Description

Diisooctyl 4-Octylphenyl Phosphite is a specialized organophosphite compound widely utilized as a high-performance secondary antioxidant and process stabilizer. Its primary value lies in its ability to effectively decompose hydroperoxides, thereby preventing oxidative degradation and maintaining the integrity of polymers during high-temperature processing and long-term use. This product is essential for manufacturers in the plastics, rubber, and synthetic lubricant industries seeking to enhance product longevity and thermal stability.

Application

• As a secondary antioxidant (hydroperoxide decomposer) in polyolefins such as polypropylene (PP) and polyethylene (PE).
• As a process stabilizer to prevent polymer chain scission and discoloration during extrusion and molding operations.
• In the formulation of synthetic lubricants and greases to improve oxidative stability and extend service life.
• As a stabilizer component in adhesive and sealant formulations to prevent gelation and maintain viscosity.
• In elastomer and rubber compounds to protect against heat aging and maintain mechanical properties.
• As an additive in PVC and other halogenated polymers, often in synergy with primary stabilizers.

Basic Information

Product Name	Diisooctyl 4-Octylphenyl Phosphite
CAS No.	68133-13-1
Molecular Formula	C30H55O3P
Molecular Weight	494.73 g/mol
Synonyms	Bis(2-ethylhexyl) 4-octylphenyl phosphite; Di(2-ethylhexyl) 4-octylphenyl phosphite; 4-Octylphenyl diisooctyl phosphite; Phosphorous acid, bis(2-ethylhexyl) 4-octylphenyl ester; Octylphenyl di(2-ethylhexyl) phosphite; Antioxidant 619; Weston 619; Doverphos 253
EINECS	Contact for details

Quality Control

Our Diisooctyl 4-Octylphenyl Phosphite is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for identity, purity, and performance. Certificates of Analysis (COA) documenting key parameters such as assay, color, acidity, and refractive index are provided to guarantee consistent quality and batch-to-batch reliability for your formulations.

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 easily oxidized; it is recommended to store under an inert atmosphere (e.g., nitrogen) after opening to maintain product integrity. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0 %
Acidity (as H3PO4)	≤ 0.1 %
Color (APHA)	≤ 50
Refractive Index (nD20)	1.4750 - 1.4850
Density (20°C)	0.940 - 0.960 g/mL
Moisture (KF)	≤ 0.1 %

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