Description

Nonyl Diphenyl Phosphite is a versatile organophosphorus compound widely used as a high-performance antioxidant and stabilizer in polymer systems. Its primary value lies in its ability to effectively inhibit thermal and oxidative degradation, thereby extending the service life and maintaining the physical properties of sensitive materials. This makes it an essential additive for manufacturers in the plastics, synthetic rubber, and lubricant industries seeking to enhance product durability and performance under demanding conditions.

Application

• Primary antioxidant and process stabilizer for polyolefins (PP, PE) and engineering plastics.
• Synergistic co-stabilizer in PVC formulations to improve long-term heat stability.
• Stabilizer for synthetic rubbers and elastomers to prevent chain scission and cross-linking.
• Additive in lubricant and grease formulations to reduce oxidation and sludge formation.
• Intermediate in the synthesis of other specialty phosphite antioxidants and phosphorous-containing compounds.
• Stabilizer for adhesives and sealants to prevent viscosity increase and gelation.

Basic Information

Product Name	Nonyl Diphenyl Phosphite
CAS No.	63981-08-8
Molecular Formula	C27H33O3P
Molecular Weight	436.52 g/mol
Synonyms	Phosphorous Acid, Nonyl Diphenyl Ester; Diphenyl Nonyl Phosphite; Nonylphenyldiphenyl Phosphite; NDOP; Antioxidant 618; Weston 618; Doverphos 618; Phosphite Stabilizer 618; Tris(nonylphenyl) Phosphite (related compound); Phenyl Nonyl Phosphite
EINECS	Contact for details

Quality Control

Our Nonyl Diphenyl Phosphite is manufactured under a strict quality management system to ensure batch-to-batch consistency and high purity. The product undergoes rigorous analytical testing, including assay, color, and acidity determination, to meet typical industrial specifications. A Certificate of Analysis (COA) documenting key parameters is provided with each shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and should be kept under a dry inert atmosphere (e.g., nitrogen) after opening to prevent hydrolysis and oxidation.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0 %
Color (APHA)	≤ 50
Acidity (as H3PO4)	≤ 0.1 %
Moisture (KF)	≤ 0.1 %
Refractive Index (n20D)	1.525 - 1.535
Density (20°C)	1.00 - 1.05 g/cm³

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