Description

Tween 65 is a non-ionic surfactant belonging to the polysorbate family, specifically polyoxyethylene (20) sorbitan tristearate. Its primary function is as a highly effective emulsifier and solubilizer, crucial for stabilizing mixtures of oil and water. This makes it an indispensable ingredient for formulators in the pharmaceutical, cosmetic, and food industries who require consistent product texture and shelf stability. Its reliable performance under various conditions supports the development of high-quality creams, ointments, and food emulsions.

Application

• Pharmaceuticals: Used as an emulsifying agent in topical creams, ointments, and lotions, and as a solubilizer for fat-soluble vitamins in injectable formulations.
• Cosmetics & Personal Care: A key ingredient in creams, lotions, and makeup for its emulsifying and stabilizing properties, ensuring smooth texture and consistency.
• Food Industry: Functions as an emulsifier in baked goods, dairy products (like ice cream), and edible spreads to improve texture and prevent separation.
• Industrial Applications: Acts as a dispersing agent, lubricant, and anti-static agent in textile processing, plastics, and other chemical manufacturing processes.
• Laboratory Research: Employed as a detergent and wetting agent in biochemical and cell culture applications.

Basic Information

Product Name	Tween 65
CAS No.	9005-71-4
Molecular Formula	C100H194O28 (Typical)
Molecular Weight	~1840 g/mol (Average)
Synonyms	Polysorbate 65; Polyoxyethylene (20) sorbitan tristearate; POE (20) sorbitan tristearate; Sorbitan, trioctadecanoate, poly(oxy-1,2-ethanediyl) derivs.; Tween® 65; Ethoxylated sorbitan tristearate; PEG-20 sorbitan tristearate
EINECS	500-020-5

Quality Control

Our Tween 65 is manufactured under a strict quality management system to ensure batch-to-batch consistency and reliability. We offer grades suitable for various applications, including those compliant with food-grade (FCC) and pharmaceutical (USP/NF) standards where applicable. Comprehensive testing is performed, and a Certificate of Analysis (COA) detailing key parameters such as saponification value, hydroxyl value, and fatty acid composition is provided with every shipment.

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). This product is hygroscopic (moisture-sensitive); ensure the container is sealed after each use to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Yellow to amber waxy solid
Identification (IR)	Complies
Assay (Saponification Value)	85 - 100
Hydroxyl Value	40 - 60
Acid Value	≤ 2.0
Water Content (KF)	≤ 3.0%
Residue on Ignition	≤ 0.25%
Heavy Metals (as Pb)	≤ 10 ppm

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