Bulletin of the National Research Centre

Table 4 Chemical composition of the design batch no. 3

From: Flux ceramic tiles based on Egyptian trachyte

Oxides %	30% trachyte	70% clay	Total
SiO₂	18.54	37.08	55.62
Al₂O₃	5.01	20.35	25.36
TiO₂	0.05	1.04	1.09
Fe₂O₃	1.49	2.74	4.23
CaO	0.34	0.35	0.69
MgO	0.09	0.14	0.23
Na₂O	2.39	0.04	2.43
K₂O	1.31	0.20	1.51
SO₃	0.02	0.53	0.55
ZrO2	0.08	–	0.08
LOI	0.49	7.43	7.92
Total	29.81	69.9	99.71

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