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Andalusite is one mineral of natural kynaite brick minerals.Its structure is dense and true density is one number between 3.10g/cm3 and 3.16 g/cm3.Its true dnestiy is basically similat to mullite′s.It gradually change to chimney mullite crystal of paralleling with original crystal in 1350℃,lesser volume effect and basically invariable bubble.So it can be main material of manufacture refractory products.Characteristic of andalusite brick is below as stable volume,better palling resistance,unti-creep,higher initial softening point under load,iron dreg better permeability and chemical stability and so on.And then it extensive is used to body of hot blast heater,torpdeocar liquid iron cover,glass kiln,electric furnace top,henting furnace.

AL2O3% Fe2O3% Refract-
Oriness
Apparent psnosity
% Bulk density
g/cm3 0.2MPa
the start refracto-
riness under load 1500℃×3h
Reheating lineat change MPa cold compr-
essive strength Mpa×50h% creep
Percen-
tage Heat shock stability
RH-150 ≥60 ≤1.0 >1790 ≤18 ≥2.45 ≥1680 +0.2～0 ≥50 1500℃
≤0.6 ≥20
RH-145 ≥56 ≤1.2 >1790 ≤18 ≥2.45 ≥1680 +0.2～0 ≥45 1450℃
≤0.8 ≥20
RH-140 ≥52 ≤1.3 >1790 ≤20 ≥2.45 ≥1680 +0.2～0 ≥40 1400℃
≤0.8 ≥20