Description

Magnesium Stearate CAS NO 557-04-0 is a fine, white, precipitated powder consisting of a mixture of magnesium salts of stearic and palmitic acids. This compound serves as a crucial multifunctional excipient and lubricant, valued for its ability to prevent ingredients from sticking to manufacturing equipment and to each other. It is an essential material for manufacturers in the pharmaceutical, food, cosmetic, and plastics industries seeking reliable processing aids and flow agents.

Application

• Pharmaceutical Tablet & Capsule Manufacturing: Primarily used as a non-toxic lubricant and anti-adherent in powder formulations to ensure smooth tablet ejection from dies and to prevent sticking during compression.
• Food & Nutritional Supplement Production: Employed as a release agent, binder, and emulsifier (food additive E470b) in the production of confectionery, dried foods, and supplement capsules.
• Cosmetics & Personal Care: Acts as a texture enhancer, anti-caking agent, and lubricant in products like pressed powders, eyeshadows, and lotions.
• Plastics & Polymer Processing: Functions as an acid scavenger, lubricant, and mold release agent during the processing of PVC and other polymers to improve surface finish and prevent degradation.
• Paints & Coatings: Used as a flatting and sanding agent to modify the gloss and texture of surface coatings.
• Industrial Applications: Serves as a dusting powder for rubber products and as a processing aid in various powder metallurgy and ceramic applications.

Basic Information

Product Name	Magnesium Stearate
CAS No.	557-04-0
Molecular Formula	Mg(C18H35O2)2
Molecular Weight	591.27 g/mol
Synonyms	Octadecanoic acid, magnesium salt; Dibasic magnesium stearate; Magnesium distearate; Stearic acid, magnesium salt; E470b; Synpro® Magnesium Stearate (Various Grades); Ligamed MF-2-V; Petrac® MG 20 NF
EINECS	209-150-3

Quality Control

Our Magnesium Stearate is produced and tested under strict quality management systems to ensure batch-to-batch consistency and compliance with major pharmacopeial and food standards. We offer grades that conform to USP-NF, EP, BP, JP, and FCC specifications. A comprehensive Certificate of Analysis (COA) detailing identity, assay, heavy metals, loss on drying, and microbial limits is provided with every shipment to guarantee product integrity for your critical applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and must be kept away from sources of moisture and strong oxidizing agents to prevent caking and maintain its free-flowing properties.

Specification

Item	Specification
Appearance	Fine, white, bulky powder
Identification (IR)	Conforms
Assay (as MgO)	6.8% - 8.3%
Loss on Drying	≤ 6.0%
Heavy Metals (as Pb)	≤ 10 ppm
Arsenic (As)	≤ 3 ppm
Lead (Pb)	≤ 2 ppm
Cadmium (Cd)	≤ 1 ppm
Mercury (Hg)	≤ 1 ppm
Acid Value	Contact for details
Microbial Limits	Meets USP/EP requirements

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.