In this study, soda-lime silica waste glass was used as partial and total replacement for feldspar in porcelain. The prepared
samples from feldspar, quartz, kaolin and different percentages of waste glass by powder technology technique were sintered
at 1,100 ?C and 1,200 ?C. The tests measured for samples involves mechanical, physical and thermal properties. A results of
these tests indicated an increasing and decreasing in the samples properties with increasing of waste glass additive, and that
continues to 75% waste glass of feldspar. While X-ray diffraction analysis indicated a presence of tridymite phase SiO2, mullite
phase 2SiO2.3Al2O3 and anorthite phase CaAl2Si2O8 in the sample contained 100% waste glass of feldspar and fired at
1,200 ?C. This study showed possibility of replacement of feldspar used in porcelain industry by waste glass as flux, and a
percent of waste glass additive, which gives the best properties of porcelain samples, is 75% wt. of feldspar.