SEK DDR Belgrade is established in Belgrade and the core business is projects of buildings and selling building material. Now we are offering fly ash from Serbia in jumbo bags for building and construction industry. It can be used also per asfalt."Klasa,micro m"-800+6001,871,45-600+4251,861,50-425+3002,764,72-300+2127,967,13-212+15014,4513,48-150+6370,6771,16-63+00,430,56Ash is class C and class F. If you are interested please do not hesitate to contact us.