high temperature long refractory fibers 50 sio 2 c powder 325 mesh 85 sio 2 15 c 10 sio 2 c and 6 8 mesh with a silica carbon ratio of 95 sio 2 and 5 carbon after the product is formed sodium silicate cement was applied with the vacuum process recited above regarding example 1 the resulting product had high resistance to abrasion good non wetting characteristics high strength hardness high temperature resistance and crush resistance the product had low density insulation value was average shrinkage was poor ingot stool covers ingot seals and ingot stool coating formed by vacuum forming the composition included 17 5 of high temperature refractory fiber 40 sio 2 c 85 sio 2 15 c powder 421 2 sio 2 c 6 8 mesh having a composition 98 sio 2 2 carbon the resulting product was cured with sodium silicate as in example 1 with a baume of 30 the resulting product had good non wetting properties good temperature resistance good breaking strength average cost poor crush strength poor abrasion resistance poor insulation characteristics poor shrinkage and hardness insulating block for a wide range of uses including structural uses the block formed by casting in a mold the following composition 30 secor high temperature alumina cement or portland cement depending on application and if high temperature resistant characteristics are not required 30 6 8 mesh sio 2 c at a ratio of 95 sio 2 to 5 carbon 35 1 8th inch particle size sio 2 c comprised of 97 sio 2.