Asbestos Gasket
Compressed asbestos-fibre gaskets used to seal flanged joints in piping, boilers, and industrial equipment.
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Description
Asbestos gaskets are sealing components manufactured from compressed asbestos fibre, typically chrysotile, bound with rubber, graphite, or other elastomeric compounds. They were designed to create pressure-tight and heat-resistant seals between flanged joints in piping systems, boiler connections, pump housings, valve bonnets, and heat exchangers. Asbestos content varies from 30 % to 85 % depending on the specific product grade and application.
Asbestos gaskets were the industry standard for sealing applications from the early 1900s through the 1990s, and their use extended well beyond the ban dates in many countries due to existing stock and exemptions for certain industrial applications. They were ubiquitous in oil refineries, chemical plants, power stations, water treatment facilities, breweries, food processing plants, and commercial plumbing systems.
The material is classified as non-friable when intact. A properly installed, undamaged gasket presents a relatively low risk because the asbestos fibres are tightly compressed and bound within the rubber or graphite matrix. However, risk increases substantially during removal, as aged gaskets often adhere to flange faces and must be scraped, chiselled, or wire-brushed off, breaking the matrix and releasing asbestos fibres. Cutting new gaskets from asbestos sheet material also generates significant fibre concentrations.
Despite the relatively low risk when undisturbed, the sheer volume of asbestos gaskets in industrial facilities means they are one of the most frequently encountered ACMs during maintenance and decommissioning work. Plumbers, pipefitters, boilermakers, and maintenance engineers are the occupational groups most commonly exposed.
Modern non-asbestos gasket materials include aramid fibre (Kevlar), PTFE (Teflon), expanded graphite, and various synthetic elastomers. These alternatives meet or exceed the performance of asbestos gaskets in most applications. When replacing gaskets in older equipment, always assume existing gaskets may contain asbestos unless the installation date and material specification confirm otherwise.
Pays où on le trouve couramment
Marques commerciales
Comment l'identifier
Asbestos gaskets appear as flat, compressed rings or shapes, typically grey, brown, or blue-grey in colour. They are found between flanges on pipes, at valve connections, and on boiler access covers. The gasket material feels firm and slightly rubbery. Older gaskets may be hard, brittle, and partially bonded to the flange face. They are difficult to distinguish visually from modern non-asbestos gaskets, so laboratory testing is recommended for any pre-1990 installation.
Risque sanitaire et friabilité
Ce matériau a un niveau de risque de 2 sur 5.
Il est classé comme non-friable, ce qui signifie que les fibres d'amiante sont fermement liées dans la matrice du matériau. En bon état et non perturbé, le risque de libération de fibres est faible. Cependant, couper, percer, poncer ou casser le matériau peut libérer des fibres dangereuses.
Que faire si vous trouvez ce matériau
If gaskets are in place and undisturbed, they present minimal risk. During planned maintenance or equipment decommissioning, have gaskets tested before removal. When removal is necessary, keep the gasket and flange face damp, use hand tools rather than power tools, avoid dry scraping, and collect all debris for disposal as asbestos waste. Use appropriate RPE and disposable overalls.
Questions fréquentes
Are asbestos gaskets still in use?
How dangerous are asbestos gaskets?
What should I use to replace an asbestos gasket?
Do I need a licensed contractor to remove asbestos gaskets?
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