Overview
Stearic anhydride, also known as octadecanoic anhydride, is a waxy solid derived from stearic acid. It is widely used in industrial applications due to its hydrophobic properties and stability. The compound is synthesized through the dehydration of stearic acid, making it a key intermediate in various chemical processes. Stearic anhydride is particularly valued in the production of lubricants and plasticizers, where its ability to repel water and reduce friction is essential. Its non-reactive nature under normal conditions makes it suitable for use in cosmetics and personal care products, where it acts as an emollient and thickening agent.
Physical and Chemical Properties
Stearic anhydride is characterized by its white or off-white waxy appearance and a melting point ranging between 70-75°C. It is insoluble in water but readily dissolves in organic solvents such as ethanol and ether. The compound has a density of approximately 0.9 g/cm³ and is stable under normal storage conditions. One of the key chemical properties of stearic anhydride is its reaction with water to form stearic acid. This property is important in applications where controlled release of stearic acid is desired. The compound is also resistant to oxidation, making it suitable for long-term storage and use in high-temperature environments.
Main Applications
Stearic anhydride finds extensive use in the lubricants industry, where it serves as a friction-reducing agent in greases and oils. Its hydrophobic nature makes it ideal for applications requiring water resistance. In the plastics industry, it is used as a plasticizer to improve the flexibility and durability of polymer products. The cosmetics industry utilizes stearic anhydride as an emollient and thickening agent in creams, lotions, and other personal care products. Its ability to form a protective barrier on the skin makes it a popular ingredient in moisturizers. Additionally, the compound is used in chemical synthesis as an intermediate for producing esters and other derivatives.
Safety and Storage
Stearic anhydride should be handled with care to avoid inhalation or skin contact. Protective equipment such as gloves and goggles is recommended when working with the compound. In case of contact, rinse thoroughly with water and seek medical advice if irritation persists. Storage conditions for stearic anhydride include keeping it in a cool, dry place away from moisture and oxidizing agents. Properly sealed containers are essential to prevent degradation. The compound is stable under normal conditions but should be kept away from open flames and high temperatures to avoid decomposition.
B2B Procurement Guide
When procuring stearic anhydride, it is crucial to verify the purity and quality of the product. Suppliers should provide a Certificate of Analysis (COA) and a Safety Data Sheet (SDS) to ensure compliance with safety and regulatory standards. Buyers should also consider the packaging options, as bulk purchases may offer cost savings but require proper storage facilities. Price ranges for stearic anhydride typically vary between $5-$10 per kg, depending on the purity and quantity ordered. Establishing long-term relationships with reliable suppliers can ensure consistent quality and timely delivery. Buyers should also inquire about the supplier's ability to meet specific technical requirements, such as particle size or moisture content, if applicable.
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