Laminated windscreens and heat. Not many people know that heat will cause more damage to a laminated windscreen than cold weather and frost. On a hot summers day when temperatures are around 25-35 degrees celsius, the glass can reach temperatures in excess off 50-80 degrees. This causes the laminate (PVB) supporting the two layers of glass in a windscreen to become soft and pliable. This then causes the windscreen glass to become very weak and vulnerable to any sort of existi