Description

3,9-Diethoxy-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane is a specialized organophosphorus compound, specifically a cyclic phosphonate ester, known for its unique spirocyclic structure. This compound serves as a highly effective reactive flame retardant and a key intermediate in the synthesis of advanced polymeric materials. It is essential for manufacturers in the polymer, plastics, and specialty chemical industries seeking to enhance the fire safety and thermal stability of their products without compromising mechanical properties.

Application

• Reactive Flame Retardant for Polymers: Incorporated into the polymer backbone of polyesters, polyurethanes, and epoxy resins to provide durable, non-leaching flame retardancy.
• Synthesis Intermediate: Used in the production of more complex phosphonate esters and phosphorus-containing oligomers for specialized applications.
• Additive for Engineering Plastics: Enhances the fire resistance of high-performance plastics like PBT and PET used in electrical and electronic components.
• Cross-linking Agent: Functions as a cross-linker in certain resin systems, improving thermal and chemical resistance.
• Textile Treatment: Applied in coatings or finishes for technical textiles to impart flame-retardant properties.
• Adhesive & Sealant Formulations: Used to improve the fire safety profile of industrial adhesives and sealants.

Basic Information

Product Name	3,9-Diethoxy-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane
CAS No.	7093-41-6
Molecular Formula	C9H20O8P2
Molecular Weight	318.20 g/mol
Synonyms	3,9-Diethoxy-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane; Spirocyclic Pentaerythritol Bisphosphonate; PEPA Derivative; Bis(5,5-dimethyl-2-ethoxy-1,3,2-dioxaphosphorinanyl) oxide; 2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-diethoxy-; Reactive Spiro Phosphonate Ester; Flame Retardant FR PEPA
EINECS	Contact for details

Quality Control

Our production of 3,9-Diethoxy-2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane adheres to strict quality management protocols. Every batch undergoes rigorous analytical testing, including chromatography and spectroscopy, to ensure high purity and consistent performance. Certificates of Analysis (COA) documenting identity, assay, and impurity profiles are available upon request to support your quality assurance and regulatory compliance needs.

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). Keep the container tightly sealed under an inert atmosphere (e.g., nitrogen) to prevent moisture absorption and degradation. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	105 - 110 °C
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 10 ppm

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