Molekula
Magnesium stearate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Magnesium stearate is a metallic soap used as a lubricant in pharmaceutical and cosmetic manufacturing. It is a white, odorless powder that improves flow properties in tablet and powder formulations. CAS: 557-04-0, Molecular Formula: [CH3(CH2)16CO2]2Mg, Molecular Weight: 591.24 g/mol, Storage: Ambient, Signal Word: Warning. Molekula supplies Magnesium stearate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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100 g — £29.50 per pack ex VAT · £35.40 inc. VAT
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500 g — £77.70 per pack ex VAT · £93.24 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Light fine powder |
| Water | ≤4.0% |
| Mesh | (1500) ≥98.0% |
| Free acid | ≤4.0% |
| Assay(Mg) | 4.0 - 5.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Lumps |
| Odour | Odorless |
| Melting Point | 88 °C |
Source: PubChem CID 11177 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 17736814 |
| CAS Number | 557-04-0 |
| IUPAC Name | magnesium bis(octadecanoate) |
| EC Number | 209-150-3 |
| Molecular Formula | [CH3(CH2)16CO2]2Mg |
| Molecular Weight | 591.24 |
| Exact Mass | 590.5125 |
| SMILES | CCCCCCCCCCCCCCCCCC(=O)[O-].CCCCCCCCCCCCCCCCCC(=O)[O-].[Mg+2] |
| InChIKey | HQKMJHAJHXVSDF-UHFFFAOYSA-L |
| InChI | InChI=1S/2C18H36O2.Mg/c2*1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h2*2-17H2,1H3,(H,19,20);/q;;+2/p-2 |
| PubChem CID | 11177 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29157001 |
| Tariff Code | 2915705090 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+350 IF ON SKIN: Gently wash with soap and water
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Dibasic magnesium stearate
- Magnesii stearas
- Magnesium distearate
- Magnesium octadecanoate
- Magnesium stearate g
- Octadecanoic acid, magnesium salt
- Petrac MG 20NF
- Stearic acid, magnesium salt
- Synpro 90
- Synpro Magnesium Stearate 90
Frequently asked questions
What is magnesium stearate used for?
Magnesium stearate is commonly used as a lubricant in pharmaceutical manufacturing and as a release agent in industrial processes.
What is the chemical formula and molecular weight of magnesium stearate?
The formula is [CH3(CH2)16CO2]2Mg with a molecular weight of 591.24 g/mol.
How should magnesium stearate be stored?
Store at ambient temperature, protected from moisture and direct sunlight.
What grade of magnesium stearate does Molekula supply?
Molekula supplies pharmaceutical-grade magnesium stearate suitable for use in drug formulations.
Can Molekula supply magnesium stearate in bulk?
Yes, Molekula can supply magnesium stearate in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with a magnesium stearate order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.