Description

3-(Trihydroxysilyl)Propyl Methylphosphonate, Monosodium Salt is a unique organosilicon phosphonate compound that serves as a highly effective coupling agent and surface modifier. Its bifunctional molecular structure, featuring both hydrolyzable silanol groups and a phosphonate moiety, enables strong covalent bonding to inorganic substrates while providing excellent chelating properties. This product is essential for manufacturers in the coatings, adhesives, and advanced materials sectors seeking to enhance adhesion, corrosion resistance, and surface functionality. Its monosodium salt form offers improved solubility and handling characteristics in aqueous formulations.

Application

• Metal Surface Pretreatment & Corrosion Inhibition: As a key component in conversion coatings and primers for aluminum, steel, and galvanized steel to improve paint adhesion and provide long-term corrosion protection.
• Glass & Mineral Fiber Sizing: As a coupling agent in fiberglass and mineral wool production to promote interfacial adhesion between the inorganic fibers and polymer matrices (e.g., epoxy, polyester).
• Pigment & Filler Dispersion: To modify the surface of inorganic pigments (e.g., titanium dioxide, iron oxides) and fillers (e.g., silica, calcium carbonate) for improved dispersion stability in paints, plastics, and coatings.
• Adhesive & Sealant Formulations: To enhance the bond strength and durability of adhesives and sealants on difficult substrates like glass, metals, and ceramics.
• Scale Inhibition in Water Treatment: Utilized as a threshold inhibitor to prevent calcium carbonate and calcium phosphate scale formation in industrial cooling water and boiler systems.
• Dental & Biomedical Composites: As a silane coupling agent in dental restorative materials and bone cements to strengthen the interface between bioactive glass or ceramic fillers and the resin polymer.

Basic Information

Product Name	3-(Trihydroxysilyl)Propyl Methylphosphonate, Monosodium Salt
CAS No.	84962-98-1
Molecular Formula	C4H12NaO7PSi
Molecular Weight	254.17 g/mol
Synonyms	Sodium 3-(trihydroxysilyl)propyl methylphosphonate; Mono-sodium (3-trihydroxysilyl)propyl methylphosphonate; (3-Trihydroxysilyl)propyl methylphosphonic acid monosodium salt; Methylphosphonic acid, P-[3-(trihydroxysilyl)propyl]-, monosodium salt; Silicone phosphonate coupling agent; SPCA; Phosphono-silane coupling agent; A-1792 (common trade designation)
EINECS	Contact for details

Quality Control

Our production of 3-(Trihydroxysilyl)Propyl Methylphosphonate, Monosodium Salt adheres to a strict quality management system to ensure batch-to-batch consistency and performance reliability. Each lot undergoes rigorous analytical testing, including assay (by titration or NMR), identification (IR), and determination of key impurities. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and test results is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. This material is hygroscopic (moisture-sensitive). Store in a cool, dry place at a controlled room temperature (15-25°C). Keep the original container tightly sealed when not in use to minimize exposure to atmospheric moisture, which can affect product performance. Store away from incompatible materials such as strong acids and strong oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid or solid
Identification (IR)	Conforms to reference spectrum
Assay (by Titration)	≥ 95.0 %
pH (5% aqueous solution)	6.0 - 8.0
Water Content (KF)	≤ 2.0 %
Specific Gravity (25°C)	1.25 - 1.35

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