Rubber | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-07

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Natural_rubber


00:01:07 1 Varieties
00:01:16 1.1 iHevea brasiliensis/i
00:01:45 1.2 Congo rubber
00:02:03 1.3 Dandelion
00:02:54 1.4 Other
00:04:05 2 History
00:07:53 2.1 Pre-World War II
00:09:56 3 Properties
00:10:52 3.1 Elasticity
00:12:33 3.2 Malodour
00:13:34 4 Chemical makeup
00:14:49 4.1 Biosynthesis
00:17:09 5 Production
00:18:04 5.1 Cultivation
00:19:20 5.2 Collection
00:21:39 5.2.1 Field coagula
00:22:27 5.2.1.1 Cup lump
00:22:58 5.2.1.2 Tree lace
00:23:23 5.2.1.3 Smallholders' lump
00:24:34 5.2.1.4 Earth scrap
00:25:16 5.3 Processing
00:26:31 5.4 Vulcanized rubber
00:27:05 5.5 Transportation
00:27:50 6 Uses
00:30:23 7 Allergic reactions
00:31:17 8 Microbial degradation
00:31:42 9 See also



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SUMMARY
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Natural rubber, also called India  rubber or caoutchouc, as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds, plus water. Thailand and Indonesia are two of the leading rubber producers. Forms of polyisoprene that are used as natural rubbers are classified as elastomers.
Currently, rubber is harvested mainly in the form of the latex from the rubber tree or others. The latex is a sticky, milky colloid drawn off by making incisions in the bark and collecting the fluid in vessels in a process called "tapping". The latex then is refined into rubber ready for commercial processing.  In major areas, latex is allowed to coagulate in the collection cup. The coagulated lumps are collected and processed into dry forms for marketing.
Natural rubber is used extensively in many applications and products, either alone or in combination with other materials. In most of its useful forms, it has a large stretch ratio and high resilience, and is extremely waterproof.