Fused Cast Azs Refractories for Glass Furnaces

Fused Cast AZS are the most widely used materials in glass melting furnaces, frit kilns and occasionally some foundry plants(skid rails of reheating furnace). They can be classified by their zirconia content, which basically defines their corrosion resistance, into 3 families: AZS 33, AZS36 &AZS 41 (Equal to ER 1681, ER 1685, ER 1711 or Monofrax CS-3, CS-4, CS-5 in quality)

AZS 33: The compact microstructure of AZS 33 enables it to have very good corrosion resistance to molten glass. It very rearely results in stoning and has very limited chances to cause blistering and othe defects to glass, so AZS 33 is the most common product used in the glass furnace.

AZS 36: Despite of the similar eutectic crystal as AZS 33, AZS 36 has more free baddeleyite crystals in chain structure and less vitreous phase, which further improve the corrosion resistibility and reduce the potential defects in glass, so it is recommended to be used in sections where glass flow is faster and temperature is higher, such as melter sidewall, paving, doghouse, etc.

AZS 41: AZS 41 has the most free baddeleyite crystals among the fused cast AZS families, which are evenly distgributed within the block. Its corrosion resistibility is the best and thus it is usually recommended to be used in the most demanding positions to balance the furnace life.