AL Asbestos Abatement key terms

Any material or product that contains more than one percent asbestos by weight, as determined by an accredited laboratory using polarized light microscopy. Regulated work practices apply whenever ACM is disturbed.

Material assumed to contain asbestos until sampling and laboratory analysis prove otherwise. Thermal system insulation and surfacing materials in buildings built before the cutoff year are presumed to be ACM.

ACM that is friable, or that becomes friable when handled, and therefore triggers full worker protection and emission-control requirements during demolition or renovation. Non-friable material can become regulated once damaged.

Describes material that can be crumbled, pulverized, or reduced to powder by hand pressure when dry. Friability determines how easily fibers are released and how strictly the material must be handled.

Describes asbestos material that cannot be crumbled or powdered by ordinary hand pressure. It may still release fibers if cut, sanded, ground, or broken, so care is required during removal.

Nonfriable asbestos material such as packings, gaskets, resilient floor coverings, and asphalt roofing products that normally contain more than one percent asbestos. Special handling applies if it becomes crumbled or pulverized.

Nonfriable asbestos material other than Category I, including some cement products and transite. It becomes regulated if it is likely to be crumbled, pulverized, or reduced to powder during demolition or renovation.

Any measure taken to control or remove asbestos fibers, including removal, encapsulation, enclosure, and repair. Each method has its own procedures, and removal is the only method that permanently eliminates the hazard.

Applying a sealant to asbestos material so fibers are bound and cannot become airborne. The material remains in place, so the surface must not be disturbed and must be inspected periodically.

Building an airtight barrier around asbestos material so the material is isolated from occupied space. The asbestos remains in place behind the barrier, and the enclosure must be labeled and maintained.

A condition in which air pressure inside a containment is kept lower than in adjacent areas, so air leaks inward rather than outward. Exhaust fans with HEPA filtration maintain this pressure and keep fibers from escaping.

A sealed enclosure, often built of plastic sheeting and sometimes rigid framing, that isolates the work area. It prevents asbestos fibers from migrating to occupied spaces during abatement.

Any containment element, such as plastic sheeting, doors, or duct seals, whose failure would allow fibers to escape. Workers must not cut, breach, or remove a critical barrier without authorization.

A sequence of connected rooms, typically clean room, shower, and equipment room, that workers pass through when entering and leaving a regulated work area. It prevents fibers from being carried out on clothing or skin.

The uncontaminated end of a decontamination unit where clean clothing and street clothes are kept. Workers enter and exit the work area only through the full decontamination sequence.

Techniques that soak or mist asbestos material with amended water before and during disturbance to suppress fiber release. The material must stay wet until packaged and removed.

Water mixed with a surfactant that lowers surface tension so it penetrates asbestos material more effectively. Wetting with amended water reduces airborne fiber concentrations during removal work.

A wetting agent added to water to help it soak into asbestos material rather than bead on the surface. It improves fiber suppression but does not eliminate the need for other controls.

A sealed plastic bag with built-in gloves that lets a worker handle small amounts of asbestos, such as pipe insulation, without dispersing fibers. It is used for limited, localized removal rather than large-scale abatement.

A small, sealed containment built around a localized work area, such as a valve or short pipe section. It provides negative pressure and decontamination for jobs too small to justify a full containment.

A high-efficiency particulate air filter rated to remove at least 99.97 percent of particles 0.3 micrometers in diameter. It is required on vacuums and exhaust units used in asbestos work.

A vacuum equipped with a HEPA filter and used for cleaning dust and debris in asbestos work areas. Ordinary shop vacuums are prohibited because they exhaust fine fibers back into the air.

Placing removed asbestos debris in leak-tight, labeled containers, often sealed plastic bags or drums, before transport. Containers must be wetted contents, sealed, and marked with required warning labels.

The National Emission Standards for Hazardous Air Pollutants, the federal rules under the Clean Air Act that govern asbestos emissions from demolition and renovation. It sets notification, handling, and waste-disposal requirements.

A written notice submitted to the appropriate air pollution control agency before renovation work that will disturb a threshold amount of regulated asbestos material. It identifies the site, owner, contractor, and work schedule.

A notice filed with the air pollution control agency before demolishing a facility, even if no asbestos is present. It allows regulators to verify that asbestos was removed before the structure is destroyed.

The quantity of regulated asbestos material that triggers notification and special handling, commonly expressed in linear feet of pipe or square feet of surfacing material. Work below the threshold may still require safe practices.

A person trained and certified to identify and sample suspect asbestos material and to assess its condition. Only accredited individuals may collect bulk samples for compliance purposes.

A federal law requiring schools to inspect for asbestos, prepare management plans, and use accredited personnel for inspection and abatement. Its accreditation model is widely adopted by state certification programs.

A worker who has completed an approved training course and holds current certification to perform asbestos abatement. Certification typically requires refresher training at set intervals and may be required by the state.

A certified person responsible for directing abatement work, enforcing work practices, and ensuring containment and worker protection. The supervisor oversees the crew and confirms that required procedures are followed.

A person capable of identifying asbestos hazards and authorized to take corrective action to eliminate them. This role is central to construction safety standards for asbestos-related work.

A required marking on asbestos products, containers, and waste that warns of the hazard and advises against disturbing the material. Labels must remain legible on packaged waste until final disposal.

The practice of informing workers about asbestos hazards through labels, safety data sheets, and training. Employers must ensure workers understand the risks and the controls required before work begins.

A chronic lung disease caused by inhaling asbestos fibers, marked by scarring of lung tissue and progressive shortness of breath. It typically develops after years of cumulative exposure and is not reversible.

A rare cancer of the thin lining around the lungs or abdomen, strongly linked to asbestos exposure. It can appear decades after exposure and is generally fatal.

The long delay, often twenty to forty years or more, between asbestos exposure and the appearance of disease. It explains why health effects may emerge long after work has ended.

A device worn over the face to filter airborne asbestos fibers and protect the wearer's breathing zone. Selection depends on exposure level, and fit testing and medical clearance are required.

A procedure that verifies a tight-fitting respirator seals properly against the wearer's face. It must be performed before initial use and repeated at required intervals.

Clothing and gear, such as disposable coveralls, gloves, and respirators, worn to keep asbestos fibers off the body. PPE must be removed and disposed of properly before leaving the work area.

The process of cleaning the body and removing contaminated clothing before leaving the work area, usually through showering in the decontamination unit. It prevents fibers from being carried home to family members.

Measuring airborne asbestos concentrations in the breathing zone to determine worker exposure and the adequacy of controls. Results guide respirator selection and may trigger additional engineering controls.

An air sample collected with a pump and filter worn by a worker in the breathing zone. Laboratory analysis of the filter estimates the worker's actual exposure over the sampling period.

An air sample collected from a fixed location to evaluate fiber levels in a space, such as inside a containment or a clean room. It is used to verify that controls are working and that clearance has been achieved.

Air sampling performed after abatement and cleaning to confirm that fiber levels are low enough for the containment to be removed. Failure requires additional cleaning and re-sampling.

A clearance method that deliberately stirs the air, for example with fans or by brushing surfaces, before sampling. It is intended to detect fibers that could be released during normal occupancy.

A laboratory method that counts fibers on air sample filters but cannot distinguish asbestos from other fibers. It is the standard method for exposure monitoring and clearance air samples.

A laboratory technique that identifies asbestos types in bulk samples by their optical properties. It is commonly used to determine whether material contains more than one percent asbestos.

A physical piece of suspect material collected for laboratory analysis to determine asbestos content and type. Proper sampling technique and chain of custody are needed for valid results.

The maximum allowable airborne asbestos concentration for an eight-hour work shift, set by workplace safety regulations. Exposures above the PEL require stricter controls and higher levels of respiratory protection.

A short-term ceiling on airborne asbestos exposure measured over a brief sampling period, typically thirty minutes. It caps peak exposures even when the eight-hour average is within the permissible limit.

A documented record tracking each sample from collection through transport to laboratory analysis. It preserves sample integrity and supports the reliability of results used for compliance decisions.