Molekula
Magnesium oxide light EP/USP Grade
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 oxide light EP/USP Grade is a high-purity, fine white powder primarily used as an antacid, dietary supplement, and in pharmaceutical formulations to neutralize stomach acid. It also serves as a food additive (E530), stabilizer in plastics, and refractory material in industrial applications. Documented industrial uses include animal feed and fertilizer formulations, rubber compounding as an accelerator, oxychloride and oxysulfate cements, wallboard and insulation, and boiler scale control. This grade meets the European Pharmacopoeia (EP) and United States Pharmacopeia (USP) standards for purity and quality. CAS 1309-48-4, molecular formula MgO, molecular weight 40.305 g/mol, and stable at ambient storage conditions with no signal word required. Molekula supplies Magnesium oxide light EP/USP Grade 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
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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 | Free-flowing, white powder |
| Total plate count | ≤1000 cfu/g |
| Salmonella | Negative |
| Loss on Ignition | ≤5.0% |
| Chloride (Cl-) | ≤0.15% |
| Solubility | insoluble in water and alcohol, soluble in diluted mineral acids with effervescence |
| Free Alkali | (as 0.1 N H2SO4/g): ≤2.0 ml |
| Particle Size | (< 45 µm) (wet sieve): ~97.0% |
| Bulk density | ≤0.15 g/ml |
| Appearance of Solution | Not more coloured than B2 |
| Insoluble Substance | in acetic acid: ≤0.1% |
| Iron (Fe) | ≤0.05% |
| Lead (Pb) | ≤2 ppm |
| Arsenic (As) | ≤3 ppm |
| Calcium (Ca) | ≤1.1% |
| Magnesium (Mg) | Identification: Positive |
| E. Coli | Negative |
| Sulphates (SO4)(2-) | ≤1.0% |
| Mould & Yeast | ≤100 cfu/g |
| Assay (MgO) | 98.0 - 100.5 % |
| Alkali content | Identification: Positive |
| Enterobacteriaceae | Negative |
| Soluble Salts | ≤2.0% |
| Calcium Oxide (CaO) | ≤1.5% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White, very fine powder |
| Odour | Odorless |
| Melting Point | 2825 °C |
| Boiling Point | 3600 °C |
| Density | 3.6 (relative, water = 1) |
| Water Solubility | 86 mg/L at 30 °C |
| Solubility (other solvents) | Soluble in acids and ammonium salt solutions |
| Vapour Pressure | 0 mmHg (approx) |
| Refractive Index | 1.7355 |
Source: PubChem CID 14792 (HSDB, ICSC, The National Institute for Occupational Safety and Health (NIOSH))
Identification
| Property | Value |
|---|---|
| SKU | 90033718 |
| CAS Number | 1309-48-4 |
| IUPAC Name | oxomagnesium |
| EC Number | 215-171-9 |
| Molecular Formula | MgO |
| Molecular Weight | 40.305 |
| Exact Mass | 39.98 |
| SMILES | O=[Mg] |
| InChIKey | CPLXHLVBOLITMK-UHFFFAOYSA-N |
| InChI | InChI=1S/Mg.O |
| PubChem CID | 14792 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 2519.90.5000 |
| Tariff Code | 2519901090 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
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
- Animag
- Anscor P
- Calcined magnesia
- Granmag
- Heavy magnesium oxide
- Magcal
- Magnesia
- Magnesium oxide (MgO)
- Marmag
- Seawater magnesia
Frequently asked questions
What is magnesium oxide (light EP/USP grade) commonly used for?
This grade is primarily used in pharmaceuticals, food supplements (as an antacid or mineral supplement), and as a mild laxative in medicinal formulations.
What is the chemical formula and molecular weight of magnesium oxide?
The chemical formula is **MgO**, and the molecular weight is **40.305 g/mol**.
How should magnesium oxide (light EP/USP) be stored?
Store in a cool, dry place at ambient temperature, away from moisture and contaminants, in a tightly sealed container.
What grades of magnesium oxide does Molekula supply, and is this USP/EP compliant?
Molekula supplies **light magnesium oxide in USP/EP grade**, meeting strict pharmaceutical and food-grade standards for purity and quality.
Can Molekula supply magnesium oxide in bulk quantities?
Yes, we offer bulk quantities of magnesium oxide (light EP/USP) in various packaging options, including drums and bags, tailored to your needs.
What documentation is provided with a magnesium oxide order?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and **batch-specific documentation** confirming USP/EP compliance.
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.