Definition
Asbestos-containing material that can be crumbled, pulverized, or reduced to powder by hand pressure when dry. Friable asbestos is considered more dangerous than non-friable asbestos because it can easily release fibers into the air. Examples include pipe insulation, spray-on coatings, and thermal insulation. Requires specialized handling and removal procedures with strict containment protocols.
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Asbestos
A group of naturally occurring fibrous minerals composed of thin, needle-like fibers. Asbestos was widely used in construction and manufacturing due to its heat resistance, strength, and insulating properties. When disturbed, asbestos releases microscopic fibers that can be inhaled, causing serious health problems including lung cancer, mesothelioma, and asbestosis. All types of asbestos are now recognized as carcinogenic.
Asbestos Fibers
Microscopic, thin, elongated particles that make up asbestos minerals. These fibers are typically less than 3 micrometers in diameter and can remain airborne for extended periods. When inhaled, they can penetrate deep into the lungs and remain there for years, potentially causing asbestos-related diseases. Fiber counting and identification is essential for exposure assessment and clearance testing.
ACM (Asbestos-Containing Material)
Any material or product that contains more than 1% asbestos by weight. ACMs were commonly used in over 3,000 different products including insulation, fireproofing, roofing, flooring, and cement products. The identification and management of ACMs is crucial for protecting building occupants and workers from asbestos exposure.