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F1 EXPLAINED: What does porosity mean?

August 17, 2025
in Formula 1
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By Balazs Szabo on 17 Aug 2025, 19:00

With the System One spending its well-deserved summer time break, F1Technical’s senior author Balazs Szabo explains how floor porosity can result in untimely degradation.

Pirelli has been the only real tyre provider in System One since 2011 following Bridgestone’s resolution to withdraw from the position on the finish of the 2010 season.

The Italian producer beforehand competed in System One from 1950–1958, 1981–1986 and 1989–1991. Along with his position at System One as sole tyre provider, Pirelli additionally provides tyres for the FIA System 2 Championship , FIA System 3 Championship and F1 Academy, that type the feeder collection to System One.

What does porosity imply?

System 1 tyres develop floor porosity on account of the extreme mechanical and thermal stress to which they’re subjected. The tyre deforms, particularly beneath acceleration and braking, extra so on tough surfaces and this causes vitality and warmth to construct up within the compound.

If temperatures exceed the optimum working window, microcavities and floor irregularities can type and this floor porosity can result in untimely degradation.

Microcavities also can result in the formation and growth of fuel or vapour bubbles, often known as blisters, between the carcass and the tread. Extreme put on can partially separate the rubber layers and these bubbles can evolve into craters or holes on the tread floor.

This is named blistering, seen normally as darkish streaks or broken areas on the tread. This phenomenon is extra widespread on a monitor that isn’t rubbered-in a lot, with excessive floor temperatures and with a really aggressive driving fashion.

F1earlier



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