Description

Calcium 2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane-3,9-Diolate 3,9-Dioxide is a specialized organophosphorus compound known for its role as a high-performance flame retardant and thermal stabilizer. This compound is valued for its ability to impart excellent fire resistance while maintaining good compatibility with various polymer matrices. It is primarily sought by manufacturers in the plastics, polymer, and specialty chemical industries for applications requiring enhanced material safety and durability under high-temperature conditions.

Application

• Flame Retardant for Engineering Plastics: Used as an additive in polyamides (nylon), polyesters (PET, PBT), and other high-performance thermoplastics to meet stringent fire safety standards (e.g., UL 94).
• Thermal Stabilizer for Polymers: Enhances the thermal-oxidative stability of polymers during processing and extends the service life of finished products.
• Additive for Intumescent Coatings and Systems: Acts as a key component in fire-protective coatings that expand to form an insulating char layer.
• Synergist in Halogen-Free Flame Retardant Formulations: Often combined with nitrogen-based compounds (e.g., melamine derivatives) to achieve superior flame retardant efficiency.
• Wire and Cable Insulation: Incorporated into polymer compounds used for insulating materials to improve fire resistance.
• Electronic Component Encapsulation: Used in potting compounds and encapsulants to protect sensitive electronics from heat and fire.
• Textile Back-Coating for Fire-Resistant Fabrics: Applied in coatings for industrial and protective textiles.
• Specialty Additive for Adhesives and Sealants: Imparts flame retardancy to high-performance adhesives used in construction and transportation.

Basic Information

Product Name	Calcium 2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane-3,9-Diolate 3,9-Dioxide
CAS No.	97907-57-8
Molecular Formula	C5H6CaO8P2
Molecular Weight	304.11 g/mol
Synonyms	Calcium Bis(monoethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate); Calcium 3,5-di-tert-butyl-4-hydroxybenzylphosphonate monoethyl ester; Calcium salt of monoethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate; Calcium phosphonate flame retardant; Calcium phosphonate stabilizer; Spirocyclic calcium phosphonate; Calcium 2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane-3,9-diolate dioxide
EINECS	Contact for details

Quality Control

Our production of Calcium 2,4,8,10-Tetraoxa-3,9-Diphosphaspiro[5.5]Undecane-3,9-Diolate 3,9-Dioxide adheres to a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, performance, and compliance with customer specifications. Certificates of Analysis (COA) detailing key parameters are provided and available upon request.

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 material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after opening to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Calcium Content	12.5 - 13.5 %
Phosphorus Content	19.5 - 20.5 %
Loss on Drying	≤ 1.0 %
Residue on Ignition	≤ 0.5 %
Particle Size (D50)	< 50 μm

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