Saflex is a plasticised polyvinyl butyral (PVB) film that bonds with glass under heat and pressure to form laminated safety glass. The Saflex interlayer sandwiched between the layers of glass is responsible for the enhanced performance properties of laminated glass. It is sold as refrigerated or interleaved rolls and is manufactured in a variety of formulations, colors, and thicknesses for use in laminated architectural, transportation and specialty glazings.