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    Related: Lubricant Additive 12-Hydroxy Stearic Acid Calcium Stearate
    • Stearic Acid CAS 57-11-4
    • Stearic Acid CAS 57-11-4

    Stearic Acid CAS 57-11-4

    Stearic acid, also called octadecanoic acid, CAS 57-11-4, is a saturated long-chain C18 fatty acid supplied as white flakes, beads, or powder for rubber, plastics, and industrial applications. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

    • CAS: 57-11-4
    • Synonyms: Octadecanoic acid, Cetylacetic acid, n-Octadecanoic acid, 1-Heptadecanecarboxylic acid
    • Einecs: 200-313-4
    • Molecular Formula: C18H36O2
    • Grade: Industrial Grade
    • Package: 25kg/bag (kraft paper bag with PE inner liner), 600kg/jumbo bag
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    Product Description

    Stearic Acid CAS 57-11-4, also called octadecanoic acid or n-octadecanoic acid, is a saturated long-chain fatty acid with the molecular formula C18H36O2 and EINECS 200-313-4.

    Synonyms: Octadecanoic acid; Cetylacetic acid; n-Octadecanoic acid; 1-Heptadecanecarboxylic acid.

    CAS: 57-11-4.

    Molecular formula: C18H36O2.

    It is supplied as white flaky, bead, or solid powder material with an acid value of about 205-210 mg KOH/g.

    The saponification value is about 206-211 mg KOH/g, and the iodine value is not more than 4.0 g I2/100g.

    The titer (congealing point) is about 54.0-57.0 °C, with Hazen color not more than 400 and moisture not more than 0.2%.

    It is insoluble in water and soluble in hot ethanol, ether, and chloroform.

    In rubber compounding it acts as a vulcanization activator, normally with zinc oxide, and helps disperse carbon black in natural and synthetic elastomers.

    In plastic extrusion it works as an external lubricant and release agent in rigid PVC pipe and profile manufacturing, reducing melt viscosity and preventing polymer adhesion to metal equipment.

    It is also used as an emulsifying matrix and thickening base in industrial metal polishes, protective barrier waxes, and textile sizing compounds.

    Store it in a cool, dry, well-ventilated warehouse away from direct sunlight, open flames, and strong oxidizing agents, below 40 °C.

    During handling, use local exhaust ventilation, NIOSH-approved particulate dust masks, safety goggles, and protective work clothing.

    Every batch undergoes gas chromatography analysis to confirm the C18 (stearic) to C16 (palmitic) carbon-chain distribution.

    Iodine value and acid value are monitored by automated titration to ensure oxidative stability, color consistency, and functional performance.

    Confirm appearance, acid value, saponification value, iodine value, titer, color, moisture, and grade as required.

    Confirm packaging with the requested quantity and destination requirements.

    For a quotation, send your intended application, required grade, quantity, preferred packaging, destination country or port, and COA, TDS, or SDS requirements.

    FAQ - Technical & Supply Chain

    • Q:

      What is Stearic Acid CAS 57-11-4?

      A: CAS 57-11-4 is stearic acid, also called octadecanoic acid, a saturated long-chain fatty acid with the molecular formula C18H36O2. It is obtained from fats and oils and is supplied as a white waxy solid in flake, granule, or powder form.
    • Q:

      What are the key specification values for industrial-grade stearic acid?

      A: For the required industrial grade, confirm the acid value, iodine value, titer (congealing point), and C16/C18 fatty-acid distribution against its COA and TDS. Confirm the grade specification and batch COA before ordering.
    • Q:

      How is Stearic Acid CAS 57-11-4 used in rubber processing?

      A: In rubber compounding it acts as a vulcanization activator, normally in combination with zinc oxide, helping improve cross-linking efficiency and process stability. It also improves filler dispersion and can contribute to better release behavior.
    • Q:

      Why is stearic acid used as a lubricant in PVC and polymer processing?

      A: Stearic acid reduces friction between the polymer melt and metal surfaces, so it functions as an external lubricant and release agent in rigid PVC and other polymer systems. It can also help prevent sticking during extrusion and molding.
    • Q:

      How should industrial stearic acid be stored?

      A: Keep the product in a cool, dry, well-ventilated area away from oxidizers, strong acids, and heat sources. Sealed bags or drums should remain closed when not in use to prevent moisture pickup and contamination.

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