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Fused silica for investment casting

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Price(USD)：USD550/MT
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what is Fused silica sand:

During the melting process of quartz sand above temperatures of 1700 °C, fused fused silica develops which contains SiO2 a amorphous modification once it is solidified.

The low extenion value is an advantage (< 0.1 percent, see Sand expansion). Thanks to this favorable behavior, fused-silica sand can be used as basic molding material for reducing sand expansion defects. It has to be take into consideration that already at temperatures of 1300 °C a slight sintering (see Sintering) sets in. This is the reason why it is used nearly exclusively in the area of light-metal foundry.

Fused silica 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
		Grade A Plus
2.1	SiO2	>99.9%
2.2	Al2O3	<100ppm
	The finer the power,the higher the Al2O3,as powder is produced by ball mill with Alumina ball.
2.3	Fe2O3	<30ppm for grains <60ppm 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