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Ch.4. Asbestos in the Environment

Ch.4. Asbestos in the Environment . Introduction Properties and uses Brief history Environmental hazards. Introduction Asbestos : asbestoz “ inquenchable ” “inextinguishable” Fibrous silicate minerals: s erpentine & amphiboles White, brown, blue & others. crocidolite. chrysotile.

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Ch.4. Asbestos in the Environment

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  1. Ch.4. Asbestos in the Environment • Introduction • Properties and uses • Brief history • Environmental hazards

  2. Introduction • Asbestos: asbestoz“inquenchable” “inextinguishable” • Fibrous silicate minerals: serpentine & amphiboles • White, brown, blue & others crocidolite chrysotile Asbestos fibre tremolite From http://en.wikipedia.org/wiki/Asbestos

  3. Properties & Use • Properties: • Mineral: insulation (heat, electricity), resistance against fire & chemical reaction, incombustibility • Fibre: flexibility, capability of being woven, sound-absorbing • Uses • (See the table on the next page)

  4. Brief History • B.C. ca. 3,000 Scandinavian remains – used in porcelain and filler among the logs • 1C : Greek island Evvoia – Asbestos mining querry • Early Greek-Roman: unflammable clothes and building materials • Pliny the Elder: Thought to be used for the protection from the curse Pliny the Elder (23-79), a.k.a. Caius Plinius Secundus, Gaius Plinius Secundis. Author of the grand encyclopedia "Naturalis Historiae".

  5. Ancient Egyptian: Used for Parao’s mummy • Ancient Persian: Imported from China, Used for the cloths for deaths, thought as feather of saramanda (phoenix) • Others: Lamp wick of tomb, Cure for itching Saramanda on a tile from ancient Iranian heritage http://www.metmuseum.org

  6. Marco Polo (1254-1324): “Livres des merveilles du monde”  Clothes being cleaned in fire?

  7. In medieval times, asbestos was frequently used for the insulation of armor • Some fraud merchants made cross with asbestos and deceive people with it as if that was a part of the cross on which Jesus Christ was nailed (hung, executed)

  8. 19C: Industrial revolution also trigger modern application of asbestos • Used as heat insulator in USA & Canada in 1860’s • First commercial asbestos mine in Quebec, Canada, in 1879. • 20C: rapid increase of asbestos consumption • After 1970’s: Health threats (hazards) by asbestos became obvious  invoke lot of regulations against asbestos usage. Ban of asbestos usgae  Sudden decrease of asbestos consumption

  9. Asbestos production and consumption Global production (10,000 ton/year) Japan (ton/year) China Korea

  10. Now, the usage of asbestos is banned or limited in most countries • For Korea, • From 2009.09, asbestos is banned to be used in any industrial product • From 2007.07, any product containing asbestos is banned to import, produce, or use.

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