Magnesium / Aluminum Alloy (Magnalium)

Magnesium/Aluminum Alloy, commonly known as Magnalium (MgAl), is a brittle, silver-gray metal powder used in pyrotechnics as a high-temperature fuel. Typically produced in a 50:50 ratio, it generates intense white light, sparks, and crackling effects, offering greater stability than pure magnesium while remaining more reactive than aluminum.

Key Details:

Chemical Formula: MgAl (Al–Mg alloy, often containing intermetallic phases such as Al₁₂Mg₁₇)

CAS Numbers: 1318-33-8 or 12604-68-1

Appearance: Silver-gray metallic powder

Description: A highly reactive metal fuel that is more sensitive than aluminum but safer and more stable than pure magnesium. Its brittle nature allows it to be easily milled into fine powders.

Typical Particle Sizes: Finer than 120 mesh for spark effects, and 30–50 mesh for crackling compositions.

Primary Uses in Pyrotechnics:

• Spark Effects & Stars: Produces intense, dazzling white light and bright metallic sparks.
• Strobing Compositions: Essential for creating delayed or pulsing “strobe” star effects.
• Crackling Stars & Microstars: Used to generate audible crackling effects in aerial and ground displays.
• Flash Powders & Flares: Serves as a substitute for aluminum to increase burn speed and combustion temperature.

Hazards: Magnalium is spontaneously combustible under certain conditions, reacts dangerously when wet, and is susceptible to oxidation. Proper handling and storage are essential.

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