Window films have been around for quite sometime but recent developments have included tint and polyester to help prevent certain things such as the sun’s harmful UV rays, hurricanes, accidents, and crime from happening. The single or multi-layered polyester films are very difficult to shatter since the goal is to hold all broken glass firmly inside the window frame once the glass is broken. So to Mother Nature and any criminals; Good Luck getting in! Window films are used on glass for multiple reasons; residential, decorative, frosted, privacy and stained glass all help the consumer save money on energy used and window films also prevent shards of glass from flying everywhere in case of an emergency. The films are adhesive coated to bond them to the glass. Better safety films are smooth coated and have a far more superior optical clarity.

Provided by http://www.homesecurityadvice.com/doors-windows/window-films/