With its headquarters in Izmir, the foundations of BTM, leading insulation company of Turkey, were laid in Istanbul in 1975 by Turkiye Sise Cam Group. It has been increasingly maintaining its operations through its new and technological investments in its production plants in the Kemalpasa Organised Industrial Zone at Izmir since 1986. It has a total of five plants where waterproofing, heat insulation and roof covering materials are produced. A company of the BTM Group, Polpan Kz is a plant operating in Kazakhstan and producing 130.000 m3 thermal insulation boards per year.Undersigning firsts in Turkey, BTM has clinched its leading position in the insulation sector through the polymer bituminous waterproofing membrane in 1989; closed-pore XPS thermal insulation boards in 1995 and roof covering material Shingle in 1996 for the first time. BTM started manufacturing synthetic membranes under the brand of Polypan in 2007.