Description

9,10-Dihydro-9-Oxa-10-Phosphaphenanthrene 10-Oxide (CAS NO 35948-25-5) is a high-performance organophosphorus compound widely recognized as a highly effective reactive flame retardant. Its primary value lies in its ability to be chemically incorporated into polymer backbones, providing durable, non-migrating flame retardancy without compromising the mechanical properties of the final material. This product is essential for manufacturers in the electronics, construction, and advanced composite materials industries seeking to meet stringent fire safety regulations while maintaining product integrity.

Application

• As a key reactive intermediate in the synthesis of flame-retardant epoxy resins for printed circuit boards and semiconductor encapsulation.
• Incorporation into unsaturated polyester resins and vinyl ester resins for producing flame-retardant fiberglass composites used in transportation and construction.
• Modification of polycarbonate, polyurethane, and other engineering thermoplastics to enhance their fire resistance for electronic housings and automotive components.
• Used in the production of transparent, flame-retardant coatings and adhesives where color and clarity are critical.
• Serving as a starting material for advanced phosphorus-containing curing agents and hardeners for high-performance polymer systems.
• Research and development of novel polymeric materials with intrinsic flame retardancy for aerospace and military applications.

Basic Information

Product Name	9,10-Dihydro-9-Oxa-10-Phosphaphenanthrene 10-Oxide
CAS No.	35948-25-5
Molecular Formula	C12H9O2P
Molecular Weight	216.17 g/mol
Synonyms	DOPO; 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; 6H-Dibenz[c,e][1,2]oxaphosphorin 6-oxide; 2,3-Epoxypropyl phenyl phosphate (related derivative); HCA (Hexachloroacetone) adduct precursor; Reactive DOPO-based flame retardant; Phenanthrenequinone phosphate oxide; DOPO monomer.
EINECS	Contact for details

Quality Control

Our production of 9,10-Dihydro-9-Oxa-10-Phosphaphenanthrene 10-Oxide adheres to a strict quality management system to ensure batch-to-batch consistency and high purity. The product undergoes rigorous analytical testing, including HPLC for assay and purity, and is supplied with a comprehensive Certificate of Analysis (COA) detailing key parameters such as melting point, phosphorus content, and moisture levels. We are committed to meeting the specific requirements of our global customers in advanced polymer applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and reactivity.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.5%
Melting Point	118 - 122 °C
Phosphorus Content	Contact for details
Moisture (KF)	≤ 0.5%

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