Siping (rubber) wear and extends the life of the tire. Both Bridgestone and Michelin sell snow tires that are siped at the factory, while Saf-Tee Siping and Grooving sells machines that can sipe most standard vehicle tires. Siping can also be done by hand. Siping tires may void the manufacturer's warranty. Claims that extended life is achieved by siping may only apply to certain environments, operating temperatures, and rubber compound builds. Siped soles are a characteristic feature of boat shoes. Siping (rubber) Siping is a process of cutting thin slits across a rubber surface to improve traction in wet or icy conditions.
International Rubber Regulation Agreement „Reichsverband der deutschen Kautschukindustrie”. Other countries, e.g. Japan or the Sowjetunion, had got no representation. The United States tried to become independent of the rubber cartel: establishing rubber plantations in territories under its control; conducting research into rubber-producing plants that thrive in the United States' climate; and reinvigorated efforts to replace natural rubber in tires with a synthetic. In the Fordlandia venture, Henry Ford failed in an attempt to produce rubber in Brazil. The Goodyear Tire and Rubber Company developed plantations in the Philippines and Costa Rica and Harvey Firestone developed plantations in Liberia. Research into synthetic rubber was limited