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Why does zircon brick have dense structure?
Zircon brick is acid refractory whose main composition is ZrO2, generally the contents is above 64%, and the superior zircon sand is imported from Australia which has excellent quality, at the same time, SiO2 and Fe2O3 are added to the material when producing zircon brick which can make its micro structure dense. Zircon brick is designed to using in specific environment where the zircon brick need to withstand high temperature and heavy pressure，meanwhile, zircon brick can still keep its own stability. In addition, the dense structure of zircon brick directly leads to its ability of strong resistance to glass liquid, good creep resistance and high refractoriness under load.

As to zircon brick, zircon brick can be divided into several types according to the content of ZrO2, such as ZS-64, ZS-65,HDZ-65,HDZ-68. Obviously, the higher the content of ZrO2, the better the stability, the higher the ability of bearing high temperature and the higher the resistance to glass liquid. Zircon brick with the excellent performance and features can mainly be used in glass contact portion of alkali free or low-alkali glass melting furnace, such as the superstructure of flame space and tank bottom of glass furnace. and it is also used in lining of other quality glass furnace and special glass furnace with high corrosion resistance, such as boron silicate glass, ceramic glass, low-alkali or other technical glass.

Below are the specific indexes of zircon brick:
Item ZS-64 ZS-65 HDZ-65 HDZ-68
ZrO2 （%） ≥64 ≥65 ≥65 ≥68
SiO2 （%） ≤34 ≤33 ≤33 ≤30
Fe2O3（%） ≤0.5 ≤0.5 ≤0.3 ≤0.3
Apparent Porosity （%） ≤20 ≤18 ≤1 ≤8
Bulk Density (g/cm3) ≥3.6 ≥3.65 ≥4.25 ≥4.15
Cold Crushing Strength （Mpa） ≥100 ≥100 ≥310 ≥200
0.2Mpa Refractoriness Under Load T0.6 ℃ ≥1630 ≥1650 ≥1680 ≥1680
Pyrometric Cone Equivalent S.C. SK 40 40 40 40
Reversible Thermal Expansion 1000℃ % 0.5 0.5 0.5 0.5

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