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Asbestos. Dr Jim Lister Environment Group Manager. Asbestos. Asbestos is the generic name for six naturally occurring minerals Physical properties Strength Flexibility Insulating Properties Resistance to heat and Chemicals Low electrical conductivity. Types of asbestos.

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asbestos
Asbestos

Dr Jim ListerEnvironment Group Manager

Glasgow Scientific Services

asbestos1
Asbestos
  • Asbestos is the generic name for six naturally occurring minerals
  • Physical properties

Strength

Flexibility

Insulating Properties

Resistance to heat and Chemicals

Low electrical conductivity

Glasgow Scientific Services

types of asbestos
Types of asbestos
  • Chrysotile (white) White curly fibres
  • Amosite (brown) Straight sharp fibres
  • Crocidolite (blue) Straight fibres
  • Other Types Anthophyllite, Tremolite and Actinolite

Glasgow Scientific Services

asbestos the hazard
Asbestos - The Hazard
  • Asbestos is the single biggest cause of work related deaths in the UK. - HSE
  • 3000 Deaths per year associated with Asbestos - due to past exposure
  • Airborne Hazard – Fibres are produced when asbestos containing materials are disturbed
  • Respirable fibres – enter lung – cause fatal disease
  • Materials that remain undisturbed – no risk to health

Glasgow Scientific Services

risk factors
Risk Factors
  • Asbestos related diseases are caused by the inhalation of Asbestos fibres.
  • Fibres have to be respirable.

Specific dimensions

  • Risk Factors CONCENTRATION +

DURATION = DOSE

  • Some evidence that Asbestos diseases follow a dose response relationship.

Glasgow Scientific Services

latency period for asbestos disease
Latency Period For Asbestos Disease
  • Time taken from first exposure to discovery of illness.
  • Shortest latency period is 5-10 years
  • It can often take up to 40 years or more
  • No safe level of exposure
  • Secondary Exposure

Glasgow Scientific Services

asbestos diseases
Asbestos diseases
  • Fibres that are not cleared from the lungs and remain trapped in the body can cause a range of diseases.
  • Asbestos lung cancer- fibres remaining trapped in the lung –severe respiratory damage High Asbestos concentrations
  • Mesothelioma- translocation of fibres to the pleura causing malignant disease in the thin membranes lining the chest. - Lower Asbestos concentrations

Glasgow Scientific Services

identification of asbestos principle
Identification of Asbestos - Principle
  • Survey area-collect representative samples of all suspect materials.
  • Visual Examination of Bulk Material
  • Removal of sub-samples ( usually fibrous material ) from the bulk material
  • Mounting sub-sample on slide and clearing with acid or solvent.
  • Microscopal examination using plane and polarised light.

Glasgow Scientific Services

identification of asbestos equipment
Identification of Asbestos - Equipment
  • Glass Jars or polythene bags for collection of samples
  • Disposable gloves
  • Tweezers/pliers
  • Wash bottle (water)
  • Microscope slides and cover slips
  • Tissues
  • Hydrochloric acid, solvent
  • Polarising microscope

Glasgow Scientific Services

identification of asbestos
Identification of Asbestos
  • Assess and survey the area and secure a representative sample.
  • Place sample jar/ bag in fume cupboard
  • Sort through sample with tweezers – transfer any fibrous material to slide

(ensure representative sample is taken, sample all fibres)

  • Clear filler material

Glasgow Scientific Services

identification of asbestos1
Identification of Asbestos
  • Examine the slide microscopically – scanning the entire slide – using plane light and polarising any suspicious fibres.
  • Clean-up
    • Return Slides to glass Jar/ bag.
    • Clean the fume cupboard surfaces – vacuum cleaner fitted with suitable filter, wet wipes.
    • Place all material in labelled “asbestos” bag for special disposal.

Glasgow Scientific Services

example of acm board material
Example of ACM Board material

Glasgow Scientific Services

example of acm insulation
Example of ACM - Insulation

Glasgow Scientific Services

example of acm painted board
Example of ACM - Painted board

Glasgow Scientific Services

example of acm asbestos rope
Example of ACM - Asbestos rope

Glasgow Scientific Services

example of acm floor tiles
Example of ACM - Floor tiles

Glasgow Scientific Services

example of acm toilet cistern
Example of ACM - Toilet Cistern

Glasgow Scientific Services

example of acm corrugated roofing
Example of ACM - Corrugated Roofing

Glasgow Scientific Services

example of acm sprayed insulation
Example of ACM - Sprayed Insulation

Glasgow Scientific Services

chrysotile asbestos
Chrysotile Asbestos

Teased out fibres

Fine Wispy

Fibres

Knee bend

Glasgow Scientific Services

chrysotile asbestos1
Chrysotile Asbestos

Fibres glow bright white on polarisation.

Glasgow Scientific Services

amosite asbestos
Amosite Asbestos

Bundles of sharp

tightly packed fibres

Straight rigid fibres

Glasgow Scientific Services

amosite asbestos1
Amosite Asbestos

Polychromatic “rainbow” effect on polarisation

Glasgow Scientific Services

crocidolite asbestos
Crocidolite Asbestos

Fibres not as rigid as Amosite

Fibres

Dark inky

Blue

Wispy fibres

present where

the fibre bundles

are teased out

Glasgow Scientific Services

crocidolite asbestos1
Crocidolite Asbestos

Fibre bundles exhibit a red/brown appearance on polarisation

Glasgow Scientific Services

cotton fibres
Cotton Fibres

Ragged

fibre

ends

Distinct

Cellular

structure

Fibres

twisted

and bent

Often - Polychromatic effect without polarisation

Glasgow Scientific Services

cotton fibres1
Cotton fibres

Polychromatic effect within cellular structure not along fibre

Glasgow Scientific Services

slide28
Hemp

Ragged fibre ends

Cellular structure

Polychromatic effect present with or without polarisation

Glasgow Scientific Services

slide29
Hemp

Ragged

fibre ends

Polychromatic effect present with or without polarisation

Glasgow Scientific Services

slide30
Jute

Distinct cellular structure, ragged fibre ends, polychromatic effect.

Glasgow Scientific Services

glass fibre
Glass fibre

Transparent

Fibre

Ends

truncated

Variable

diameter

No effect on polarisation

Glasgow Scientific Services

polymeric fibre polyester
Polymeric fibre (polyester)

Fibre ends

blunt

Single

filament

Regular

diameter

Bending or

curvature

Glasgow Scientific Services

polymeric fibre polyester1
Polymeric fibre (polyester)

Polychromatic effect

Glasgow Scientific Services