CAS 557-04-0
Magnesium Stearate
Magnesium Stearate is the most common tablet and capsule lubricant, preventing sticking to punches and dies, supplied to Ph. Eur./USP-NF from vegetable sources.
Magnesium stearate is the magnesium salt of stearic and palmitic acids. Added at around 0.25–2% to a tablet blend, it coats particles and machine surfaces so tablets eject cleanly and powders flow evenly into dies and capsules.
It is very effective, but more is not better. Because it is hydrophobic, too much or too long a blending time coats particles in a water-repellent film, which softens tablets and slows dissolution. Blending is normally limited to a few minutes at the end of the process. Vegetable-source grades meet Halal, Kosher and vegetarian requirements.
- CAS number
- 557-04-0
- Grades / forms
- Lubricant grade
- Industries
- Pharma
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- MSDS in destination format
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Typical applications
- Tablet lubricant
- Capsule filling flow aid
- Nutraceutical and supplement tablets
- Pressed powders in cosmetics
Packing options
- 20 kg multi-wall paper bags with PE liner
- Fibre drums
Storage & handling
Store in closed containers in a cool, dry place.
Documentation
Certificate of Analysis, MSDS, Certificate of Origin, dangerous goods declaration where applicable, and third-party pre-shipment inspection on request.
Typical specification
- Standard
- Ph. Eur. / USP-NF
- Magnesium content
- 4.0–5.0%
- Loss on drying
- ≤ 6.0%
- Stearic acid in fatty acid fraction
- ≥ 40%; stearic + palmitic ≥ 90%
- Source
- Vegetable
Typical values for reference. The exact specification is agreed before the order and confirmed on the Certificate of Analysis for each batch.
Magnesium Stearate — frequently asked
Magnesium stearate is typically used at 0.25–2% of the tablet weight, most often around 0.5–1%. The lowest effective level is preferred because excess slows dissolution and softens tablets.
Over-blending spreads a hydrophobic film of magnesium stearate over the particles, reducing tablet hardness and slowing disintegration and dissolution. It is usually blended for only two to five minutes at the end.
Yes. Magnesium stearate is supplied from vegetable fatty acids, suitable for vegetarian, Halal and Kosher products. Supporting documentation is provided on request.
Yes. Chemtrade manufactures and exports Magnesium Stearate (CAS 557-04-0) from Surat, Gujarat, India to more than 55 countries, for customers in Pharma. Send your grade, quantity and destination port for a quotation within one business day.
Every shipment of Magnesium Stearate from Chemtrade includes a batch-specific Certificate of Analysis (COA) and Material Safety Data Sheet (MSDS). Certificate of Origin, third-party pre-shipment inspection and destination-specific regulatory documentation are arranged on request.
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