Bulletin . ?. KAOLINS. 77 mesh sieve. The plasticity developed on mixing the clay with 40 per centwater is only fair, and the air shrinkage, owing to the presence of a largeamount of grit, is low, per cent. It burns white, and even at Cone 1is nearly steel hard, but as might be expected the absorption is high, andthe fire shrinkage low. Thus at Cone 010 the fire shrinkage and absorptionwere and per cent, respectively. At Cone 05 the fire shrinkage andabsorption were 1 and per cent, respectively. At Cone 1 they were4 and per cent. At this last cone the brieklets had a goo
Bulletin . ?. KAOLINS. 77 mesh sieve. The plasticity developed on mixing the clay with 40 per centwater is only fair, and the air shrinkage, owing to the presence of a largeamount of grit, is low, per cent. It burns white, and even at Cone 1is nearly steel hard, but as might be expected the absorption is high, andthe fire shrinkage low. Thus at Cone 010 the fire shrinkage and absorptionwere and per cent, respectively. At Cone 05 the fire shrinkage andabsorption were 1 and per cent, respectively. At Cone 1 they were4 and per cent. At this last cone the brieklets had a good ring. Two samples of the washed kaolin were tested, one in more detail thanthe other, and the results are tabulated below, for purposes of comparison. 2167From stock house 2168 From stock pile at old plant Water required .Air shrinkage . .Cone 010 Fire shrinkage Absorption . . Color Ring Cone 1 Fire shrinkage Absorption . . Ring Steel hard . .Cone 9 Fire shrinkage Absorption . . Steel hard . . 40%
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