Stonebase Refractory can provide its global customers with high quality refractory and ceramics raw material, these raw material include Calcined Kaolin, Calcined Bauxite, Mullite, Cordierite, Brown Fused Alumina, White Fused Alumina, Tabular Alumina, Spinel，SiC，Flake Graphite, etc. the following is their specification.
Calcined Bauxite Calcined Bauxite Brown Fused Alumina Flake Graphite
Cordierite Black SiC Tabular Alumina White Fused Alumina

Calcined Kaolin: Calcined Kaolin is an anhydrous aluminium silicate produced by heating ultrafine natural kaolin to high temperatures in a kiln. The calcination process increases whiteness and hardness, improves electrical properties, and alters the size and shape of the kaolin particles.
Type CK40 CK42 CK45
Al2 O3  (min) 40 42 45
Fe2 O3  (Max) 0.6 0.5 0.5
B. D g/cm3 2.40 2.45 2.45

Calcined Bauxite: Chinese bauxite has higher Al2 O3  and low impurities. Selected bauxite was calcined in shaft, round, rotary kiln at high temp., the Al2 O3  transfers to alpha Al2 O3  and form corundum phase, further crushed, grinded and sieved to obtain an ideal aggregate for refractory application.
Type Rotary Kiln Bauxite Round Kiln Bauxite Shaft Kiln Bauxite
Chemical Properties Al2 O3 85-88      90      85-89      90      80-86
Fe2 O3 2 1.5 2 1.5 2
Physical Properties B.D g/cm3 3.15-3.25 3.4 3.15-3.3 3.4 2.8-3.1

Mullite (2SiO2  3Al2 O3 ): Its structure gives it an excellent "creep" resistance and high temperature resistance. Mullite widely used in producing of kiln furniture, investment casting, refractory bricks and other shaped refractory.
Type Chemical Composition % Bulk Density
g/cm3 		Apparent
Porosity %		 C.T.E20-1200℃
10-6     K-1		 Phase Composition %
Al2 O3 SiO2 Mullite Glass
Mullite 47 48-52 49-45 ≥2.50 <4.0 4.4 65 30
Mullite 60 60-75 37-32 ≥2.65 <3.0 - 80 Trace
Mullite 70 70-73 26-23 ≥2.80 <3.0 - 90 Trace

Cordierite (5SiO2  2Al2 O3  2MgO): Its low thermal expansion gives it an excellent thermal shock resistence. Cordierite widely used in Producing kiln furniture, honeycomb ceramics, and so on.
Raw Material Chemical Composition Bulk Density
g/cm3		 Apparent
Porosity %		 Thermal Expansion
Coefficiency (%)		  Phase Composition
Cordierite %
SiO2 Al2 O3 MgO
Synthetic Cordierite 49-51 34-37 13-15 ≥1.9 <25 1.8 ≥95

BFA, WFA, Tabular Alumina: They are very important raw material for advanced refractory and abrasives. Theirs properties are as following.

Brown Fused Alumina
95 Brown Fused Alumina
Chemical Composition True Density Mo's Hardness Micro Hardness
Al2 O3 ≥95% >3.80g/cm3 9.0 2000-2200kg/mm2
SiO2 ≤1.5%
TiO2 ≤3.3%
Fe2 O3 ≤0.4%

Tabular Alumina
Items Guarantee Value% Typical Value%
Chemical
Composition		 Al2 O3 ≥99.20 99.36
SiO2 ≤0.2 0.15
Fe2 O3 ≤0..1 0.02
Na2 O ≤0.4 0.38
Physical
Character		 Bulk Density g/cm3 ≥3.5 3.53
Apparent Porosity % ≤5.0 3.00
Water absorption % ≤1.0 0

White Fused Alumina
Chemical Composition(%) Guarantee Value Typical Value Main-Phase Bulk Density g/cm3
Al2 O3 ≥99 99.25 α- Al2 O3 ≥3.45 g/cm3
SiO2 ≤0.4 0.09
Fe2 O3 ≤0.1 0.09
Na2 O+K2 O ≤0.45 0.27

Silicon Carbide (SiC): the high thermal conductivity of the SiC gives product a good thermal shock resistance, Silicon carbide widely used in produce SiC kiln furniture, SiC bricks, castable and monolithics.
Type Reference Chemical Composition
SiC≥ F.C< T. Fe
SRC88 85.00 5.00 2.00
SRC95 95.00 1.00 0.70
SRC97 97.00 0.50 0.50

Flake Graphite: Flake graphite is a naturally occurring form of graphite that is typically found as discrete flakes ranging in size from 50-800 micrometers in diameter and 1-150 micrometers thick. This form of graphite has a high degree of crystallize, which equates to near theoretical true density, high thermal and electric conductivity, and low spring back (excellent molding characteristics).
Type Brand Specification
Fixed Carbon≥% Ash≤% Moisture≤%
High Carbon Graphite HC99-HC94 99-94 1.0-6.0 0.5
Medium Carbon Graphite MC93-MC80 93-80 7.0-20.0 1.0
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