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α-β block is a dense, fused cast refractory containing approximately 38-48% alpha alumina and 48-58% beta alumina crystals. The intergrowth of crystalline phases and low interstitial glass boundary phase increase the structural stability of Alpha-Beta under load at high temperature.

Typical Chemical Composition:

Al₂O₃………………………………94%

SiO₂………………………………1.3%

Na₂O………………………………3.7%

Other………………………………< 1%

Physical characteristic:

Bulk density Ib/ft³(g/cm³)……………………………………………209(3.35)

(excluding shrinkage cavity)

Apparent porosity %………………………………………………………… <2

Linear change under load %…………………………………………………  0

Cold crushing strength psi(kg/cm²)³………………………… 28400（2000）

Modulus of Rupture

Cold psi (kg/cm²)³………………………………………………3800 (270)

Hot psi (kg/cm²)⁴…………………………………………………3270 (65)

Refractoriness under load of 0.2Mpa……………………………………1700℃

Typical Applications:

Glass furnaces

Paving

Superstructures

Refiner Sidewalls

Channels

Crowns

Available Casting Techniques:

Normal casting