Stearic Acid: Lubricant, Emulsifier and Consistency Agent
Stearic acid (octadecanoic acid) is a saturated C18 fatty acid that occurs naturally in animal fats and vegetable oils. Pharmaceutical grades typically contain a mixture of stearic acid (≥40%) and palmitic acid, designated as Stearic Acid 50 (type I) or Stearic Acid 70 (type II) per USP-NF. It is a multifunctional excipient serving as a tablet lubricant, emulsifier, and consistency agent in semi-solid formulations.
Product Profile
| CAS Number | 57-11-4 |
|---|---|
| Molecular Formula | C₁₈H₃₆O₂ |
| Appearance | White to yellowish-white waxy solid, flakes, or powder |
| Function | Lubricant / emulsifier / thickener / stabiliser |
| Typical Use Level | 1–5% as tablet lubricant; 2–10% as emulsifier in creams |
| Compendial Grade | EP / USP-NF / JP |
Formulation Applications
In tablet compression, stearic acid is an alternative lubricant to magnesium stearate, offering the advantage of not inhibiting dissolution to the same degree. In oil-in-water creams and lotions, it serves a dual role: as an emulsifier (when partially neutralised with a base such as triethanolamine to form a soap-emulsifier in situ) and as a consistency agent that builds viscosity and body. Stearic acid is also used in suppository bases to raise the melting point and increase hardness. In personal care, it is the primary thickener in vanishing cream formulations and a co-emulsifier in cleansing bars.
Why Source from TCS
TCS supplies Stearic Acid in pharmaceutical and technical grades to formulators across Europe. Available in standard packaging with flexible quantities for R&D through production scale. Contact us with your application and volume requirements.
FAQ
What information should be included in an inquiry for Stearic Acid –57-11-4?
A useful inquiry normally includes the product name, target application, estimated quantity, destination market, and any specific documentation or packaging requests.
How is Stearic Acid –57-11-4 usually evaluated for sourcing?
This product is positioned for excipient sourcing where formulation fit, dosage form, handling, and repeat purchasing requirements need to be reviewed together with commercial supply conditions.
What documentation and commercial points are commonly reviewed before buying Stearic Acid –57-11-4?
For excipient sourcing, teams usually discuss the intended dosage form, formulation role, packaging format, order volume, and the routine documentation needed for qualification and purchasing.
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If your team already has a target application, estimated quantity, destination market, or documentation requirements, send those details so the commercial response can be prepared more efficiently.