Bonded high-alumina 96%


This premium high-alumina bonded solution is made of fused cast alumina grains.
Its high corrosion resistance provides excellent glass contact properties and thermal shock resistance. 
Available in complex and large shapes

Chemical and Physical Properties


microstructure alklear

Typical chemical composition


Typical crystallographic analysis 

Main phase : corundum 

Physical characteristics 

Description International standards British standards

Refractoriness under load of 2 105 Pa, at 0.5%

1,550°C 2822°F
Cold crushing strength 50 Mpa 7252 psi
Thermal conductivity at 1,000°C 3,3 W.m-1.K-1 22,8 BTU in hr-1.ft-2.F-1
Linear thermal expansion  8,1 10-6K-1 4,5 10-6F-1
Apparent Porosity 11,5% 11,5%
Typical bulk density 3,0g/cm3 187pcf

Expansion curve

0 0,2 0,4 0,6 0,8 1 1,2 0 200 400 600 800 1000 1200 ) % ( n o i s n a p x e r a e n i L Temperature ( ° C)
expansion curve ALKLEAR

Typical application

Alklear, our premium high-alumina bonded solution is mainly dedicated to forehearth glass contact channel blocks. Its excellent behaviour in contact with sodalime glass drastically reduces risk of glass defect.
The outstanding thermal shock resistance and ability to accomodate fast heat up makes it the prefered option for installation in hot condition.