. High fire porcelain glazes. . 1:10 1315 7 .500 1:8 1115 32 1:8 1317 8 .666 1:5 1114 33 1:6 1336 9 .800 1:6 1124 34 1:5 1386 10 1:4 1210 35 1:4 1461 11 .500 1:10 1124 Ai .333 1:12 1175 12 .625 1:8 1124 Ai .416 1:12 1151 13 .833 1:6 1157 A3 .583 1:12 1148 14 1:5 1173 A< .750 1:12 1183 15 1:4 1223 A& .916 1:12 1252 16 .700 1:10 1147 A« 1:12 1317 17 .875 1:8 1159 Bi .333 1:15 1169 18 1:6 1208 B2 .466 1:15 1149 19 1:5 1
. High fire porcelain glazes. . 1:10 1315 7 .500 1:8 1115 32 1:8 1317 8 .666 1:5 1114 33 1:6 1336 9 .800 1:6 1124 34 1:5 1386 10 1:4 1210 35 1:4 1461 11 .500 1:10 1124 Ai .333 1:12 1175 12 .625 1:8 1124 Ai .416 1:12 1151 13 .833 1:6 1157 A3 .583 1:12 1148 14 1:5 1173 A< .750 1:12 1183 15 1:4 1223 A& .916 1:12 1252 16 .700 1:10 1147 A« 1:12 1317 17 .875 1:8 1159 Bi .333 1:15 1169 18 1:6 1208 B2 .466 1:15 1149 19 1:5 1218 B3 .600 1:15 1180 20 1:4 1292 B4 .733 1:15 1230 21 .900 1:10 1209 B& .867 1:15 1376 22 1:8 1224 Ci .350 1:20 1207 23 1:6 1230 Cj .450 1:20 1237 24 1:5 1248 C3 .550 1:20 1398 25 1:4 1370 C4 .650 1:20 1410 The results are plotted for the molecular variations of aluminaand silica (Fig. 1) and for the batch weights (Fig. 2), for which. 16 ao ZQUIVALCNT5 SiOt Fig. 1.—Deformation temperatures IIjO izo CVTETCTIC miis the glazes were calculated into percentages of clay, flint, andfluxes (feldspar and whiting in the proportion of 167 feldspar to70 whiting). 6 Technologic Papers of the Bureau of Standards As shown in Fig. i, increase in silica to n equivalents main-taining the alumina constant has little effect in comparison withalumina in increasing the deformation temperature as the iso-therms run in the general direction of the alumina ordinate upto ii equivalents. Beyond this figure increase in silica has amore pronounced effect on the deformation temperature. Starting with A1203 and any silica content, increasing theA1203 lowers the deformation temperature until the eutectic axisis crossed. Further increase in A1203 raises the deformationtemperature. fluxes cuTEcnc Axrshighfireporcel1921196sort
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