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| Name︰ | Quartz glass ceramics |
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| specifications︰ | Sizes and outside index 规格尺寸及外观指标(YB4076-91)： mm
Item 项 目 Index 指 标
Size tolerance尺寸允许偏差 Size尺寸≤100 ±1．0
Size尺寸101200 ±2．0
Size尺寸>200 ±1．5％
Wall thickness relative tolerance
壁厚相对偏差
No more than
不大于
2．5
Warpage(at altitude)扭曲(高度方向) 0．5％
Short edges depth
缺棱、深度 work surface
工作面 3
No work surface
非工作面 5
Surface pore and exposed slurry，depth
表面气孔与缺浆，深度 2
Crack，fluxing hole，Slage attack
裂纹、熔洞、渣蚀 Not be allowed
不准有
Note：work surface is the face in contact with morlten steel Or other objects
注：工作面指与钢水或其他物料的接触面。
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| Advantages︰ | Quartz glass ceramics is a new type high purity and high temperature proof quartz glass material， the strong point is： low thermal conductivity， small expansion coefficient high temperature proof， excellent thermostability and cost lower than other quartz glass．It has been widely used as long nozzle and immersion nozzle brick for the continiously flood steel，flood gate brick and flood channel for the float glass production，material bowl and material tube for the ware glass kiln， crucible for smelting the special glass，quartz glass ceramics rollers for the horizontal glass toughened furnace oxygen furnace brick for aluminium production in the fields of metallurgy，chemical industry，building material，national defence and science reaserch．
Our company is the first enterprise to produce quartz glass ceramics，hasworked for more than 30 years．We have the largest scale production line and the measure test instruments， meeting the riquierments of variety，small and outsize products．
Physical and Chemical properties：
SiO2(%) >99．5 Bulk density(g／m3) >1．82
Apparent porosity(％) <18 Compression strength at normal
temperature(Mpa) >40
Transverse strength(Mpa) >21 Apparent initing soffening temperature
Refractorfhess(℃) 1730 (0．2Mpa，t0) 1150
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