Cracks can be formed in many different elastomers by ozone attack, and the characteristic form of attack of vulnerable rubbers is known as ozone cracking. The problem was formerly very common, especially in tires, but is now rarely seen in those products owing to …

2014年2月13日 · Ozone cracking in tires happens when O3 gas is exposed to the tires for an extended period of time, causing the tire rubber’s polymer chains to break down and creating cracks in the sidewall of the tire.

What is ozone cracking? The rubber tends to change its properties when exposed to different environmental conditions. When exposed to extensive ozone presence, there appears crack on the surface.

2014年3月24日 · Specifically, ASTM D1171 is the standard test method for rubber deterioration – surface ozone cracking outdoors or chamber (triangular specimens). The advantage of this method is that it can be tested against a predetermined rating, creating a pass/fail condition.

Small cracks in tires, often known as “weathering” or “ozone cracking,” are a frequent occurrence, especially in aging tires. While some superficial cracks might not pose an immediate threat, deeper or more extensive ones can be a significant safety concern.

1981年7月18日 · In an atmosphere containing ozone, stretched samples of unsaturated elastomers develop surface cracks that grow in length and depth until they eventually sever the test piece. Even when they are quite small, they can cause a …

Ozone cracking is caused by an aggressive chemical attack on a double bonded seal polymer. Elastomers with double bonds in their molecular chains are highly susceptible to ozone attack. In their free state, the polymer remains unstressed, therefore the molecular interference prevents ozone from attacking the double-bonds.

2023年1月9日 · When someone asks me about a tire's warranty for cracking, I'll often use Michelin’s "Ozone or Weather Cracking Visual Tool" chart to help determine if tire cracking is cosmetic or severe and check the tire's manufacturer date.

The surface cracks that occasionally appear have been called many things: Weather Checking, Weather Cracking or Ozone Cracking. These small cracks typically develop in the sidewalls or at the base of the tread grooves.

Ozone cracking is a phenomenon that occurs in rubbers with unsaturated main chains when they are exposed to small amounts of ozone in the atmosphere at an elongation level above a specific threshold strain.