Description

Phosphorous Acid Bis(3-Trimethylsilylpropyl) Ester (CAS NO 128942-12-1) is a specialized organosilicon derivative of phosphorous acid, valued for its unique combination of phosphorus and silicon chemistries. This compound serves as a versatile intermediate and functional additive, offering properties such as thermal stability and moisture reactivity. It is primarily utilized by manufacturers in the silicone polymer, specialty chemical, and advanced material sectors for applications requiring tailored surface properties or specific catalytic activity.

Application

• Silicone Crosslinking & Curing Agent: Acts as a reactive intermediate or catalyst in the production of heat-cured and room-temperature-vulcanizing (RTV) silicone elastomers.
• Surface Modification & Coupling Agent: Used to functionalize inorganic fillers (e.g., silica, glass) to improve their compatibility and dispersion within organic polymer matrices.
• Flame Retardant Synergist: Employed as a component in flame-retardant formulations for plastics and textiles, where phosphorus and silicon act synergistically.
• Lubricant & Grease Additive: Serves as a high-performance additive in synthetic lubricants and greases to enhance thermal stability and reduce wear.
• Adhesion Promoter: Improves the adhesion of coatings, sealants, and adhesives to difficult-to-bond substrates like metals and glass.
• Phosphorus Chemical Intermediate: A key building block for the synthesis of more complex organophosphorus compounds used in agrochemicals and pharmaceuticals.
• Polymer Stabilizer: Functions as an antioxidant or stabilizer in polymers susceptible to thermal and oxidative degradation.

Basic Information

Product Name	Phosphorous Acid Bis(3-Trimethylsilylpropyl) Ester
CAS No.	128942-12-1
Molecular Formula	C12H31O3PSi2
Molecular Weight	310.52 g/mol
Synonyms	Bis(3-Trimethylsilylpropyl) Phosphite; Phosphorous Acid Bis(3-(Trimethylsilyl)propyl) Ester; 3-(Trimethylsilyl)-1-propanol hydrogen phosphite; Tris(3-trimethylsilylpropyl) phosphite (related); Silylated alkyl phosphite; Organosilyl phosphite; (3-Trimethylsilylpropyl) phosphonite
EINECS	Contact for details

Quality Control

Our production of Phosphorous Acid Bis(3-Trimethylsilylpropyl) Ester adheres to stringent quality management protocols. Each batch undergoes rigorous analytical testing, including chromatography and spectroscopy, to ensure high purity and consistent performance. Certificates of Analysis (COA) detailing identity, assay, and impurity profiles are provided with every shipment 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent degradation by atmospheric moisture.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to reference spectrum
Assay (GC or 31P NMR)	≥ 95.0%
Water Content (Karl Fischer)	≤ 0.5%
Refractive Index (n20D)	1.430 - 1.450
Density (20°C)	0.92 - 0.96 g/mL

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