Sodium Stearate TCI S0081

Chemical Identity

CAS No.: 822-16-2
PubChem: CID 2724691·SID 87575700
Formula: C18H35NaO2
Molecular weight: 306.5 g/mol
Purity: >97.0%(T)
Reference databases: ChEBI·ChemSpider·ECHA·Wikipedia

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: sodium octadecanoate
SMILES: CCCCCCCCCCCCCCCCCC(=O)[O-].[Na+]
InChIKey: RYYKJJJTJZKILX-UHFFFAOYSA-M

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Sodium Stearate from TCI is the sodium salt of stearic acid and is widely known as one of the main components of soap. In the catalogue, this material is listed under polymer additives within the materials science range. In the laboratory, Sodium Stearate works as an anionic surfactant, internal lubricant, stabilizer, and gelling agent. It has a hydrophilic carboxylate head group and a long hydrophobic alkyl tail, so it is a classic example of an amphiphilic molecule in both teaching and colloid research.

Researchers choose Sodium Stearate because its amphiphilic structure lets it form micelles and stabilize emulsions, which makes it a reliable model compound for studying interfacial behavior. It can also form gel networks in certain solvents, a property used in stick-format products such as deodorants. In polymer processing, metal stearates act as lubricants and mold release agents that help melt flow during compounding and shaping. The material is supplied as a powder that is easy to weigh and disperse, which makes it practical for formulation experiments and routine bench work where consistent handling matters.

In Indonesia, Sodium Stearate is useful to chemical engineering and polymer laboratories, to oleochemical research based on palm oil derivatives, and to teams developing cosmetics and cleaning products. University and polytechnic teaching laboratories can also use it in colloid chemistry practicals to demonstrate surfactant behavior, micelle formation, and emulsion stability. Because it is a familiar compound with well-understood behavior, it fits academic coursework, industrial formulation screening, and applied research projects that compare natural fatty acid derivatives with other additives.

TCI brochures (PDF)

Polymer Additives 2026-04-16 · p. 10
Lipids 2025-12-17 · p. 6

Related TCI products

Colloid chemistry teaching: its hydrophilic carboxylate head and hydrophobic alkyl tail make it a clear, classic example for demonstrating amphiphilic molecules and micelle formation to students.
Emulsion stabilization studies: as an anionic surfactant, Sodium Stearate helps stabilize oil-in-water systems, so it suits experiments that compare emulsifier performance and interfacial behavior.
Polymer processing and compounding: metal stearates act as internal lubricants and mold release agents, so this compound is a good fit for trials on melt flow and processing behavior.
Gel and stick formulation development: its ability to form gel networks in certain solvents supports research into solid stick products such as deodorants and similar personal care formats.
Oleochemical and palm-derivative research: as the sodium salt of a common fatty acid, it is a useful reference material for Indonesian projects studying soaps, surfactants, and palm-based derivatives.

Brand	TCI (product code S0081)
CAS number	822-16-2
Molecular formula	—
Purity	—
Category	Materials Science > Polymer/Macromolecule Reagents > Polymer Additives
Pack sizes	please contact AMI Scientific to confirm which pack sizes are currently available
Physical form	powder
Storage	keep tightly closed in a cool, dry place; follow the manufacturer's label and SDS

Store Sodium Stearate in its original, tightly closed container in a cool, dry, well-ventilated area, away from moisture and incompatible materials such as strong acids and strong oxidizing agents. Reseal the container after each use so the powder does not absorb humidity or pick up contamination. When weighing or transferring the powder, wear standard laboratory protective equipment, including gloves, safety glasses, and a lab coat. Avoid generating dust and avoid inhaling it, and work in a fume hood or ventilated area when handling larger amounts. Label secondary containers clearly. Always check the supplier's Safety Data Sheet for detailed hazard, first-aid, and disposal guidance before use.

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