Description

Polydimethylsiloxane CAS NO 31900-57-9 is a versatile silicone polymer, widely recognized for its exceptional thermal stability, low surface tension, and chemical inertness. This product is engineered to deliver consistent performance as a key ingredient in formulations requiring lubrication, release, or defoaming properties. It is an essential material for manufacturers in the personal care, pharmaceutical, food processing, and industrial manufacturing sectors seeking reliable silicone fluid solutions.

Application

• Antifoaming & Defoaming Agent: Critical for controlling foam in industrial processes like wastewater treatment, fermentation, pulp and paper production, and chemical manufacturing.
• Personal Care & Cosmetics: Used as an emollient and conditioning agent in lotions, creams, shampoos, and antiperspirants to provide a smooth, non-greasy feel.
• Pharmaceuticals: Employed as an excipient in topical ointments and as a lubricant in tablet and capsule manufacturing.
• Food Processing: Acts as an antifoam agent in cooking oils, syrups, and various food production lines (subject to appropriate regulatory compliance).
• Industrial Lubricants & Release Agents: Provides excellent mold release for plastics, rubber, and composites, and serves as a lubricant in high-temperature applications.
• Polishes & Coatings: Imparts water repellency, gloss, and durability to automotive, furniture, and industrial polishes.
• Electrical & Electronics: Used as a dielectric coolant and protective coating due to its thermal stability and insulating properties.
• Textile & Fiber Treatment: Applied as a softener and water repellent finish for fabrics and non-wovens.

Basic Information

Product Name	Polydimethylsiloxane
CAS No.	31900-57-9
Molecular Formula	(C2H6OSi)n
Molecular Weight	Varies by viscosity grade
Synonyms	Dimethyl Silicone Oil; Dimethylpolysiloxane; PDMS; Dimethicone; Polydimethylsiloxane Fluid; Silicone Oil; Methyl Silicone Oil; Poly(dimethylsiloxane); Dimethyl Siloxane Polymer; α-Methyl-ω-methoxypolydimethylsiloxane
EINECS	Contact for details

Quality Control

Our Polydimethylsiloxane is produced under a stringent quality management system. Each batch is tested against rigorous specifications to ensure consistency, purity, and performance. We can supply grades compliant with relevant industry standards, including food-grade (FCC) and pharmaceutical (USP/NF) where applicable. A comprehensive Certificate of Analysis (COA) documenting key parameters such as viscosity, specific gravity, refractive index, and purity is provided with every shipment.

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. For long-term storage, ensure containers are sealed to prevent moisture absorption and contamination.

Specification

Item	Specification
Appearance	Colorless, clear viscous liquid
Identification (IR)	Conforms to standard
Viscosity (25°C)	Grade-dependent (e.g., 10 - 100,000 cSt)
Specific Gravity (25°C)	0.960 - 0.980
Refractive Index (25°C)	1.400 - 1.410
Flash Point	> 300 °C
Volatile Matter	< 1.0 %

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