Description

Propylene Oxide-Dimethylsiloxane-Propylene Oxide Block Copolymer, Hydroxyl Terminated, Viscosity 200-300 Cst is a specialized silicone-polyether hybrid polymer, known as a reactive silicone surfactant or polyether-modified siloxane. This hydroxyl-terminated structure provides unique surface-active properties and compatibility with both organic and aqueous systems, making it a versatile chemical intermediate. It is essential for formulators in industries requiring advanced performance additives for foam control, wetting, and emulsification.

Application

• Polyurethane Foam Stabilizer: A key surfactant for stabilizing polyurethane foam systems, particularly in flexible slabstock and molded foams, ensuring uniform cell structure.
• Coatings & Inks Additive: Used to improve substrate wetting, flow, and leveling in solvent-based and high-solid coatings, as well as printing inks.
• Agricultural Adjuvant: Functions as a spray adjuvant to enhance the spreading and penetration of agrochemicals on plant surfaces.
• Personal Care & Cosmetics: Acts as an emollient and conditioning agent in hair care and skincare formulations, providing softness and improved feel.
• Industrial Defoamer Component: Serves as a critical building block in the formulation of high-performance silicone-based defoamers and antifoams for process industries.
• Adhesive & Sealant Modifier: Imparts improved adhesion, flexibility, and moisture resistance when incorporated into adhesive and sealant formulations.
• Textile & Leather Processing: Used as a softener and lubricant to enhance the handle and processing of fibers, fabrics, and leather.

Basic Information

Item	Details
Product Name	Propylene Oxide-Dimethylsiloxane-Propylene Oxide Block Copolymer, Hydroxyl Terminated, Viscosity 200-300 Cst
CAS No.	161755-53-9
Molecular Formula	(C3H6O)m·(C2H6OSi)n·(C3H6O)p
Molecular Weight	Variable (Polymer)
Synonyms	Hydroxyl-terminated Poly(propylene oxide)-block-Poly(dimethylsiloxane)-block-Poly(propylene oxide); Polyether-modified Siloxane, OH-terminated; Silicone Polyether Copolymer; Polyalkyleneoxide modified heptamethyltrisiloxane; Reactive Silicone Surfactant; Polyoxypropylene Polydimethylsiloxane Polyoxypropylene Block Copolymer; PPG-PDMS-PPG Triblock Copolymer; Dow Corning® DC 1248 (similar type)
EINECS	Contact for details

Quality Control

Our Propylene Oxide-Dimethylsiloxane-Propylene Oxide Block Copolymer is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistency in key parameters such as viscosity, hydroxyl value, and silicon content. Certificates of Analysis (COA) documenting these specifications are available upon request 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/59-77°F). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Viscosity @ 25°C	200 - 300 cSt
Hydroxyl Value (OH#)	Contact for details
Specific Gravity @ 25°C	~1.02 - 1.05
Refractive Index @ 25°C	~1.440 - 1.450
Water Content	< 0.5% (w/w)
Assay (Siloxane Content)	> 98%

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