Description

Methyl Hydrogen Octadecylphosphonate is a high-purity organophosphorus compound with a long alkyl chain, serving as a versatile intermediate and functional additive. Its molecular structure provides excellent surface-active and chelating properties, making it valuable for modifying material characteristics and enhancing performance in demanding formulations. This product is essential for manufacturers in the specialty chemicals, polymer processing, and metalworking industries seeking to improve product stability, compatibility, and functionality.

Application

• As a key intermediate in the synthesis of specialized phosphonate-based scale and corrosion inhibitors for industrial water treatment.
• As a surface modifier and coupling agent to improve the dispersion and adhesion of fillers in polymer composites and engineering plastics.
• As a chelating agent and stabilizer in the formulation of high-performance lubricants and metalworking fluids.
• As a precursor for producing flame retardants and plasticizers with enhanced thermal stability for polymer applications.
• As an additive in textile auxiliaries to impart softening, anti-static, or water-repellent properties to fabrics.
• In the research and development of novel surfactants and emulsifiers for agrochemical and coating formulations.

Basic Information

Product Name	Methyl Hydrogen Octadecylphosphonate
CAS No.	25371-55-5
Molecular Formula	C₁₉H₄₁O₃P
Molecular Weight	348.50 g/mol
Synonyms	Octadecylphosphonic Acid Monomethyl Ester; Methyl Octadecylphosphonate; Stearylphosphonic Acid Methyl Ester; Monomethyl Octadecylphosphonate; n-Octadecylphosphonic Acid Methyl Ester; Phosphonic Acid, Octadecyl-, Monomethyl Ester; Methyl Hydrogen Stearylphosphonate; C18 Phosphonate Ester
EINECS	Contact for details

Quality Control

Our Methyl Hydrogen Octadecylphosphonate is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure consistent purity, identity, and performance. A detailed Certificate of Analysis (COA) confirming specifications for assay, appearance, and key impurities is provided with every shipment to guarantee it meets the rigorous standards required for industrial and research applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents and strong bases. The product may be hygroscopic; ensure containers are sealed after use to minimize moisture absorption.

Specification

Item	Specification
Appearance	White to off-white waxy solid or flakes
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 97.0%
Melting Point	90 - 100 °C
Heavy Metals (as Pb)	≤ 10 ppm
Loss on Drying	≤ 0.5%

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