Egypt's National Cement posted a 21 per cent rise in nine-month profit to 257.2 million Egyptian pounds, the stock exchange said on Tuesday. The cement firm made net profit of 212.4 million pounds in the same July-to-March period a year earlier. The stock exchange release did not give a reason for the increase in net profit. National Cement, majority controlled by state-owned Chemical Industries Holding Co., produces and trades cement, clinker and related construction materials.