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In 1770 English engineer Edward Nairne is reported to have developed the first widely marketed rubber eraser, for an inventions competition. Until that time the material was known as gum elastic or by its Quechua name (via French) caoutchouc. Nairne sold natural rubber erasers for the high price of three shillings per half-inch cube. [5]
Some natural rubber sources, such as gutta-percha, are composed of trans-1,4-polyisoprene, a structural isomer that has similar properties. Natural rubber is an elastomer and a thermoplastic. Once the rubber is vulcanized, it is a thermoset. Most rubber in everyday use is vulcanized to a point where it shares properties of both; i.e., if it is ...
A kneaded eraser, also commonly known as a putty rubber, is a pliable erasing tool used by artists. It is usually made of a grey or white unvulcanized rubber (though it can be found in many different colors, such as green, blue, hot pink, yellow, and so forth) resembling putty or chewing gum.
One of the earliest references to rubber in Europe appears to be in 1770, when Edward Nairne was selling cubes of natural rubber at his shop at 20 Cornhill. The cubes, meant to be erasers, sold for the astonishingly high price of 3 shillings per half-inch cube. Prior to using rubber, breadcrumbs were used as erasers. Nairne says he ...
Palaquium gutta. Gutta-percha is a tree of the genus Palaquium in the family Sapotaceae.The name also refers to the rigid, naturally biologically inert, resilient, electrically nonconductive, thermoplastic latex derived from the tree, particularly from Palaquium gutta; it is a polymer of isoprene which forms a rubber-like elastomer.
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