Magnesium

Mg

magnesium

CAS7439-95-4
GHS02 Gefahrensymbol: Entzündbar – Flamme
Danger

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Identification

CAS Number
7439-95-4
EC Number
231-104-6
UN Number
1418
Index Number
012-002-00-9
PubChem CID
5462224

Physical-chemical properties

Molecular Formula
Mg
Molar Mass
24.30 g/mol
IUPAC Name
magnesium

Chemical Identifiers

InChI
InChI=1S/Mg
InChI Key
FYYHWMGAXLPEAU-UHFFFAOYSA-N

Overview

Magnesium (CAS 7439-95-4) is a lightweight alkaline earth metal with high reactivity and excellent structural properties. This silvery-white metallic element serves as a fundamental material in numerous industrial applications, from aerospace manufacturing to chemical processing. As the eighth most abundant element in the Earth's crust, magnesium exhibits remarkable characteristics that make it highly valuable in technical applications. With a density of only 1.74 g/cm³, it is approximately one-third lighter than aluminum while maintaining excellent strength-to-weight ratios. The metal's atomic structure, featuring two valence electrons, contributes to its strong reducing properties and its tendency to form stable ionic compounds. From a safety perspective, magnesium requires careful handling due to its flammable solid classification (Flam. Sol. 1) and water-reactive properties (Water-react. 2). The metal can ignite when exposed to moisture or high temperatures, burning with an intense white flame that reaches temperatures exceeding 3,000°C. Proper storage in dry, inert atmospheres and adherence to ADR Class 4.3 transportation regulations are essential for safe handling. Industrial applications for magnesium span multiple sectors, including aerospace component manufacturing where its lightweight properties are crucial for fuel efficiency. The automotive industry utilizes magnesium alloys for engine blocks, transmission cases, and structural components. Additionally, magnesium serves as a critical reducing agent in metallurgical processes, particularly in the production of titanium and other specialty metals. Like other phosphide compounds such as trimagnesium bis(phosphorus(3-)) and trizinc bis(phosphorus(3-)), magnesium-based materials play important roles in advanced material synthesis. OYSI maintains reliable supplies of technical-grade magnesium to support diverse European industrial requirements, ensuring consistent quality and regulatory compliance for demanding applications.

Safety & Classification

Danger
Classification:

Flam. Sol. 1; Self-heat. 1; Water-react. 2

HHazard Statements (H-Statements)

Describe the nature and severity of the hazard

H228

Flammable solid.

H261

In contact with water releases flammable gases.

Classification according to CLP Regulation (EC) No 1272/2008. The complete list of hazard and precautionary statements can be found in the Safety Data Sheet (SDS).

First Aid Measures

Transport (ADR)

UN Number1418
ADR Class4.3
Packing GroupII
Tunnel CodeD/E
Proper Shipping NameMagnesium-Pulver, leicht mit Wasser reagierend
Marine PollutantNo

Frequently Asked Questions

What is magnesium?

Magnesium is a lightweight alkaline earth metal with the chemical formula Mg and CAS number 7439-95-4. It appears as a silvery-white metallic element with a molecular weight of 24.305 g/mol. Magnesium is highly reactive and classified as a flammable solid that can self-heat and react with water, making it a dangerous substance requiring careful handling and storage protocols.

What are the physicochemical properties of magnesium?

Magnesium is a solid silvery-white metal at room temperature with a distinctive metallic luster. It has a relatively low density compared to other metals and is highly reactive with water and oxygen. The metal can ignite easily and burns with a bright white flame, producing magnesium oxide. It readily reacts with acids and can generate hydrogen gas when in contact with water or moisture.

What is magnesium used for?

Magnesium is widely used in metallurgical applications as an alloying agent to improve the strength and corrosion resistance of aluminum and other metals. It serves as a reducing agent in chemical processes, particularly in the production of titanium and other metals. Additionally, magnesium is utilized in pyrotechnics, flares, and incendiary devices due to its bright burning characteristics, and in the aerospace industry for lightweight structural components.

How to handle magnesium safely?

Magnesium requires careful handling using appropriate personal protective equipment including safety goggles, protective gloves, and flame-resistant clothing. Work in well-ventilated areas away from ignition sources, water, and incompatible materials. Use non-sparking tools and avoid generating dust or fine particles. Keep fire extinguishing media suitable for metal fires (Class D) readily available, as water and standard extinguishers can worsen magnesium fires.

How to store magnesium correctly?

Magnesium must be stored in a cool, dry place away from heat sources, ignition sources, and moisture. Keep containers tightly sealed and store separately from oxidizing agents, acids, and water-containing substances. Use appropriate storage areas with adequate ventilation and fire protection systems designed for flammable solids. Ensure storage areas are equipped with Class D fire extinguishing agents specifically designed for metal fires.

What to do in case of contact with magnesium?

Magnesium exposure requires immediate action depending on the contact type. For skin contact, brush off any particles gently and wash with plenty of water. In case of eye contact, flush immediately with clean water for at least 15 minutes and seek medical attention. If inhaled, move to fresh air immediately. Never use water on magnesium fires; instead, use Class D fire extinguishers or dry sand to smother flames.

How to dispose of magnesium appropriately?

Magnesium disposal must comply with local and national waste regulations as it is classified as hazardous waste. Contact authorized waste disposal companies experienced in handling reactive metals. Small quantities should be carefully oxidized under controlled conditions by trained professionals. Never dispose of magnesium in regular waste streams or down drains, as it can react violently with water and create fire hazards in waste processing facilities.

How to transport magnesium?

Magnesium is classified under ADR Class 4.3 (substances which, in contact with water, emit flammable gases), Packing Group II. It requires proper dangerous goods packaging, labeling with GHS02 pictograms, and appropriate transport documentation. Vehicles must carry suitable fire extinguishing equipment and emergency response information. Transport should avoid routes through tunnels where restricted, and drivers require dangerous goods training certification.

Is magnesium subject to particular regulations?

Magnesium is regulated under various European frameworks including CLP Regulation for classification and labeling as Flam. Sol. 1, Self-heat. 1, and Water-react. 2 with the signal word 'Danger'. It falls under REACH registration requirements and ADR transport regulations. While not currently listed as an SVHC substance, it requires compliance with occupational safety standards and may be subject to specific national restrictions regarding storage and use quantities.

Where to buy magnesium in Europe?

Magnesium is available through OYSI, a European distributor of chemical products specializing in industrial chemicals. As an experienced chemical supplier, OYSI can provide magnesium with proper documentation, safety data sheets, and regulatory compliance support. Professional customers can contact OYSI for availability, specifications, and delivery options across European markets, ensuring proper handling and transport protocols are followed for this dangerous substance.

Data Sources

Classification per CLP Regulation (EC) No 1272/2008. Data from ECHA and PubChem.