Annealing of this material is accomplished in lehrs. An industrial method to produce a type of this material lays liquid raw materials over tin to form a float. (10[1])Diffusion of interfering ions described by the Nikolsky–Eisenman equation across this material is seen in electrodes, which can be used to measure pH. (10[2])Sintering particles of this material into hollow disks creates fritted examples (-5[1])of these materials that are used as filters. Addition of boron (-5[1])trioxide (10[1])lowers the coefficient of thermal expansion of these materials. (10[1])Silica, soda ash, (10[2])and limestone (10[1])produce the molten form of this material, which is then solidified by blowing. (10[2])For 10 points, what amorphous material is often used to make lab materials and window panes? ■END■ (10[1]0[1])