Which came first, neoprene or vulcanized rubber?
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Vulcanized rubber was invented in 1843, so it came first. Look up Charles Goodyear.
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"Natural" rubber comes from a tree. It is made from the sap of the tree.\n\nSynthetic rubber covers a lot of substances, so you would have to be more specific about the type.
118545
The history of the condom.
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Converse started in 1908 as the Converse Rubber Corporation. Converse and first version of the All Star basketball shoe was produced in 1917.
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I believe rubber is the actual product, natural, derived off of trees, plastic is petroleum based and/or manufactured.
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Kevlar is the DuPont Company's brand name for material made out of synthetic fiber of poly-paraphenylene terephthalamide which is constructed of para-aramid fibers that the company claims is five times stronger than the same weight of steel, while being lightweight, flexible and comfortable. It is also very heat resistant and decomposes above 400 °C without melting. It was invented by Stephanie Kwolek of DuPont from research into high performance polymers, and patented by her in 1966 and first marketed in 1971. Kevlar is a registered trademark of E.I. du Pont de Nemours and Company. Originally intended to replace the steel belts in tires, it is probably the most well known name in soft armor as bulletproof vests. It is also used in extreme sports equipment, high-tension drumhead applications, animal handling protection, composite aircraft construction, fire suits, yacht sails, as an asbestos replacement, and recently, even in R/C model helicopter blades and sometimes in loudspeaker cones.
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Rubber. PVC, oil (special types), mica, porcelain, tufnell, glass, teflon, silica, shellac, special varnishes in motors, and hundreds of different tyes of plastics.
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http://www.condomania.com/\n\nCustom made condoms.
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The proces is called vulcanization.\n\nSulphur are add to cross link the rubber.
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Well, rubber gloves are made of a special mix of portland cement, straw, Tennesse wiskey and aluminum.
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Thomas Savery invented the Steam Engine\nhttp://inventors.about.com/library/inventors/blsavery1.htm\n\nThe English word ``rubber'' was coined by Joseph Priestley, the discoverer of oxygen, from its use in rubbing out pencil marks. The term ``India rubber'' was given to it because it was first brought to Europe from the West Indies, the land that Columbus and his contemporaries thought was India. The word ``elastomer'' is now generally used to describe materials that have rubberlike properties.\n\nFrom excavations of ruins in Central and South America, it seems likely that rubber was known to the Maya Indians as early as the 11th century. It is reported that the Spaniards under Columbus saw the natives of Haiti using rubber in various ways. Long afterward, in 1731, Portuguese missionaries exploring the Amazon Valley found the Indians there using rubber to make useful articles.\n\nThe first record of scientific importance was written by Charles Marie de la Condamine, who was commissioned in 1735 by the Academy of Science of Paris to measure a degree of the meridian in South America. In his eight years of travel he made many observations and sent home, among other things, specimens of rubber. He wrote, ``The natives prepare watertight shoes of one piece from this material. They also spread it over an earthen flasklike form, and when the fluid has solidified, they break up the earthen form, remove the fragments through the neck of the bottle, and thus obtain a light, unbreakable vessel suitable for holding liquids.''
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It makes plastic and rubber.
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simple.Elastic is made from rubber.
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Ok... I was thinking of plastics...my bad..hehe\n\nHere`s some info I found\n\nToday Asia is the main source of natural rubber. Over half of the rubber used today is synthetic, but several million tonnes of natural rubber are still produced annually, and is still essential for some industries, including automotive and military.
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Mostly carbon and hydrogen.\nNatural rubber is a polymer of isoprene, a 5-carbon diene (has two double bonds).  It is not perfectly stable towards oxygen and especially with sunlight, hence, it degrades over time and becomes brittle.  When it's good and new though - C and H.
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The rubber tree initially grew only in Amazonia. Increasing demand and the discovery of the vulcanization procedure in 1839 led to a boom in that region, enriching the cities of Manaus and Belém. The name of the tree derives from Pará, the Brazilian state that contains Belém.\n\nThere had been an attempt made, in 1873, to grow rubber outside Brazil. After some effort, twelve seedlings were germinated at the Royal Botanic Gardens, Kew. These were sent to India for cultivation, but died. A second attempt was then made, some 70,000 seeds being sent to Kew in 1875. About 4% of these germinated, and in 1876 about 2000 seedlings were sent, in Wardian cases, to Ceylon, and 22 sent to the Botanic Gardens in Singapore. Once established outside its native country, rubber was extensively propagated in the British colonies. By 1898, a rubber plantation had been established in Malaya, and today most rubber tree plantations are in Southeast Asia and some also in tropical Africa. Efforts to cultivate the tree in its native South America were unsatisfactory.
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Depends entirely on the type of rubber, age, exposure to the elements, etc.  It is so widely variable there really is no answer.