Tri(nonylphenyl) phosphite
CAS 26523-78-4
EC 247-759-6
Formula C45H69O3P
MW 689 g/mol
Organometallic Compounds Plastics & PolymersLubricants & MetalworkingRubber & Tire Antioxidant & StabilizerPlasticizer & Softener
Description
Tri(nonylphenyl) phosphite (CAS 26523-78-4) is an organophosphite antioxidant and stabilizer commercially available under trade names including IRGAFOS TNPP, Mark 829, Mark 1178, and JP 351. It carries no assigned E-code and is identified under EC number 247-759-6.
In polymer processing, it functions as a secondary antioxidant by decomposing hydroperoxides formed during thermal oxidation, reducing chain scission and discoloration in PVC, polyolefins, and rubber compounds. It is also used in lubricant formulations to inhibit oxidative degradation of base oils under high-temperature service conditions.
Tri(nonylphenyl) phosphite is supplied as a thick oil and is subject to REACH registration requirements within the European Economic Area. Procurement teams should verify supplier REACH compliance documentation and confirm suitability for end-use applications, as the substance is not approved for food-contact or pharmaceutical use under current EU frameworks.
In polymer processing, it functions as a secondary antioxidant by decomposing hydroperoxides formed during thermal oxidation, reducing chain scission and discoloration in PVC, polyolefins, and rubber compounds. It is also used in lubricant formulations to inhibit oxidative degradation of base oils under high-temperature service conditions.
Tri(nonylphenyl) phosphite is supplied as a thick oil and is subject to REACH registration requirements within the European Economic Area. Procurement teams should verify supplier REACH compliance documentation and confirm suitability for end-use applications, as the substance is not approved for food-contact or pharmaceutical use under current EU frameworks.
Physical Properties
| Boiling Point | >360 °C(lit.) |
| Density | 0.99 g/mL at 25 °C(lit.) |
| Flash Point | >230 °F |
| Color | Colourless |
| Odor | mild odor |
| Form | Thick Oil |
| Refractive Index | n 20/D 1.528(lit.) |
Safety & Handling (Learn More)
Danger GHS07 GHS09 GHS05 GHS08
H
H315H317H318H361H400H410
P
P203P261P264P272P273P280P317P318P321P391P405P501P264+P265P302+P352P332+P317P333+P317P362+P364P305+P354+P338
Trade & Regulatory
| UN Number | 3278 |
| Storage Class | 10 - Combustible liquids |
| WGK (Germany) | 2 |
Other Names
Tris(4-Nonylphenyl) PhosphiteTNPPtris(nonylphenyl)phosphiteJP 351Mark 829Mark 1178IRGAFOS TNPPNonylphenyl phosphite
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