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Magnesium Stearate

Chemical Name: Octadecanoic Acid, Magnesium Salt

CAS#: 557-04-0

  • Product Details & Information
    Magnesium stearate is an additive commonly found in rubber, plastics, pharmaceuticals and many other products. Created when sodium stearate reacts with magnesium sulfate, it is also known as octadecanoic acid and magnesium salt. To support a wide range of potential applications, Acme-Hardesty manufactures magnesium stearate in kosher, NF and polymer grades.
  • Uses & Applications

    Rubber: De-Dusting Agent, Internal Lubricant, External Lubricant

    Food and Beverage: Flow Enhancer and Anti-Caking Agent

    Plastics: ABS / SAN Internal Lubricants

    Pharmaceuticals: Excipient, Mold Release Agent for Tableting

    CASE: Lubricants, Neutralizer

    Nutraceuticals: Excipient, Mold Release Agent for Tableting

    Industry Applications

    Magnesium stearate is used in the manufacture of pharmaceutical tablets, nutritional supplements and nutraceuticals. In these applications, it serves as an anti-adherent, excipient, mold-release agent and lubricant. It is also used in the processing of rubber and plastics as a de-dusting agent and lubricant. In food and beverage manufacturing, it is a flow enhancer, binder and anti-caking agent, as well as an important component of hard candies and baby formula, among other things.

  • Grades and Forms Available

    Kosher, NF, Polymer Grade, Powder

    Product Characteristics

    Magnesium stearate can be derived from both animal fats and vegetable oils. At Acme-Hardesty, our product is entirely plant-based, as well as GMO- and residual-solvent-free. At no point do we test any of our products on animals. We also strive to ensure our magnesium stearate is free of peanuts, tree nuts, dairy, eggs, fish, gluten and other common allergens. Our magnesium stearate can be used in almost any application. For a complete list of specs and potential uses, download the product data sheet.

  • Packaging

    Packaging: Bags

    Storage and Handling Recommendations

    Acme-Hardesty offers magnesium stearate in bags as a fine white powder. It poses an explosive dust risk if not handled in a properly ventilated environment. The melting point of magnesium stearate is between 130 and 150ºC. It will remain stable under normal storage and transport conditions, but you should keep it away from sparks, open flames and sources of heat. Wear protective gloves and an appropriate respirator at all times.

    Download the magnesium powder MSDS for a complete list of precautions when working with this product.

    Request a Quote Today

    Acme-Hardesty magnesium stearate is used by many of North America’s leading manufacturers. With a more than 70-year history of leadership in the field of sustainable chemical production, we are an ideal partner to any business concerned about environmental responsibility. To obtain a quote for any quantity of magnesium stearate, contact us today.

  • Shelf Life

    Two Years from Date of Manufacture when stored according to MSDS recommendations

  • INCI Name

    Magnesium Stearate

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Sales Specifications of Magnesium Stearate NF Kosher Powder

ParametersSpecificationsTest Methods
Magnesium Content % 4 – 5
Identification A Conforms
Identification B Conforms
Microbial Limits:
Aerobic microbial count 1000 per gram maximum
Total molds and Yeasts count 500 per gram maximum
Salmonella Negative
Escherichia Coli Negative
Acidity/Alkalinity Conforms
Loss on Drying % 5.5 maximum
Heavy Metals (Pb), ppm <10
Organic Volatile Impurities Conforms
Chlorides % 0.1 maximum
Sulfates % 1.0 maximum
Residual Solvents 7 – 9
Free Fatty Acid % 1.5 maximum
Melting Point, ºC 130 – 150
Fineness (residue on 325 mesh) % 0.5 maximum
Bulk Density (g/cc) 0.25 max
Specs & MSDS of Magnesium Stearate NF Kosher Powder