The windshields are usually constructed from three relatively flat pieces of Lexan. … But instead of replacing them, the NASCAR teams apply an adhesive film to the windshields that is harder than the Lexan and as clear as glass. After each race, the film can be peeled off and replaced, leaving the Lexan unscratched.

How many tear offs are on a NASCAR windshield?

The cars are fitted with seven layers of tear-off windshield before the race.

How thick is a NASCAR windshield?

As shown in Table one, from 2000 through 2012 NASCAR vehicles were required to use a ¼ inch thick hard coated polycarbonate windshield. The typical properties for this polycarbonate material are shown in Table two.