Low-melting low-lead glasses based on borate systems

The results of experimental studies of the production of low-melting glasses with low lead oxide content for fluxes of silicate paints based on two borate systems not previously studied are presented. The predictable changes of the softening onset temperature, the total flow, and the CLTE are established. The crystallization power of the glasses is studied. The results of these investigations are used as a basis to propose compositions with 20–25 wt.% PbO (molar content 6–10%) and burn-in temperature of paints based on them 560–580°C.