DUNLOP MAKES WORLD¢S FIRST SELF-SEALING TIRE
1948 - Dunlop launches a tubeless tire featuring a self-sealing layer, to prevent further air leaks in the event of a puncture.
By 1954, when further development rendered the sealant layer unnecessary, it is estimated that the number of punctures causing road delays had been reduced from one in 16,000 miles with tubed tires, to one in 80,000 miles on tubeless ones.
Self-sealing tires are designed to fix most tread-area punctures instantly and permanently. These tires feature standard tire construction with the exception of an extra lining inside the tire under the tread area that's coated with a puncture sealant that can permanently seal most punctures from nails, bolts or screws up to 3/16 of an inch in diameter. These tires first provide a seal around the object when the tire is punctured and then fill in the hole in the tread when the object is removed. Because these tires are designed to seal the tire immediately upon being punctured, most drivers will never even know that they just had a puncture. Also because these tires feature standard tire constructions, the traditional loss-of-air symptoms that accompany a flat tire remain to warn the driver if the tire is damaged beyond repair. Therefore, self-sealing tires do not require a low air pressure warning system.