Magnesium Stearate
CAS Number: 557-04-0
Chemical Formula: C36H70MgO4
Synonyms: stearatedemagnesium，MAGNESIUM STEARATE，MAGNESIUM OCTADECANOATE
Appearance: White Powder
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Magnesium stearate has long been widely used in the food industry as an emulsifier, binder, thickener, anticaking agent, lubricant, release agent, and antifoaming agent. It is widely found in food supplements, confectionery, chewing gum, herbs, spices, and baking raw materials. It also serves as a common inactive excipient in pharmaceutical tablets, capsules, and powder production. Its excellent lubrication comes from its hydrophobicity, which reduces friction between tablets and die walls during ejection.
Chemical Properties
| Item | Value |
| Melting point | 200 °C lit. |
| density | 1.028g/cm3 |
| storage temp. | Inert atmosphere Room Temperature |
| solubility | alcohol insoluble |
| form | Fine Powder |
| color | White |
| Odor | white soft oily powder tasteless odorless |
| PH | 7 H2O slurry |
| Water Solubility | Insoluble |
| Merck | 14,5690 |
| BRN | 3919702 |
| Exposure limits | ACGIH TWA 10 mg/m3 TWA 3 mg/m3 |
| Stability | Stable Incompatible with strong oxidizing agents |
| Cosmetics Ingredients Functions | MOISTURISING ANTICAKING BULKING COLORANT |
| InChIKey | DRJIJXNWSSRTTE-UHFFFAOYSA-M |
| LogP | 8.216 est |
| CAS DataBase Reference | 557-04-0 CAS DataBase Reference |
| EPA Substance Registry System | Magnesium stearate 557-04-0 |
Safety Information
| Item | Value |
| Hazard Codes | Xi |
| Risk Statements | 36/37/38 |
| Safety Statements | 26-37/39 |
| WGK Germany | – |
| RTECS | WI4390000 |
| TSCA | Yes |
| HS Code | 29157030 |
| Hazardous Substances Data | 557-04-0 Hazardous Substances Data |
| Toxicity | LD50 orally in Rabbit > 2000 mg/kg |
Product Application
Magnesium stearate is frequently used as an anti-adherent in pharmaceutical tablets, capsules, and powders. Its lubricating effect prevents materials from sticking to equipment during tableting, making it the most widely used tablet lubricant. Research indicates it may influence active ingredient release but does not lower overall bioavailability. As a food additive and pharmaceutical excipient, it is coded E470b. It also binds sugar in hard candies such as mints and is used in infant formula. Pure powdered magnesium stearate presents a dust explosion risk, though this risk is negligible outside manufacturing facilities.
Supply & Delivery
Fast delivery time
Inventory: 2-3 working days
New production: 7-10 working days
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