Table 1: Oxide compositions of raw stock.

Model numberOxides, mass%
SiO2Al2O3CaOMgO Na2O K2OFe2O3TiO2MnOP2O5SO3B2O3As

1
35% catalyst
50.3512.0012.101.501.902.806.800.500.050.050.700.7010.55
2
30% catalyst
54.807.0015.901.102.501.704.200.300.030.030.400.9011.14
3
25% catalyst
56.006.7016.100.902.801.903.300.200.020.020.301.2010.56