Antioxidants
REACH
Nonylphenyl phosphite
CAS Number
26523-78-4
EC Number
247-759-6
Abbreviation
TNPP
What is Nonylphenyl phosphite?
Nonylphenyl phosphite (CAS 26523-78-4), commercially known as TNPP, is a phosphite ester antioxidant and stabilizer.
Where is Nonylphenyl phosphite used?
- Plastics processing: protects polyolefins, PVC, and styrenic polymers against color development and molecular weight loss during high-temperature extrusion or molding
- Rubber compounding: inhibits oxidative breakdown in tire and industrial rubber goods, extending service life
- Lubricants and metalworking fluids: antioxidant and mild extreme-pressure additive that maintains fluid stability under thermal stress and mechanical pressure
- Flexible PVC: plasticizer that contributes to processing efficiency
- It decomposes hydroperoxides formed during thermal processing to prevent degradation of the base material.
Good to know: Buyers should confirm phosphorus content, acid value, and color specifications when evaluating lots for sensitive polymer uses.
Commercial specifications
- Confirm phosphorus content, acid value, and color specifications
Other Names (Synonyms)
Tris(4-nonylphenyl) phosphite|Tris(nonylphenyl)phosphite|Tris(nonylphenyl) phosphite|TNPP
What are the physical properties of Nonylphenyl phosphite?
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.)
How is Nonylphenyl phosphite classified and handled safely? Learn More
Warning
GHS07· Irritant GHS09· Environmental Hazard GHS05· Corrosive GHS08· Health Hazard
Hazard Statements
H315 Causes skin irritation
H317 May cause an allergic skin reaction
H318 Causes serious eye damage
H361 Suspected of damaging fertility or the unborn child
H400 Very toxic to aquatic life
H410 Very toxic to aquatic life with long lasting effects
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P272 Contaminated work clothing should not be allowed out of the workplace.
Which trade and regulatory codes apply to Nonylphenyl phosphite?
UN Number 3278
Storage Class 10 - Combustible liquids
WGK (Germany) 2