A low temperature process for making radiopac materials is disclosed. The process utilizes industrial/agricultural waste as raw materials and includes mixing 11-88% w/w of the industrial/agricultural waste materials, 11-88% w/w of an alkali or alkaline earth metal compound and 7-15% w/w of a phosphatic binder to obtain a homogenized mixture. The homogenized mixture is compressed at a pressure in the range of 100-300 Kg/cm.sup.2 to obtain compacted green material samples. The compacted green material samples are baked for 1-3 hours in an Air oven in the temperature range of 90-130.degree. C., and are sintered at a temperature in the range of 920 to 1300.degree. C. for a soaking period of 1-3 hours under air environment in a muffle furnace to obtain the radiopac material.