Measurement and modelling of the wettability of graphite by a silver-tin (Ag-Sn) liquid alloy

► We measure wettability of graphite by silver-tin (Ag-Sn) alloy. ► The system is found non-wetting, without dissolution or chemical interaction. ► The Butler equation is extended for the concentration dependence of contact angle. ► Reasonable agreement between experiment and theory is found.