Puncture sealing depends partly upon centripetal acceleration (often wrongly described as ‘centrifugal force’). This in the case of a moving vehicle is the force of the tyre’s circulation, and it imparts a huge pressure which – combined with the sudden loss of air – when a puncturing object causes a hole, forces the OKO violently into a small space. The squeezing effect causes OKO to deploy as it is designed to do, turning it from a liquid into a flexible but very strong solid that seals the hole almost instantaneously.
Little air is lost and only a few ml of OKO is used: the rest of the liquid in the tyre well keeps on revolving, ready to counter the next puncture, for the legal life of the tyre.
Unlike other sealant companies, OKO has invested heavily in independent testing, using meaningful protocols. To assess whether its seal is genuinely permanent, a strength test was carried out by the world-renowned military testing institution, Gerotek. The tyre industry recognises one ‘permanent’ repair type: vulcanising. On testing vulcanised, plugged and OKO-sealed punctures to destruction, the Institute found that OKO was 1.6 times stronger than vulcanisation: and 7 times stronger than the widely-used plug repair approach.
People often ask why the OKO does not gum up a tyre valve when you let a little air out. In this situation there is no centripetal acceleration and the OKO is not deployed, also the sealant is not normally in proximity to the valve.