Alubond – Stone’s formulated CORE exposed to a temperature over 332 Deg. C
Alubond–Stone ‘s choice of Magnesium Hydroxide as its prime core mineral is based on the following data.
Magnesium Hydroxide is much more reactive than Alumina Trihydrate (ATH), whereas ATH releases the available water over a broad range (230º C to 430º C), Magnesium Hydroxide releases the available water over a much narrower range (330º C or 630º F to 430º C). In simple terms this compares to spraying a fine mist of water over a fire (ATH) as opposed to dousing the fire with a full bucket of water (Magnesium Hydroxide). The quick release of water enhances the flame retardant properties of Magnesium Hydroxide.
Water Release :
Magnesium Hydroxide releases water at a higher temperature than ATH. The higher temperature release is at a more critical point that reduces the spread of the flame.
Particle Shape :
Magnesium Hydroxide particles, if viewed under a microscope, are plate-like versus the spherical particles of ATH. These plate-like particles overlap one another similar to fish scales or roofing shingles. Pound for pound these plate-like particles offer much more exposed surface area than spherical ATH particles. Therefore more particles are directly exposed to the flame. Also, the plate-like particles provide more strength, flexibility and reinforcement in the finished product as opposed to spherical particles.
Particle Integration :
Magnesium Hydroxide is a natural mix of particles. There is particle penetration and integration within Magnesium Hydroxide rather than having ATH and calcium carbonate particles mixed side by side. This allows a better distribution of the fire retardant and smoke suppressant properties.
Magnesium Hydroxide has stabilizing characteristics that tend to neutralize acid and toxic smoke. ATH does not provide these benefits.
Char Ash :
Magnesium Hydroxide during the burning reaction forms a “Char-Ash” in front of the flame, which suppresses the flame.