Description

3,9-Dichloro-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane 3,9-Dioxide is a high-purity, halogenated organophosphorus compound primarily utilized as a reactive flame retardant and a key intermediate in advanced polymer synthesis. Its unique spirocyclic structure provides excellent thermal stability and compatibility, making it a critical component for enhancing material safety and performance. This product is essential for manufacturers in the plastics, electronics, and specialty chemical industries seeking to develop high-performance, flame-retardant materials.

Application

• Reactive Flame Retardant: A key monomer for synthesizing inherently flame-retardant polyesters, polyurethanes, and epoxy resins.
• Polymer Additive Intermediate: Used to manufacture specialized phosphorous-based additives for plastics and coatings.
• Electronics Encapsulation: Imparts flame retardancy to potting compounds and encapsulants for electronic components.
• Thermoset Resins: Incorporated into epoxy and unsaturated polyester resin systems for circuit boards and composite materials.
• Textile Finishing: Serves as a precursor for durable flame-retardant treatments on technical textiles.
• Specialty Chemical Synthesis: A versatile building block for creating novel phosphonates and phosphate esters with specific functionalities.

Basic Information

Product Name	3,9-Dichloro-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane 3,9-Dioxide
CAS No.	714-87-4
Molecular Formula	C5H6Cl2O6P2
Molecular Weight	286.95 g/mol
Synonyms	Dichloroneopentyl Glycol Phosphate; Spirocyclic Pentaerythritol Bisphosphonate Dichloride; PEPA-Dichloride; 3,9-Dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide; 2,2-Bis(chloromethyl)-1,3-propanediol cyclic phosphate; Bis(chloromethyl) propanediol phosphate; Spirobi(chloromethyl phosphate); NSC 169102
EINECS	211-925-5

Quality Control

Our production of 3,9-Dichloro-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane 3,9-Dioxide adheres to stringent quality management protocols to ensure batch-to-batch consistency and reliability. Each lot undergoes comprehensive analytical testing, including assay, purity profiling, and identification, to meet exacting customer specifications. A detailed Certificate of Analysis (COA) documenting all test results is provided with every shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at ambient temperature (15-25°C). Keep away from heat, open flames, and incompatible materials such as strong bases and oxidizing agents. The container must be kept tightly sealed to prevent moisture absorption.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	205 - 210 °C
Loss on Drying	≤ 0.5%
Chloride Content	24.5 - 25.5%

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