MULLITE manufacturers and suppliers

MULLITE suppliers

Properties

Melting point:: 1750℃ [JAN85]

Density: 3.16 g/cm³

solubility: insoluble in H2O, acid solutions, HF

form: powder

color: White

Water Solubility: Insoluble in water.

Exposure limits: ACGIH: TWA 1 mg/m3
OSHA: TWA 15 mg/m3; TWA 5 mg/m3

Safety Information

Symbol(GHS): GHS08

Signal word: Warning

Hazard statements: H373

Precautionary statements: P260-P314-P501

Safety Statements: 22-24/25

WGK Germany: 3

RTECS: BD1450000

TSCA: Yes

Use

Artificial mullite, or synthetic mullite, a ceramic material made by a prolonged fusing in the electric furnace of a mixture of silica sand or diasphoric clay and bauxite, has the composition 3Al2O3·2SiO2, has a melting point of 1810 C, and softens at 1650 C. Mullite occurs in nearly all ceramic products containing alumina and silica but, with the exception of refractories, is seldom introduced as such except as calcined kyanite. The bricks are resistant to flame and to molten ash, and have a low, uniform coefficient of thermal expansion and a heat conductivity only slightly above that of fireclays. Normally, mullite has very fine crystals that change form and become enlarged after prolonged heating, making the product porous and permeable. For stable high-temperature refractories the mullite is prefused to produce larger crystals. At very high temperatures mullite tends to decompose to form corundum and alkali-silicate minerals of lower heat resistance. Mullite is also used for making spark plugs, chemical crucibles, and extruding dies, and a foamed mullite is used as a uniformly latticed honeycomb structure for lightweight, heat-resistant structural parts.

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