Description

3,9-Dichloro-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane is a high-purity, halogenated organophosphorus compound with a unique spirocyclic structure. This compound serves as a critical intermediate and reactive monomer for imparting flame retardancy and thermal stability to advanced polymer systems. It is essential for manufacturers in the plastics, electronics, and specialty chemical industries seeking to enhance the safety and performance of their materials.

Application

• As a key reactive intermediate in the synthesis of halogenated phosphate ester flame retardants.
• As a monomer for the production of inherently flame-retardant polymers and epoxy resins.
• In the formulation of flame-retardant additives for engineering plastics, polyurethanes, and unsaturated polyesters.
• For research and development of novel phosphorus-based flame retardants with improved environmental profiles.
• In the manufacturing of specialty chemicals for the electronics industry, providing thermal management properties.
• As a building block for creating cross-linking agents and modifiers for high-performance coatings and adhesives.

Basic Information

Product Name	3,9-Dichloro-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane
CAS No.	3643-70-7
Molecular Formula	C5H8Cl2O4P2
Molecular Weight	272.96 g/mol
Synonyms	3,9-Dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane; Spirocyclic Pentaerythritol Bisphosphorate Dichloride; PEPA-Dichloride; 2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-dichloro-; Spirocyclic Phosphonate Chloride; BPDC; Pentaerythritol Phosphonate Chloride
EINECS	Contact for details

Quality Control

Our production of 3,9-Dichloro-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including assay, purity, and identity confirmation, to ensure it meets precise customer specifications and industry standards. A detailed Certificate of Analysis (COA) is provided with each shipment to guarantee traceability, consistency, and reliability.

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 moisture-sensitive (hygroscopic); keep the container tightly sealed under an inert atmosphere such as nitrogen to prevent hydrolysis and degradation. Separate from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Water Content (KF)	≤ 0.5%
Chloride Content	Contact for details

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