Stearic Anhydride TCI S0083

Chemical Identity

CAS No.: 638-08-4
PubChem: CID 69485·SID 87575701
Formula: C36H70O3
Molecular weight: 550.9 g/mol
Purity: >97.0%(T)

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: octadecanoyl octadecanoate
SMILES: CCCCCCCCCCCCCCCCCC(=O)OC(=O)CCCCCCCCCCCCCCCCC
InChIKey: WVJVHUWVQNLPCR-UHFFFAOYSA-N

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Berat 25g 500g

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Stearic Anhydride from TCI is a carboxylic acid anhydride formed from two molecules of stearic acid. It belongs to the non-heterocyclic building block category and works mainly as an acylating agent, a reagent that attaches a stearoyl group to other molecules. In the laboratory, chemists use it to prepare long-chain esters and amides. It is also widely used to modify natural polymers such as cellulose and starch so that they become more hydrophobic, and to synthesise lipid derivatives for research and material development.

Researchers choose Stearic Anhydride because it is more reactive than free stearic acid. Acylation reactions can therefore run under milder conditions without an extra activating agent. Compared with stearoyl chloride, the anhydride is generally easier to handle and does not release hydrogen chloride, because its by-product is stearic acid. The saturated C18 chain gives the final product strong hydrophobic character, which is valuable when water repellency or reduced moisture uptake is the goal. These features make it a practical and dependable reagent for controlled stearoylation work.

In Indonesia, Stearic Anhydride is relevant to organic chemistry, food technology, and advanced materials laboratories, particularly groups that modify cassava starch and cellulose. University research groups, government research institutes, and industrial R&D teams can use it to explore hydrophobic starch esters, modified cellulose materials, and lipid-based compounds. The 25 g and 500 g pack sizes suit both small-scale synthesis research and larger material development work, so laboratories can match the quantity to the stage of their project.

Related TCI products

Esterification of alcohols: The anhydride acylates hydroxyl groups efficiently and forms long-chain stearate esters under milder conditions than free stearic acid would require.
Amide synthesis: Stearic Anhydride reacts with amines to give stearoyl amides, and it avoids the hydrogen chloride by-product that comes with stearoyl chloride.
Hydrophobic modification of starch: Researchers use it to graft stearoyl chains onto starch, including cassava starch, to increase water resistance for food and packaging material studies.
Cellulose surface modification: The saturated C18 chain gives cellulose strong hydrophobic character, which supports the development of water-repellent fibres, films, and composite materials.
Synthesis of lipid derivatives: It is a convenient stearoyl source for building lipid-like molecules in biochemical, formulation, and materials research, and its only by-product is stearic acid.

Brand	TCI (product code S0083)
CAS number	638-08-4
Molecular formula	—
Purity	—
Category	Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
Pack sizes	25 g and 500 g
Physical form	—
Storage	keep tightly closed in a cool, dry place. Refer to the label and SDS for specific conditions.

Chemical type: carboxylic acid anhydride of stearic acid (C18 saturated chain)

Store Stearic Anhydride in its original, tightly sealed container in a cool, dry, well-ventilated area, away from moisture. Moisture gradually hydrolyses acid anhydrides back to the parent acid, so close the container promptly after each use. Keep it away from strong oxidisers, strong bases, amines, and alcohols during storage. Wear safety glasses, gloves, and a lab coat when handling it, avoid inhaling dust or contact with skin and eyes, and weigh it in a fume hood or ventilated area. Always follow the supplier's Safety Data Sheet (SDS) and your local laboratory safety procedures for handling and disposal.

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