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Fused silica powder

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Price(USD)：USD550/MT
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Chemsize fused silica is an high purity amorphous silicon doxide which is made by electrically fused high purity acid wasted silica. Fused silica has a low thermal conductivity and excellent thermal shock resistance. These properties, along with its low density, make it an excellent refractory for use in a ceramic shell mold. Chemsize fused silica is available in flour and granular forms.

Chemsize fused silica can be used throughout the ceramic shell. Shells constructed with fused silica hold their dimensions better and are not prone to hot deformation or bulging. Shell knockout is also easier with fused silica refractories.

Primcoat Binder is mixed with either -120mesh or 200mesh and used in conjunction with 50-100 or 30-50mesh to build ceramic shells for Lost Wax Casting.

This is the video on Youtube about Ceramic shell slurry & first fused silica coat.Dipping a wax on a ceramic shell slurry drum, until its completely wet, then letting it drip excess slurry, to ad the first coat of fused silica

Fused silica for investment casting spec:

1.	Physical Properties
1.1	Composition		SiO2
1.2	Structure		Amorphous
1.3	Colour		Transparent or white
1.4	Melting Temperature		approx.1750ºC
1.5	Specific Gravity		2.21g/cm3
1.6	Hardness		7 Mohs
1.7	Thermal Expansion		0.5*10-6
2.	Chemical Properties
		Fused silica investment casting Grade
2.1	SiO2	>99.85%
2.2	Al2O3	<150ppm
	The finer the power,the higher the Al2O3,as powder is produced by ball mill with Alumina ball.
2.3	Fe2O3	<60ppm for grains <100ppm for powder
2.4	CaO	<15ppm
2.5	Na2O	<15ppm
2.6	K2O	<15ppm

3. Particle Size Distribution

		Standard
		10-20	30-50	50-100	-120	-200	-325
Mesh	Microns
+8	2360	<2
+12	1700	6-25
+16	1180	33-50
+20	850	25-45	<1
+30	600	13	25-40
+40	425		32-45
+50	300		15-30	<13
+70	212			30-60
+80	180		0-11			<1
+100	150			28-51	<10	<1
+140	106			4-16	7-13	<10
+200	75			<2	10-15	<10	<3
+325	45				14-20	15-30	4-11
Pan		<3	<2	<1	45-55	70-80	86-97