What is Stearic Acid CAS 57-11-4?

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.

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

Industrial grades are commonly controlled by titer, acid value, and iodine value. Typical ranges include a titer around 54-57 degrees C, acid value around 196-211 mg KOH/g, and low iodine value, usually about 2 g I2/100g or less.

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

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.

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

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.

How should industrial stearic acid be stored?

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.

Stearic Acid CAS 57-11-4

Stearic Acid (CAS 57-11-4) is a saturated, long-chain fatty acid derived from the hydrolysis of triglycerides, serving as a critical processing agent within the broader category of Rubber Auxiliaries & Antioxidants. Operating as a highly effective internal lubricant and vulcanization activator, this stable octadecanoic acid reduces surface tension in polymer blends, making the cetylacetic acid integral to the compounding of natural and synthetic rubber profiles. Its amphiphilic molecular structure provides excellent particulate dispersion capabilities and thermal stability when deployed as a fundamental n-octadecanoic acid formulation ingredient in demanding plastic extrusion and molding environments. To support large-scale continuous manufacturing schedules, our facility maintains extensive bulk supply capabilities, ensuring consistent iodine and acid values with customized specifications to meet precise rheological parameters, all backed by competitive factory pricing and comprehensive technical documentation including MSDS, TDS, COA.

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

Request a quote

Share:

Product Description

Technical Data

Physicochemical Properties	Standard Specification (Standard Industrial 1801 Grade)
Appearance	White flaky, bead, or solid powder
Acid Value	205 – 210 mg KOH/g
Saponification Value	206 – 211 mg KOH/g
Iodine Value	≤ 4.0 g I2/100g
Titer (Congealing Point)	54.0 – 57.0 °C
Color (Hazen)	≤ 400
Moisture Content	≤ 0.2%
Solubility	Insoluble in water; soluble in hot ethanol, ether, and chloroform

Applications:

Rubber Compounding: Functions as a vital vulcanization activator and carbon black dispersion agent in natural and synthetic elastomer formulations, enhancing the cross-linking efficiency of tire treads and industrial conveyor belts.
Plastic Extrusion: Utilized as a highly effective external lubricant and release agent in rigid PVC pipe and profile manufacturing, significantly reducing melt viscosity and preventing polymer adhesion to metallic processing equipment.
Industrial Polishes & Coatings: Applied as an emulsifying matrix and thickening base in the formulation of industrial metal polishes, protective barrier waxes, and heavy-duty textile sizing compounds.

Where a hydroxylated C18 feedstock is specified for lithium-grease or gelling systems, 12-Hydroxy Stearic Acid is a separate fatty-acid material.

Storage & Safety:

Storage Conditions: Store in a cool, dry, and well-ventilated warehouse environment away from direct sunlight, open flames, and strong oxidizing agents. Ambient storage temperatures should be maintained below 40°C to prevent the agglomeration or melting of flakes/beads.
Safety & Handling: While physiologically inert, the handling of fatty acid powders can generate combustible dust. Industrial operations require standard local exhaust ventilation. Personnel must utilize NIOSH-approved particulate dust masks, safety goggles, and protective work clothing to prevent mild mechanical irritation to the respiratory tract and eyes.

Quality Assurance:

Our production facility enforces rigorous quality control protocols aligned with ISO 9001 industrial standards. Every manufacturing batch undergoes advanced Gas Chromatography (GC) analysis to verify the precise C18 (stearic) to C16 (palmitic) carbon chain distribution ratio. We continuously monitor iodine values and acid values via automated titration systems to ensure the oxidative stability, color consistency, and functional performance of the fatty acid matrix comply fully with international bulk manufacturing specifications.

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: Industrial grades are commonly controlled by titer, acid value, and iodine value. Typical ranges include a titer around 54-57 degrees C, acid value around 196-211 mg KOH/g, and low iodine value, usually about 2 g I2/100g or less.
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.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

Current Language

Change Language