Indonesia's cement sales rose 15.6 per cent in May from a year ago, data from PT Semen Gresik Tbk showed on Thursday.        

Sales by volume in May rose 12.8 per cent month on month to 4.72Mt, according to the data. Most sales were on Java and Sumatra islands.        

Sales by volume in the eastern islands of Moluccas and Papua increased 40 per cent for the second consecutive month.