Editing Ozone (section)

====Ozone cracking====
{{Main|Ozone cracking}}
[[File:Ozone cracks in tube1.jpg|thumb|Ozone cracking in [[natural rubber]] tubing]]
Ozone gas attacks any [[polymer]] possessing olefinic or [[double bond]]s within its chain structure, such as [[natural rubber]], [[nitrile rubber]], and [[styrene-butadiene]] rubber. Products made using these polymers are especially susceptible to attack, which causes cracks to grow longer and deeper with time, the rate of crack growth depending on the load carried by the rubber component and the concentration of ozone in the atmosphere. Such materials can be protected by adding [[antiozonant]]s, such as waxes, which bond to the surface to create a protective film or blend with the material and provide long term protection. [[Ozone cracking]] used to be a serious problem in car tires,<ref>{{cite journal |last1=Layer |first1=Robert W. |last2=Lattimer |first2=Robert P. |title=Protection of Rubber against Ozone |journal=Rubber Chemistry and Technology |date=July 1990 |volume=63 |number=3 |pages=426–450 |doi=10.5254/1.3538264}}</ref> for example, but it is not an issue with modern tires. On the other hand, many critical products, like [[gasket]]s and [[O-ring]]s, may be attacked by ozone produced within compressed air systems. [[Fuel line]]s made of reinforced rubber are also susceptible to attack, especially within the engine compartment, where some ozone is produced by electrical components. Storing rubber products in close proximity to a [[Direct Current|DC]] [[electric motor]] can accelerate ozone cracking. The [[commutator (electric)|commutator]] of the motor generates sparks which in turn produce ozone.