Fly ash technology Flux bonded fly ash technology developed by National Institute for Interdisciplinary Science & Technology (NIIST) uses fly ash to the extent of 80% in the building material and hence reduces the clay demand to less than 15%. This technology is eco friendly and first of its kind to utilise high volume of fly ash for fired products. While the bricks and tiles made using this technology have better properties than clay based building components, colour of the products remain similar to that of conventional ‘fired bricks and tiles’. Flux bonded fly ash products have strength 80 – 120 kg/sq. cm, density 1.3 – 1.4 gm/cub. cm and water absorption 15 – 20%, brick red colour and texture similar to fired clay products. In abstract, this technology provides a very unique and exclusive opportunity for effective utilization of large volumes of fly ash, which is rather an industrial waste. This technology has been transferred to a company in Telungana Region of Andrapradesh.