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CAS Number: 9005-66-7
Product Name: Tween 40 (also known as Polyoxyethylene Sorbitan Monopalmitate)
Common Names: TWEEN 40, Spontex 40, Polyethoxylated Palmitic Acid, Sorbitan Monopalmitate, and more
Chemical Formula: C22H42O6·(C2H4O)n
Grade: CP (Chemical Pure)
Hydroxyl Value: 90–107 mg KOH/g
Acid Value: ≤2.0 mg KOH/g
Saponification Value: 40–50 mg KOH/g
Heavy Metals: ≤0.001%
Moisture Content: ≤3.0%
Appearance: A light yellow liquid that may form a gel over time.
Solubility: Fully soluble in water, methanol, ethanol, isopropanol, ethylene glycol, and cottonseed oil; insoluble in vegetable oils and mineral oils.
Density: Approximately 1.08 g/cm³
Viscosity: 400–600 mPa·s
HLB Value: 15.6
Flash Point: >149°C
Applications: Widely used in biochemical research as a non-ionic surfactant. It serves as a gas chromatographic fixative (up to 140°C), useful for the separation and analysis of fatty acid esters, alcohols, ketones, and halides. Also acts as a water-soluble emulsifier, solubilizer, antistatic agent, and fiber lubricant in the textile industry.
Storage: Store at room temperature (RT).
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