Patent ID: 7074733

Claim:
Unshaped refractory composition, in particular for producing glass furnace hearths, which comprises a basic mixture comprising: 1 to 6% by weight of a hydraulic cement, and 94 to 99% by weight of particles of at least one refractory material whose main constituents are alumina (Al 2 O 3 ), zirconia (ZrO 2 ) and silica (SiO 2 ), the fraction of the particles of said basic mixture having a size less than 40 Î¼m being distributed in the following manner relative to the weight of said basic mixture: fraction<0.5 Î¼m: â‰§4% by weight fraction<2 Î¼m: â‰§5% by weight fraction<10 Î¼m: â‰§16% by weight fraction<40 Î¼m: 29â€“45% by weight said refractory composition further comprising, relative to the weight of said basic mixture, 0.02 TO 0.08% by weight of organic fibers, and 0.075 to 1% by weight of a surface-active agent.