Description

N,n-Bis(3,5-Di-tert-Butyl-2-Hydroxyphenyl)-1,3-Phenylenediamine CAS NO 2951-81-7 is a high-performance phenolic antioxidant and amine-based light stabilizer. This compound is critical for protecting polymers and synthetic materials from oxidative degradation and UV-induced damage, thereby extending their service life and maintaining performance integrity. It is essential for manufacturers in the plastics, rubber, and coatings industries who require reliable stabilization for high-value products exposed to demanding environmental conditions.

Application

• Primary antioxidant and light stabilizer for polyolefins (PP, HDPE, LDPE).
• Stabilizing agent for engineering plastics and synthetic rubbers against thermal-oxidative degradation.
• Additive in adhesives, sealants, and coatings to prevent embrittlement and color fading.
• Used in the stabilization of lubricants and greases to enhance their operational lifespan.
• Protective component in wire and cable insulation compounds.
• Stabilizer for elastomers in automotive components like hoses and belts.

Basic Information

Product Name	N,n-Bis(3,5-Di-tert-Butyl-2-Hydroxyphenyl)-1,3-Phenylenediamine
CAS No.	2951-81-7
Molecular Formula	C34H48N2O2
Molecular Weight	516.76 g/mol
Synonyms	1,3-Phenylenediamine, N,N-bis(3,5-bis(1,1-dimethylethyl)-2-hydroxyphenyl)-; Antioxidant 445; Irganox 445; Bis(3,5-di-tert-butyl-2-hydroxyphenyl)-1,3-phenylenediamine; 3,5-Di-tert-butyl-4-hydroxybenzenepropanoic acid, reaction products with 1,3-phenylenediamine; Phenol, 3,5-bis(1,1-dimethylethyl)-, reaction products with m-phenylenediamine; UV-445
EINECS	220-971-6

Quality Control

Our production of N,n-Bis(3,5-Di-tert-Butyl-2-Hydroxyphenyl)-1,3-Phenylenediamine adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing to ensure consistent purity, performance, and compliance with relevant industry specifications. A detailed Certificate of Analysis (COA) is provided with each shipment, documenting key parameters such as assay, melting point, and impurity profiles.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from heat sources and incompatible materials. Due to its light-sensitive nature, containers should be kept in opaque packaging or dark storage conditions.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0 %
Melting Point	185 - 195 °C
Loss on Drying	≤ 0.5 %
Heavy Metals (as Pb)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.