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CMC Asbestos Surveys: Asbestos Glossary - D

Latest Asbestos News

HSL investigation refutes asbestos claims over safe cement

The Health and Safety Laboratory (HSL) have investigated claims that chrysotile in asbestos cement changes into a non-asbestos fibrous material called Casitile. The claims also suggested that this process is 100% efficient and no chrysotile asbestos remains in the matrix and no release of airborne chrysotile fibres can occur.

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Damaged Friable Miscellaneous ACM
Friable miscellaneous ACM which has deteriorated or sustained physical injury such that the internal structure (cohesion) of the material is inadequate or, if applicable, which has delaminated such that its bond to the substrate (adhesion) is inadequate or which for any other reason lacks fiber cohesion or adhesion qualities. Such damage or deterioration may be illustrated by the separation of ACM into layers; separation of ACM from the substrate; flaking, blistering, or crumbling of the ACM surface; water damage; significant or repeated water stains, scrapes, gouges, mars or other signs of physical injury on the ACM. Asbestos debris originating from the ACBM in question may also indicated damage.

Damaged Friable Surfacing ACM
Friable surfacing Asbestos Containing Material which has deteriorated or sustained physical injury such that the internal structure (cohesion) of the  asbestos material is inadequate or which has delaminated such that its bond to the substrate (adhesion) is inadequate, or which, for any other reason, lacks fiber cohesion or adhesion qualities. Such damage or deterioration may be illustrated by the separation of ACM into layers; separation of ACM from the substrate; flaking, blistering,, or crumbling of the ACM surface; water damage; significant or repeat water stains, scrapes, gouges, mares or other signs of physical injury on the ACM. Asbestos debris originating from the ACBM in question may also indicate damage.

Damaged or Significantly Damaged Thermal System Insulation ACM
Thermal system insulation ACM on pipes, boilers, tanks, ducts, and other thermal system insulation equipment where the insulation has lost its structural integrity, or its covering, in whole or in part, is crushed, water stained, gouged, punctured, missing, or not intact such that it is not able to contain fibres. Damage may be further illustrated by occasional punctures, gouges or other signs of physical injury to ACM; occasional water damage on the protective coverings/jackets; or exposed ACM ends or joints. Asbestos debris originating from the ACBM in question may also indicating damage.

Decontamination
A series of connected rooms with polyethylene enclosure system curtained doorways for the purpose of preventing contamination of areas adjacent to the work area.

Decontamination Area
An enclosed area adjacent and connected to the regulated area and consisting of an equipment room, shower area, and clean room, which is used for the decontamination of workers, materials, and equipment contaminated with asbestos.

Decortication
The removal of the constricting layer of abnormal tissue from the surface of the lung

Delami
nate
To separate into layers. In asbestos terms, to separate from the substrate.

Diffuse pleural thickening
The widespread thickening of the pleura as a result of exposure to asbestos

Dirty Area
Any area in which the concentration of airborne asbestos fibres exceeds 0.01 f/cc, or where there is visible asbestos residue.

Dispersion Staining
Used in conjunction with polarized light to identify bulk samples. A particle (fiber) identification technique based on the difference between light dispersion of a particle (fiber) and liquid medium in which it is immersed.

Dyspnoea
Breathlessness, possibly caused by asbestos damage to the lungs

Dyspnoeic
Breathless, possibly due to lung damage caused by asbestos

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