Description

Dioctadecyl [[3,5-Bis(1,1-Dimethylethyl)-4-Hydroxyphenyl]Methyl]Phosphonate is a high-performance, sterically hindered phenolic phosphite antioxidant. This compound is engineered to provide exceptional long-term thermal stability and color protection to polymers by effectively scavenging free radicals and decomposing hydroperoxides. It is a critical additive for manufacturers requiring enhanced processing stability and extended service life for their polymeric materials. Key industries that rely on this antioxidant include plastics, synthetic fibers, and elastomer production.

Application

• Polymer Stabilization: Primary application as a processing and long-term heat stabilizer for polyolefins (PP, HDPE, LDPE), polyamides, and engineering plastics.
• Color Protection: Prevents yellowing and discoloration in polymers during high-temperature processing and end-use, crucial for clear and white applications.
• Synergistic Formulations: Used in combination with primary antioxidants (e.g., hindered phenols) and other phosphites to create highly effective stabilization systems.
• Fiber and Film Production: Protects synthetic fibers and thin films from thermal degradation during melt spinning and extrusion processes.
• Elastomer and Rubber Industry: Enhances the aging resistance of synthetic rubbers and thermoplastic elastomers (TPEs).
• Adhesives and Sealants: Improves the thermal-oxidative stability of hot-melt adhesives and polymer-based sealants.

Basic Information

Product Name	Dioctadecyl [[3,5-Bis(1,1-Dimethylethyl)-4-Hydroxyphenyl]Methyl]Phosphonate
CAS No.	3135-18-0
Molecular Formula	C53H93O4P
Molecular Weight	825.27 g/mol
Synonyms	Bis(octadecyl) 3,5-di-tert-butyl-4-hydroxybenzylphosphonate; Distearyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate; Irgafos 168 (related commercial grade); Phosphonic acid, [[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]-, dioctadecyl ester; Antioxidant 168; Hostanox PAR 24; Doverphos S-686; Weston 618; AO-168
EINECS	221-519-7

Quality Control

Our production of Dioctadecyl [[3,5-Bis(1,1-Dimethylethyl)-4-Hydroxyphenyl]Methyl]Phosphonate adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for assay and impurity profiling, to ensure high purity and consistent performance. We provide full traceability and Certificates of Analysis (COA) with each shipment. Our quality systems are designed to meet the rigorous demands of global polymer additive supply chains.

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 easily oxidized; for long-term storage, consider an inert atmosphere (e.g., nitrogen blanket). Keep away from strong oxidizing agents and heat sources.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or flakes
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0 %
Melting Point	48 - 52 °C
Volatile Matter	≤ 0.5 %
Acidity (as H3PO4)	≤ 0.05 %
Solution Color (APHA)	≤ 50

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