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CMC Asbestos Surveys: Asbestos Glossary - M

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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Make-up Air
Supplied or recirculated air to offset the air that has already been exhausted from an area.

Malfunction
Any sudden and unavoidable failure of air pollution control equipment or process equipment or of a process to operate in a normal or usual manner so that emissions of asbestos are increased. Failures of equipment shall not be considered malfunctions if they are caused in any way by poor maintenance, careless operation, or any other preventable upset conditions, equipment breakdown, or process failure.

Manufacturing
The combining of commercial asbestos, or in the case of woven friction products, the combining of textiles containing commercial asbestos-with any other material(s), including commercial asbestos, and the processing of this combination into a product. Chlorine production is considered a part of manufacturing. 

MCEF
Mixed Cellulose Ester Filter. One of several different types of media used to collect asbestos air samples.

MDHS 100
Method for the Determination of Hazardous Substances - Surveying, sampling and assessment of asbestos-containing materials. This is guidance issued by the HSE to ensure proper practice and conformity in the surveying and reporting of ACM.

Mesothelial Cells
Cells of the pleura. These produce the fluid that usually fills the gap between the parietal and visceral layers of pleura. These cells sometimes become cancerous producing the condition 'Mesothelioma'

Mesothelioma
A rare cancer, usually found in those exposed to asbestos, in the form of a malignant tumor in the mesothelium of the lungs and or abdomen. Symptoms of this incurable disease are persistent coughing or coughing of blood, chest or abdomen pain, fatigue, and weight loss. The time between exposure to asbestos and onset of the disease is between 15 and 60 years.

Mesothelium
The tissue that forms a lining around the chest, abdominal cavity and other organs. This tissue produces a lubricant fluid that protects organs and allows them to move.

Metaplasia
Abnormal cell structure not quite reaching the level required to allow classification of the cell as malignant.

Method Statement
The method by which the Licensed Removal Contractor will remove and dispose of the ACMs.

Mesothelial Cells
Cells of the pleura. These produce the fluid that usually fills the gap between the parietal and visceral layers of pleura. These cells sometimes become cancerous producing the condition 'Mesothelioma'

Mesothelioma
A rare cancer, usually found in those exposed to asbestos, in the form of a malignant tumor in the mesothelium of the lungs and or abdomen. Symptoms of this incurable disease are persistent coughing or coughing of blood, chest or abdomen pain, fatigue, and weight loss. The time between exposure to asbestos and onset of the disease is between 15 and 60 years.

Mesothelium
The tissue that forms a lining around the chest, abdominal cavity and other organs. This tissue produces a lubricant fluid that protects organs and allows them to move.

Mineral Wool
A commonly used substitute for asbestos.

Miscellaneous ACM
Miscellaneous material that is an 'asbestos containing material' in a building.

Miscellaneous Material
Interior building material on structural components, structural members or fixtures, such as floor and ceiling tiles, and does not include surfacing material or thermal system insulation.

MSDS
Material Safety Data Sheet

Mucosa
The inner lining of a hollow organ, for example the inner lining of the bronchus

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