Asbestos Learning Tool
description
Transcript of Asbestos Learning Tool
The Hidden Killer
Asbestos
Learning Outcomes
1. Demonstrate understanding of the dangers associated with asbestos
2. Recall the 3 different sources of asbestos
3. Identify where asbestos can be found in day to day use
Asbestos – a brief overview
The Hidden Killer!
First task – 5 minutes
• On the piece of paper in front of you, I want you to think of the following questions and write your response – for all to see:
1. What does asbestos mean to you?2. Can you state an example of
asbestos that you have seen?
What is Asbestos?
• Asbestos is a term given to a number of naturally occurring mineral fibres which have been exploited commercially for their useful properties.
• Asbestos is mined throughout the world - South Africa, Australia, Canada
• 3 most common types:– Amosite (brown)– Crocidolite (blue)– Chrysotile (white)
Asbestos Fibres
Chrysotile fibre bundle (image 600 x magnification) exposed on the surface of a weathered cement sheet.
Individual amosite fibres
Amosite fibre bundle (image 2000 x magnification)
Asbestos Useful Properties
• High tensile strength• Chemical resistance• Good thermal insulation• Incombustible• Flexible - can be woven• Can be mixed with cement and
plastic and retain its properties
History of Asbestos Use in UK
• First imported ~1880s• Main period of use 1950 – 1980• 1973 - Voluntary industry ban on
spraying of asbestos• 1985 – Supply of amosite and
crocidolite prohibited• 1999 - Use of all forms of chrysotile
prohibited
Advert from New Scientist
June 1957
Application of sprayed asbestos coating c1950-
1960
Asbestos Related Disease
• Pleural Plaques• Asbestosis
– Fibrosis/scarring of lung– Dose related (mod-high) and progressive
• Lung Cancer• Mesothelioma
– Specific cancer of inner lining of chest wall or abdominal cavity
– Nearly always fatal
Onset can range from 10 – 60 years after first exposure to asbestos.
What this means in ‘real terms’
• YouTube - Ian Wright's Asbestos Warning
Group activity – 5 minutes
• In groups, discuss the video and facts on the use of asbestos.
• What have you learnt that has highlighted the dangers of asbestos?
• Note your findings down on the flipchart paper and choose a person to feedback
Asbestos Exposure - Past and Present
• Manufacture of asbestos products.• Installation of asbestos products.
• Removal of asbestos containing materials (ACMs) without suitable controls.
• Inadvertent disturbance of ACMs during maintenance activities.
Past Exposure
Present Exposure
Release of Fibres from ACMs: Friability
• Loose-fill lagging
• Lagging
• Sprayed insulation
• Asbestos insulation board
• Asbestos cement
• Floor tiles
MOST FRIABLE
LEAST FRIABLE
Good Control v Poor Control
Typical Exposure LevelsTechnique
Typical Exposure
f/mlComments
Controlled wet stripping of lagging and sprayed coating
Up to 1Thorough soaking of the lagging with a wetting agent followed by careful removal
Uncontrolled dry stripping of lagging 1-100 Stripping dry or where dry
patches are encountered
Careful removal of whole AIB boards Up to 3
Unscrewing (with shadow vacuuming with the spray application of a wetting agent on unsealed surfaces)
Breaking and ripping out AIB 5-20 Carried out dry with no
unscrewing
HSE Control Limit 0.1 Averaged over a period of 4 hours.
Real life account
• The Hidden Killer - Christopher Morgan's Story
Group activity – 5 minutes
• I’m sure you will agree that what you have just seen was a very ‘moving’ video, with some very clear messages.
• Discuss what important message you will take away with you today?
• Nominate a person in your group to feed back.
Asbestos insulating board used as a
ceiling board for fire resistance, plumber
wasn’t informed/aware
when he fixed the leak
Loose infill under floorboards exposed during central heating installation – Refurbishment survey not completed
Non licensable ACMs
• Asbestos cement• Textured coatings• Composite materials
Asbestos Essentials for Non Licensed Tasks
Licensable ACMs
• Asbestos Insulating Board• Sprayed coatings• Lagging
Individual Task
• Complete the task sheet –‘The hunt for asbestos’
• Consider the areas listed and the ‘bubbles’ on the house picture – where are ACM’s situated?
• Good luck!
Learning Outcomes
1. Demonstrate understanding of the dangers associated with asbestos
2. Recall the 3 different types of asbestos
3. Identify where asbestos can be found in day to day use