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Asbestos Insulating Board
Location / Use: Used for fire protection, thermal and acoustic insulation, resistance to moisture movement and general building board. Found in service ducts, firebreaks, infill panels, partitions and ceilings (including ceiling tiles), roof underlay, wall linings, external canopies and porch linings.
Asbestos Content and Type / Date Last Used: Crocidolite (blue) asbestos used for some boards up to 1965, amosite (brown) asbestos up to 1980, when manufacture ceased. Usually 15-25% amosite (brown) asbestos, or a mixture of amosite and chrysotile (white) asbestos in calcium silicate. Older boards and some marine boards contain up to 40% asbestos.
Ease of Fibre Release and Product Names: Asbestos insulating board can be readily broken, giving significant fibre release. Also significant surface release is possible by abrasion, but surface is usually painted or plastered. Sawing and drilling will also give significant releases. Names: Asbestolux, Turnasbestos, LDR, asbestos wallboard, insulation board, marine board, Marinite and Shipboard.
Asbestos Mill Board (‘Millboard’)
Location / Use: Millboard was used for general heat insulation and fire protection. Also used for insulation of electrical equipment and plant.
Asbestos Content and Type / Date Last Used: Crocidolite (blue) asbestos was used in some millboard manufacture between 1896 and 1965; usually chrysotile (white) asbestos. Millboards may contain 37-97% asbestos, with a matrix of clay and starch.
Ease of Fibre Release and Product Names: Asbestos ‘Millboard’ has a high asbestos content and low density so it is quite easy to break the surface and is subject to abrasion and wear.