ASBESTOS - EHS DB.com · 2015-10-17 · asbestos awareness office of environmental health and...
Transcript of ASBESTOS - EHS DB.com · 2015-10-17 · asbestos awareness office of environmental health and...
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ASBESTOSAWARENESS
OFFICE OF
ENVIRONMENTAL HEALTH AND SAFETY
UNIVERSITY OF ARKANSAS
JANUARY 2011
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WHAT IS IT ?• FIBROUS MINERAL• NATURALLY OCCURING• SILICA BASED• HEAT RESISTANT• SEVERAL TYPES
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CHRYSOTILE
• “WHITE ASBESTOS”
•SPIRAL SHAPED FIBERS
• LESS LIKELY TO BEINHALED DUE TO SHAPE
• RELATIVELY “SAFE”
• STILL USED IN US
• LONG TERM EXPOSURECAN CAUSE HEALTHPROBLEMS
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AMOSITE
• “BROWN ASBESTOS”
• BROWN OR GRAY FIBERS
• ONCE THE SECOND MOSTCOMMONLY USED
• COMMERCIAL USE HASDECREASED DUE TO HAZARD
• BANNED IN SOME COUNTRIES
• TIGHTLY REGULATED IN US
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CROCIDOLITE
• “BLUE ASBESTOS”
• MOST DANGEROUS TYPE
• VERY FINE, SHARP FIBERS
• EASILY BROKEN ANDINHALED
• LEAST COMMONLY USEDIN US
• WEAKER, LESS FLAMERESISTANT
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TREMOLITE
• LARGE DEPOSITS IN CANADA AND US
• DANGEROUS, BUTNOT COMMONLY USED
• HAS BEEN FOUND INHOUSEHOLD PRODUCTSSUCH AS TALCUM POWDER
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ANTHOPHYLLITE
• NOT AS DURABLE AS OTHERS
• NOT AS MANY USES
• MOSTLY PAINTS AND SEALANTS
• MINERS, PAINTERS,SHIPYARD WORKERS AT RISK
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ACTINOLITE
• SIMILAR TO TREMOLITE
• WHITE TO GREEN IN COLOR
• NOT A LONG HISTORY OFINDUSTRIAL USE
• FOUND IN TWO FORMS
• FIBROUS FORM DANGEROUS
• NON-FIBROUS, NOT AS MUCH
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USED SINCE NEOLITHIC TIMES
FIRST RECORDED USE IN 2500 BC
WOVEN INTO CLOTH FOR SHROUDS, NAPKINS, TABLECLOTHS
GREEKS USED ASBESTOSLAMP WICKS
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DANGERS HAVE NOT ALWAYS BEEN RECONIZED
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DOES NOT BURN HEAT SHIELDS
FIRE CURTAINSHEATED VESSELS
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BUILDING TRADESUSED EXTENSIVELY IN THE . . .
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SPECIALTY USES
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NOVELTIES
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WHY BE CONCERNED?
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MESOTHELIOMA
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GREEK GEOGRAPHERSTRABO NOTED “SICKNESS IN THE LUNGS” OF SLAVES WHO WOVEASBESTOS CLOTH
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ASBESTOS FIBERS MACROPHAGE CELL
MESOTHELIOMA
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EXACERBATED BY SMOKING
KENT’S FAMOUS FILTERS CONTAINED ASBESTOS
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PARTICLE SIZE MATTERS !
IMPORTANT !
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PARTICLES MUST BE SMALL ENOUGH TOREACH THE LUNGS
100 um OR GREATERTYPICALLY NOT INHALED
10 – 100 umTRAPPED AND EXPELLED BYUPPER RESPIRATORY SYSTEM
LESS THAN 10 umMAY REACH LUNG
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EASILY CRUMBLEDOR PULVERIZED
FRIABILITY MAY RESULTIN RESPIRABLE PARTICLES
FRIABLE
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FRIABLE ASBESTOSMUST BE REMOVEDOR ENCAPSULATED
REMOVAL OR ABATEMENTOF FRIABLE ASBESTOSREQUIRES NEGATIVE AIR CONTAINMENT
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IS THERE ASBESTOS IN UNIVERSITY OF ARKANSAS BUILDINGS ?
SHOULD I BE CONCERNED ?
• CEILINGS• FLOOR TILES• PIPE WRAP
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THE UNIVERSITY MAINTAINSA DATA BASE OF ASBESTOSLOCATIONS.
FACILITIES MANAGEMENTHAS A CREW OF CERTIFIEDASBESTOS WORKERS.
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FRIABLE ASBESTOS IS REMOVED ORENCAPSULATED
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NON-FRIABLE MATERIALIS REMOVED AS FEASIBILITY PERMITS
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ASBESTOS IS REMOVEDDURING RENOVATIONS
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ALL ABATEMENT IS PERFORMED BY CERTIFIED PERSONNEL
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N
ALL WORK IS PERFORMED UNDER APPROPRIATECONTAINMENT*
* note negative pressure
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SCIENCE AND ENGINEERINGBUILDING
• BUILT PRIOR TO 1978• RENOVATED 2002
CROSS SECTION OF ASBESTOS CONTAININGACOUSTIC CEILING
FRIABLE MATERIALABATEMENT WORK ISPERFORMED UNDERCONTAINMENT
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WEST AVENUE ANNEX
• 9 X 9 FLOOR TILE REMOVED• CONTAINMENT NOT NECESSARY
FLOOR TILE DOES NOT BECOME FRIABLE UNLESS SUBJECTED TO OPERATIONS SUCH AS BURNISHING,SAWING, OR SANDING. ORDINARY REMOVAL METHODSDO NOT CALL FOR NEGATIVE AIR CONTAINMENT.
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THERE IS SOME EVIDENCE THATTHE RISKS OF ASBESTOS EXPOSUREMAY HAVE BEEN OVERSTATED INTHE PAST, PERHAPS CAUSINGUNWARRANTED ANXIETY.
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AS WITH OTHER HAZARDS,
UA PREFERS TO EXERCISE . . .
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