Description

10-(3, 5-Di-T-Butyl-4-Hydroxybenzyl)-9, 10-Dihydro-9-Oxa-10-Phosphaphenanthrene-10-Oxide is a high-performance, multifunctional organophosphorus antioxidant and flame retardant synergist. Its molecular structure combines hindered phenol and phosphaphenanthrene groups, providing exceptional thermal stability and radical scavenging activity. This compound is essential for manufacturers seeking to enhance the long-term durability and fire safety of advanced polymer materials.

Application

• Primary antioxidant and processing stabilizer for engineering plastics and high-temperature polymers.
• Flame retardant synergist in halogen-free flame retardant (HFFR) systems for polyamides (PA), polyesters (PBT, PET), and polycarbonates (PC).
• Stabilizer for synthetic fibers and films to prevent thermal-oxidative degradation during extrusion and spinning.
• Critical additive in high-performance adhesives and coatings to improve weatherability and service life.
• Used in the production of wire and cable insulation compounds requiring superior long-term thermal aging (LTA) performance.
• Stabilizing component for thermoplastic elastomers (TPE) and polyurethane (PU) materials.

Basic Information

Product Name	10-(3, 5-Di-T-Butyl-4-Hydroxybenzyl)-9, 10-Dihydro-9-Oxa-10-Phosphaphenanthrene-10-Oxide
CAS No.	98516-99-5
Molecular Formula	C28H33O3P
Molecular Weight	448.53 g/mol
Synonyms	DOPO-BQ; 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derivative; 10-(2,5-Dihydroxyphenyl)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (related); Antioxidant 10; Phosphaphenanthrene oxide antioxidant; P-containing hindered phenol; FR Synergist DOPO-BQ; Low-volatility phosphorous antioxidant.
EINECS	Contact for details

Quality Control

Our production of 10-(3, 5-Di-T-Butyl-4-Hydroxybenzyl)-9, 10-Dihydro-9-Oxa-10-Phosphaphenanthrene-10-Oxide adheres to a strict quality management system, ensuring batch-to-batch consistency for demanding industrial applications. Quality is verified through advanced analytical techniques including HPLC, GC, and NMR spectroscopy. A comprehensive Certificate of Analysis (COA) detailing purity, melting point, and specific impurity profiles is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after initial opening to minimize exposure to atmospheric moisture. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.5%
Melting Point	210 - 215 °C
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 10 ppm
Residue on Ignition	≤ 0.1%

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