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: What does asbestos mean to you? 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. Amosite fibre bundle (image 2000 x magnification) Individual amosite fibres
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 ControlTypical Exposure Levels
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