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Magnesium stearate

CAS Number
557-04-0
EC Number
N/A
Chemical Formula
C18H36O2.1/2Mg
Molecular Weight
591.2 g/mol

Description

Magnesium stearate (CAS 557-04-0 ), also designated E470B in food and feed applications, is a magnesium salt of stearic acid used across pharmaceutical, food, and industrial manufacturing. Its primary commercial function is lubrication, reducing friction between particles and contact surfaces during processing and compaction. In pharmaceutical tablet and capsule manufacturing, it prevents powder blends from sticking to punches and dies. This enables consistent high-speed compression runs. Food and nutraceutical producers use it as an anti-caking and flow agent in powdered blends, seasonings, and dietary supplement capsules. In plastics processing, it acts as a release agent and stabilizer, helping PVC and other polymer compounds release cleanly from molds while improving heat stability during the manufacturing process. Personal care formulators incorporate it into pressed powders and cosmetic compacts to improve slip, binding, and texture uniformity. Magnesium stearate is supplied as a fine white powder in varying particle size distributions. These distributions are suited to different processing requirements. Established grades include pharmaceutical ( USP /NF, Ph. Eur. , BP ), food-grade ( FCC ), and technical grade for industrial applications. Packaging typically ranges from multi-layer bags to bulk containers, with vegetable-source and animal-source variants available to meet specific formulation and labeling requirements for global distribution. Contact us for supply of Magnesium stearate Request Quote

Other Names (Synonyms)

stearic acid, magnesium salt | octadecanoic acid, magnesium salt | dibasic magnesium stearate | Magnesium octadecanoate | magnesium distearate | Synpro 90 | Petrac MG 20NF | Magnesium stearate g | E470B

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point88 °C
Density1.028 g/cm³
Appearancewhite powder
ColorWhite
Odorwh. soft oily powd., tasteless, odorless
FormFine Powder
Water SolubilityInsoluble
pH7 (H2O) (slurry)
Log P8.216 (est)

Safety & Handling

Warning
GHS07· Irritant

Hazard Statements

H315Causes skin irritation
H316Causes mild skin irritation
H319Causes serious eye irritation
H320Causes eye irritation
H335May cause respiratory irritation
H413May cause long lasting harmful effects to aquatic life

Precautionary Statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P264Wash … thoroughly after handling.
P271Use only outdoors or in a well-ventilated area.
P273Avoid release to the environment.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P319Get medical advice/attention if you feel unwell.
P321Specific treatment (see … on this label).
P405Store locked up.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P317Get emergency medical help.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P364Take off contaminated clothing and wash it before reuse.
P233Store in a well-ventilated place. Keep container tightly closed.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code29157030
Storage Class11 - Combustible Solids