It is used in ABS, polyethylene, polypropylene, polystyrene, polyester resins, epoxy resins and synthetic rubber.

TPP is also known as Triphenyl phosphoric acid ester and Triphenoxyphosphine oxide.


Europe: Rostabil TPP ( Trisnonylphenol phosphite) is ➔ on stock in our local warehouses our lead time is about one week if delivered in 225 KG 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: 101-02-0) has been registered (FULL) under REACH (EC) 1907/2006.

Product Identification

CAS number 101-02-0
EC number 202-908-4
HS code 2920 29 00
IUPAC NameTriphenyl phosphite


Appearance Clear homogeneous liquid
Assay≥97.0 %
Acid value ≤0.50 (mg KOH/g)
Colour ≤50 Hazen
Phenol≤1.00 %
Phosphorus 9.80 – 10.00 %


Available packaging: 225 KG steel drums and 1.000 KG IBC.
Special packaging is available on request.


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


A Material Safety Data Sheets (MSDS) is available for Rostabil TPP 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 C18H15O3P
Molecular weight 310.28 g/mol
Smiles notation c1ccc(cc1)OP(Oc2ccccc2)Oc3ccccc3
Structural formula 101-02-0

Physicochemical information

Boiling point 386 °C @ 101.63 kPa
Flash point 218.30 ºC
Melting point 144 ºC
Partition coefficient (log Pow) 6.62 @ 25 ºC
Relative density 1.18 – 1,186 g/l @ 25 ºC
Refractive index 1.587 – 1.590 @ 25 ºC
Specific gravity 1.170 – 1.195 g/m3 (25 ºC / 15 ºC)
Solubility in water Insoluble (< 0.1 mg/l)
Vapour pressure 0.0000763 mm Hg @ 25 ºC

Triphenyl phosphite | CAS: 101-02-0 | 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.