IKO Standard SBS Under layer consists of a glass tissue carrier coating with rapid flow SBS rubber modified bitumen. The upper surface is finished with fine sand and the lower surface has a thermofusible film which rapidly melts during the torching operation.IKO Premium SBS Under layer consists of a polyester carrier coated with rapid flow SBS rubber modified bitumen. The upper surface is finished with fine sand and the lower surface has a thermofusible film which rapidly melts during the torching operation.Features and Benefits Torch-on applied SBS modification with greater flexibility under ambient temperature fluctuations Polyester or glass base options Thermofusible film to the underside of the roll for ease of application Category: Roofing Sector of Application: Flat Product Type: Bituminous Membrane Type: Complementary Membranes, Underlay Colour: Sand Product Finish: Sand Installation Method: Torch-On Project Type: Commercial Small, Domestic Large, Domestic Medium, Domestic Small