Trisnonylphenyl phosphite (TNPP)

Basic Info:

  • Chemical Synonym(s): IRGAFOS TNPP; Tris(mono-nonylphenyl)phosphite,2,2'-methylene bis (4-methyl-6-nonyl phenol); nonyl-pheno phosphite; Phenol,nonyl-,phosphite; Naugard RM-51; Naugard PHR; Alkanox TNPP;
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  • CAS Number: 26523-78-4
  • Chemical Formula:


  • MSDS: Download


0.99 g/mL at 25 °C(lit.)
Boiling Point
>360 °C(lit.)
Flash Point
>230 °F
Refractive Index
n20/D 1.528(lit.)
Specific Gravity
Moisture Sensitive
EPA Substance Registry System
Phenol, nonyl-, phosphite (3:1) (26523-78-4)
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We help you source Trisnonylphenyl phosphite (TNPP) in China

Our Advantages:

Our company established a special pesticide chemicals division in October 2011 to engage in the export business of pesticide chemicals, and it has been 10 years since then.
We have made remarkable achievements in pesticides, fungicides and herbicides, and have achieved long-term cooperation with customers in Australia, New Zealand, Africa, Asia and South America.
Our advantageous products o-chlorophenol and o-chlorobenzaldehyde have been sold to many countries.

We have a 20+ year track record of working with suppliers in China and rating reports on them, and we keep our suppliers updated with the latest news so our customers can get the latest supplier reports. We know the market well and have early warning notifications on upstream raw material prices to help you build a stable supply chain.

When selecting suppliers, our procurement specialists will audit the qualification of suppliers, conduct thorough investigations such as field visits and sample testing, and make ratings to ensure the authenticity and legality of supplier information.

We have a long-term stable cooperation with GLP laboratories, encounter customer test results and supplier test results do not match the situation, we will commission a third party to test to ensure the accuracy, authenticity and reliability of the experimental results. In this way, we can effectively control the product quality problems.

We have a long-term cooperative warehouse and can follow up packaging and labeling according to safety regulations and customer requirements. In order to effectively prevent damage to the goods in transit, we have prepared various reinforcement measures and packaging solutions.

We have a number of international freight companies with whom we have long-standing cooperation, and we can choose several route options according to the customer's requirements. For more difficult or urgent orders, we will prepare several alternative solutions to ensure safe and timely delivery.


We promise to immediately and unconditionally exchange or return the goods if they have quality problems. Our employees who deal with after-sales issues have many years of international work experience and are familiar with various processes in multinational work, so they can communicate and deal with after-sales issues without any obstacles.

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Trisnonylphenyl phosphite (TNPP) is a colourless to yellow, viscous liquid with a sweet odour. It is commonly used in fungicides and organic synthesis.

It boasts many excellent properties:It is remarkably inert and won't break down under customary conditions.It degrades via oxidative reactions with air, ozone or hydroperoxides.

It has low volatility and little tendency for self-ignition at room temperature.The flashpoint is 66°C, making this an ideal oil if you want to add some final gloss before storing equipment such as vats or drums of TNPP at low temperature.

It is a water-based pesticide with the trifunctional purpose of reducing mites, fungi, and moss. It is often used in plastics to improve their resilience to heat, electrical currents, and impact. 


Trisnonylphenyl phosphite (TNPP) is commonly used to stabilize organic solvent-based pesticides, formulations, emulsions, and coatings. It is also suitable for water-phase photopolymerization because it has outstanding hydrolytic stability to hexavalent chromium ions. 

It is used as a biocide for water treatment or applied to seeds to kill microbial contamination. It is a phosphorus-containing chemical found in some pesticides, paints and varnishes, octopus potting soil, and some wood chip surfaces. 

It is used in various industrial and commercial commodities such as adhesives, lubricants, plywood coatings, printers' ink, paint removers and anti-graffiti protector.

It is also utilized extensively in the Synthetic Resin Manufacturing Industry for catalysts.

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