Renkaasta jää punaista väriä lumeen?

[mikjus]

Ihan ei osu renkaan kukkimis "tire blooming" ilmiöön jossa väri ruskeahko mutta jotain erikoisia kemikaaleja näissä renkaissa voi olla, ei kuitenkaan selitä yhden puolen takarenkaan tapausta eli joku lisäreaktio tässä on pakosti mukana.

The real cause of why tires turn brown is a process called "blooming" This blooming, or tire browning, occurs mainly because of an element added to the rubber called antiozonant. It saves tires from premature drying and cracking due to the process of oxidation. It’s a continuing process that can be prevented by thoroughly cleaning and protecting the tires.
Why Antiozonant Causes Tire Sidewalls to Turn Brown

Tires bloom because antiozonant pushes its way to the outer edge of the rubber casing with time. As the element comes into contact with oxygen, it leaves a brown residue on the surface of the tire. Antiozonant is organic and helps tires last longer as it slows deterioration due to oxidation. This is what makes it possible to manufacture long-lasting high-mileage tires.


The rubber structure is built in a way that allows the element to move forward to the surface, thus continuingly providing the material with its benefits. As a result, the tire remains pliable and UV/oxygen-resistant for a longer time.


Mold Releases as Contributors to Tire Blooming

Mold releases used in tire manufacture don’t make tire sidewalls turn brown. However, they contribute to the issue as they keep antiozonant on the surface of the tire. Moreover, the more of it is left near the outer edge of the tire structure, the more the oxidation process will make it leave brown residue.


Mold releases are non-stick lubricants put in tire molds. They help release ready tires from the forms freely. Some of the lubricant usually remains on the tire, so it may contribute to blooming after just a couple of weeks of driving.