Description

Stearic Anhydride is a high-purity organic compound derived from stearic acid, serving as a versatile intermediate and reagent in advanced chemical synthesis. Its primary value lies in its ability to act as an efficient acylating agent, introducing the stearoyl group into target molecules to modify properties like hydrophobicity, lubricity, and stability. This makes it an essential raw material for manufacturers in the pharmaceutical, personal care, and specialty polymer industries, where precise chemical modification is required for product performance.

Application

• Pharmaceutical Intermediates: Used in the synthesis of active pharmaceutical ingredients (APIs) and prodrugs, particularly for esterification and acylation reactions to improve drug lipophilicity.
• Personal Care & Cosmetics: Acts as a key ingredient in the production of emulsifiers, opacifiers, and viscosity modifiers for creams, lotions, and makeup products.
• Polymer & Resin Modification: Employed as a chain modifier or internal lubricant in the production of specialty polymers, plastics, and synthetic resins to enhance processing and final material properties.
• Lubricant & Grease Additives: Serves as a precursor for manufacturing metallic stearates and other compounds that function as thickeners and anti-wear agents in industrial lubricants.
• Textile & Fiber Treatment: Utilized in surface treatments and finishes to impart water-repellent and softening characteristics to fabrics and non-woven materials.
• Research & Development: A valuable reagent in organic chemistry labs for academic and industrial R&D projects involving esterification and acylation studies.

Basic Information

Item	Details
Product Name	Stearic Anhydride
CAS No.	638-08-4
Molecular Formula	C36H70O3
Molecular Weight	550.95 g/mol
Synonyms	Octadecanoic anhydride; Stearic acid anhydride; Distearic anhydride; Stearoyl stearate; n-Octadecanoic acid anhydride; Anhydride stearique (French); Stearinsäureanhydrid (German)
EINECS	211-318-1

Quality Control

Our Stearic Anhydride is produced under a stringent quality management system to ensure batch-to-batch consistency and reliability. Each lot undergoes comprehensive analytical testing, including assay, identification, and impurity profiling, to meet exacting customer requirements. Certificates of Analysis (COA) documenting purity and key specifications are provided with every shipment and are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent degradation from atmospheric moisture. Keep away from strong oxidizing agents, strong bases, and sources of heat.

Specification

Item	Specification
Appearance	White to off-white flakes or powder
Identification (IR)	Conforms
Assay (Titration)	≥ 98.0 %
Melting Point	70 - 75 °C
Acid Value	≤ 5.0 mg KOH/g
Heavy Metals (as Pb)	≤ 10 ppm
Loss on Drying	≤ 0.5 %

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