How can I protect my front windscreen from suns heat with LLumar films?
Question (8/17/2001): Can you tell me about the protectiveness of the front windshield? I got UV window film put on the rest of my car recently but I’m concerned about the sun that shines on me through the front. I know it offers some degree of protection due to the film placed between the two layers of glass, but is it significant or very minor? Answer: Less than 1% of the sun’s ultraviolet (UV) rays penetrate the windshield in newer vehicles. This is due to UV absorption by the PVB (polyvinylbutyral) interlayer that is used to laminate two sheets of glass together, making up the windshield unit. Some vehicles five years or more years old may allow as much as 10% of the UVA to transmit through the windshield glass. (In some countries, windshields are merely tempered glass, with no PVB interlayer at all.) UVB is screened by the glass itself and UVC is screened by the ozone layer of the earth’s atmosphere. If you are extremely sensitive to UV rays (due to a medical condition), UV absorp
