BENZOPHENONE HYDRAZONE

Brown Fused Alumina

Brown Fused Alumina is made from high- quality bauxite by fusing in a pouring electric arc furnace at a high temperature above 2000C. Crushed and dressed, followed by magnetic separating and screening, the crystallized ingot becomes grains of dense structure, great hardness, good self- sharpening and excellent grinding properties.

Chemical Analysis

Symbol		Range of Grit sizes	Chemical Composition %
Symbol		Range of Grit sizes	Al2O3	>=TiO2
A	F	4# - 80# 90# - 150# 180# - 220# 220# - 1200#	95.0-97.5 94.0-97.5 93.0-97.5 >=92.0	1.5-3.8
	P	P8 - P80 P100 - P150 P180 - P220	95.0-97.5 94.0-97.5 93.0-97.5	1.5-4.2
	R	8 - 5mm, 5 - 3mm 3 - 1mm, 1mmF 0.088mmF 0.074mmF	95.0 90.0 88.0	3.0 5.0
AA	F	4# - 80# 90# - 220# 220# -	93.0 91.0 90.0	1.5-4.2 1.5-4.2 4.5
	P	P8 - P80 P100 - P220 P220 -	93.0 91.0 90.0	1.5-4.2 1.5-4.2 4.5

Physical Properties
Crystal forom Chemical nature Reaction with acids Reaction with alklies Oxidation-reduction effects True density Hardness ¡¡Knoop ¡¡Moh's Colour Colour after firing Melting point Max. usable temperature Specific heat (Cal/g. C) Coefficient of thermal conductivity Index of refraction Electrical resistivity Coefficient of linear expansion(x10-6 C-1)	Alpha alumina trigonal system Amphoteric Subject to mild attack by aqua and/or hydrofluoric acid. Very slight with strong hot solutions only. None 3.90 g/cm³ 2000 - 2200 Kg/mm² 9.0 Dark brown Light blue 2000 C 1900 C 0.26 (20 - 90 C) (Room temperature) 900 C 0.047 0.013 (Cal/cm³. sec. C) e=1.760 w=1.768(Na line) 30 C 300 C 900 C 1600 C(cm) 10 16 10 13 10 5 10 4 7 - 9 (0 - 1600 C)

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