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Ebonite is a brand name for a material generically known as hard rubber or vulcanite, obtained via vulcanizing natural rubber for prolonged periods. Ebonite may contain from 25% to 80% sulfur and linseed oil. [1] [2] Its name comes from its intended use as an artificial substitute for ebony wood.
Signature Lacrosse Ball. A lacrosse ball is the solid rubber ball that is used, with a lacrosse stick, to play the sport of lacrosse.It is typically white for men's lacrosse (however the PLL uses optic yellow balls for better TV visibility [1] [2]), or yellow for women's lacrosse; but the balls are produced in a wide variety of colours.
The earliest archeological evidence of the use of natural latex from the Hevea tree comes from the Olmec culture, in which rubber was first used for making balls for the Mesoamerican ballgame. Rubber was later used by the Maya and Aztec cultures: in addition to making balls, Aztecs used rubber for other purposes, such as making containers and ...
Roller hockey ball obtained via vulcanisation. In ancient Mesoamerican cultures, rubber was used to make balls, sandal soles, elastic bands, and waterproof containers. [4] It was cured using sulfur-rich plant juices, an early form of vulcanization. [5] In the 1830s, Charles Goodyear worked to devise a process for strengthening rubber tires ...
A solid rubber ball used (or similar to those used) in the Mesoamerican ballgame, 300 BCE to 250 CE, Kaminaljuyu. The ball is 3 inches (almost 8 cm) in diameter, a size that suggests it was used to play a handball game. Behind the ball is a manopla, or handstone, which was used to strike the ball, 900 BCE to 250 CE, also from Kaminaljuyu.
A superball or power ball is a bouncy ball composed of a type of synthetic rubber (originally a hard elastomer polybutadiene alloy named Zectron) invented in 1964, which has a higher coefficient of restitution (0.92) than older balls such as the Spaldeen so that when dropped from a moderate height onto a level hard surface, it will bounce nearly all the way back up.