CAS 1309-48-4

Magnesium oxide

氧化镁

MgOMW 40.305 g/mol

From the buying desk

Light burned, dead burned and fused magnesia share the CAS number but are sold into very different markets at very different prices. Reactivity, MgO content and calcium are the key specification points. Not dangerous goods; classification for customs depends on the grade, so confirm it with your broker.

Import Card

Before you order magnesium oxide from China, see its register listing, the duty, anti dumping cases and a supplier check on one card, each with its source and date.

Card for the US Card for Australia

Identifiers

Synonyms
Magnesia, Periclase
Formula
MgO
Molecular weight
40.305 g/mol
SMILES
O=[Mg]
InChIKey
CPLXHLVBOLITMK-UHFFFAOYSA-N

US and Australian rules for Magnesium oxide

Read from the official lists by CAS 1309-48-4. Screening only: check the source before you ship, store or report.

California Prop 65

No entry

No entry for CAS 1309-48-4 in the OEHHA list dated July 31, 2026.

Open the tool · Official source

OSHA exposure limit

Listed

Table Z-1: Listed without a number in the table. The limit is in a footnote or a standard for this substance, so check the table.

Open the tool · Official source

Australian exposure standard

Listed

10 mg/m³ as an 8 hour average.

Open the tool · Official source

CERCLA reportable quantity

No entry

No entry for CAS 1309-48-4 in 40 CFR 302.4 as read on September 24, 2026.

Open the tool · Official source

EPCRA Tier II threshold

No entry

Not on the Extremely Hazardous Substances list, so the general 10,000 lb Tier II threshold applies where an SDS is required.

Open the tool · Official source

Common applications

  • · Refractories
  • · Animal feed
  • · Rubber and plastics filler
  • · Water treatment and pH control

Sourcing documentation chain

Every shipment of Magnesium oxide from China should include a per-batch COA, a current SDS per GB/T 17519 on the China side and the destination jurisdiction's standard on the import side, a packing list, a bill of lading, and a certificate of origin. For Incoterms reference see FOB, CIF, and CFR.

Sourcing Magnesium oxide?

Tell us the chemical, grade and quantity. A person on our team in Shanghai sends you a real, checked factory, and your first one is free.

Get your free Factory Match Or talk to our team

Read next

Where this substance shows up across Sourzi

Referenced in

5 pages across the Sourzi moat

This term shows up in 5 regulatory pages. Sample backlinks per content type below.

Regulatory (5)

Plus 2 more regulatory pages.

Free download

Free PDF: the MSDS verification template Sourzi runs against the supplier sheet for every CAS number we book out of China.