Description

Bis(2-Ethylhexyl) Phosphite is a versatile organophosphorus compound widely used as a high-performance stabilizer and intermediate. Its primary value lies in its ability to act as a highly effective antioxidant and chelating agent, preventing degradation in various polymer and chemical systems. This product is essential for manufacturers in the plastics, lubricant, and specialty chemical industries seeking to enhance product longevity and performance under demanding conditions.

Application

• Polymer Stabilizer: Acts as a secondary antioxidant and metal deactivator in polyolefins (e.g., PP, PE), PVC, and engineering plastics to prevent thermal and oxidative degradation during processing and end-use.
• Lubricant & Grease Additive: Functions as an anti-wear and extreme pressure (EP) additive, as well as an antioxidant, in synthetic lubricants, hydraulic fluids, and metalworking fluids.
• Chemical Intermediate: Serves as a key building block in the synthesis of other organophosphorus compounds, including more complex phosphite and phosphate esters.
• Adhesive & Sealant Formulation: Used as a stabilizer to prevent gelation and maintain viscosity in polyurethane and other adhesive systems.
• Rubber Industry: Employed as a non-discoloring antioxidant in synthetic rubber production to protect against heat and oxygen exposure.
• Fuel & Oil Additive: Contributes to the stabilization of fuels and oils by sequestering metal ions that catalyze oxidation reactions.

Basic Information

Product Name	Bis(2-Ethylhexyl) Phosphite
CAS No.	3658-48-8
Molecular Formula	C16H35O3P
Molecular Weight	306.42 g/mol
Synonyms	Di(2-ethylhexyl) phosphite; Bis(2-ethylhexyl) hydrogen phosphite; Phosphorous acid, bis(2-ethylhexyl) ester; Dioctyl phosphite; DIOP; 2-Ethylhexyl phosphite (diester); Hostanox PAR 24; Doverphos 275; Weston ODPP; Antioxidant 1222
EINECS	222-908-8

Quality Control

Our Bis(2-Ethylhexyl) Phosphite is manufactured under strict quality management systems. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color, acidity, and other critical parameters. A Certificate of Analysis (COA) is provided with each shipment, detailing the results against our stringent internal standards. We are committed to consistent quality and supply reliability for our global B2B partners.

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); keep containers tightly sealed when not in use to minimize contact with atmospheric moisture. Keep away from strong oxidizers and bases.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 95.0%
Acidity (as H3PO4)	≤ 0.5 %
Color (APHA)	≤ 50
Moisture (KF)	≤ 0.1 %
Refractive Index (n20D)	1.440 - 1.450
Density (20°C)	0.920 - 0.940 g/mL

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