Description

Calcium Bis[Monoethyl(3,5-Di-tert-Butyl-4-Hydroxylbenzyl)Phosphonate] is a high-performance organophosphorus antioxidant and stabilizer. This compound is valued for its exceptional ability to inhibit oxidative degradation and thermal aging in polymers and synthetic materials. It is a critical additive for manufacturers in the plastics, rubber, and synthetic fiber industries seeking to enhance product longevity and performance under demanding conditions.

Application

• Polymer Stabilization: Primary antioxidant for polyolefins (PP, PE), polyamides, and engineering plastics to prevent thermal and oxidative degradation during processing and end-use.
• Rubber Industry: Protects synthetic rubbers (SBR, NBR, EPDM) from aging, maintaining elasticity and mechanical properties.
• Synthetic Fibers: Additive in the production of polyamide and polyester fibers to improve thermal stability and color retention.
• Adhesives and Sealants: Enhances the shelf-life and durability of hot-melt and reactive adhesive formulations.
• Lubricant Additive: Used in synthetic lubricants and greases to prevent oxidation and viscosity increase.
• Masterbatch Production: A key component in antioxidant and stabilizer concentrate formulations for easier dispersion in polymers.

Basic Information

Product Name	Calcium Bis[Monoethyl(3,5-Di-tert-Butyl-4-Hydroxylbenzyl)Phosphonate]
CAS No.	65140-91-2
Molecular Formula	C34H52CaO6P2
Molecular Weight	666.78 g/mol
Synonyms	Calcium bis(monoethyl(3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate); Irganox 1425; Calcium (3,5-di-tert-butyl-4-hydroxybenzylphosphonate monoethyl ester); Antioxidant 1425; Calcium phosphonate antioxidant; Bis[2,4-di-tert-butyl-6-((ethylphosphonato)methyl)phenyl] calcium; Ethanephosphonic acid, P-[(3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)methyl]-, calcium salt (2:1)
EINECS	265-549-1

Quality Control

Our production of Calcium Bis[Monoethyl(3,5-Di-tert-Butyl-4-Hydroxylbenzyl)Phosphonate] adheres to stringent quality management systems. Every batch undergoes comprehensive analytical testing, including HPLC for assay and purity, to ensure it meets precise specifications for use in polymer stabilization. Certificates of Analysis (COA) documenting identity, purity, and physical properties are available upon request to support your quality assurance protocols.

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 easily oxidized; for long-term storage, maintaining an inert atmosphere (e.g., under nitrogen) in the container headspace is recommended to preserve efficacy.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Calcium Content	5.8 - 6.2 %
Loss on Drying	≤ 0.5 %
Melting Point	220 - 230 °C
Ash Content	≤ 0.1 %

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