Penden Supreme Cement is the brand name of 43 Grade Ordinary Portland Cement (OPC) manufactured at Penden Cement as per IS:269-2015, using 95-97% in-house produced high quality Portland clinker and world’s purest mineral 3-5% gypsum sourced from Pemagatshel in Bhutan. Ordinary Portland Cement (OPC) is the oldest type of building material – cement produced by human kind artificially. However, due to low conversion factor from basic raw materials to final product (cement) production volume, the sustainability of manufacture of this type of cement is at stake with respect to raw materials consumption and conservation strategies and related environmental issues. As a result, this type of cement has become rare commodity in the market and is available for very specific purpose only. Therefore, today Penden Cement maintains the production of Penden Supreme in its product range only for very special and specific applications.