Black Tyres

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Answered by: bhargavmech

View all answers by bhargavmech

Member Since Jul-2009 | Answered On : Aug 5th, 2009

When Tyres are parked for extended periods, tires dry out, discolor and eventually crack and split. The major factor degrading tires and other synthetic and rubber products is ozone, an odorless gas which is part of the air we breath. When combined with ultraviolet light (the invisible part of sunlight) a reaction occurs that attacks the tire polymer. To protect against ozone and UV damage, a stabilizer molecule called a “competitive absorber” is blended with the tire polymer. Competitive absorbers work by capturing and absorbing UV radiation and converting it to heat which is dissipated harmlessly. All tire manufacturers use the same competitive absorber, carbon black. This is why all tires are black