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Tire Making, episode four
On 12/30/2009 11:44 AM, Jobst Brandt wrote:
...... That carbon black in tires aids in wear resistance and wet traction is well known and the reason why you don't see high performance auto tires in any other color than black. White knobby tires on children's bicycles don't wear long or corner well anywhere, but they are a standard of fashion for the little tykes. ...... No offense, but where does it say that carbon black aids in wet traction? I haven't seen that mentioned anywhere so far. The introduction of inert fillers was to stiffen the rubber and improve its wear characteristics; the natural rubber also needed colorants in order to try to help protect it from UV damage from sunlight. Carbon black is one of a very-few fillers that can effectively do both jobs at the same time--but then, iron oxide seemed to be another. Iron oxide seems to boost traction more than carbon black does; why else would Kool Stop be using iron oxide in their brake pads, and not carbon black instead? Salmon Kool-Stops have a pretty good reputation far and wide, yet we see no red-colored modern performance car tires. ?:| ? ~ |
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