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.
Cooper Tire & Rubber Company seals for home and commercial refrigerators. In December, 2003, Cooper agreed to a joint venture with Kenda Rubber Industrial Company, to construct a tire-manufacturing plant near Shanghai. In January, 2005, Cooper agreed to purchase 11% of South Korea-based Kumho Tires Company, and also announced the formation of a new commercial division encompassing both Oliver Rubber Company and commercial tires. In October, 2005, Cooper announced an agreement to obtain 51% ownership in China’s third largest tire manufacturer, Cooper Chengshan (Shandong) Passenger Tire Company Ltd., and Cooper Chengshan (Shandong) Truck Tire Company Ltd., to produce truck and passenger car tires for mainland