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Examples of CEL2 glass-ceramic foams with different solid content (wt %) and after firing at 900–1000 °C for 1 h; (a–c) foams with 58 wt % solid loading fired at 900 °C; (d,e) for foams with 60 wt % solid loading fired at 900 °C; (f) foams with 58 wt % solid loading fired at 1000 °C.
