There are a number of standard products that plumbers use on a routine basis. Many of these products contained asbestos which increased their risk of exposure to asbestos dust and on the job for developing pleural mesothelioma later on in life. Provided below is a representative cross-section of products that plumbers typically used that may have contained asbestos.
Aircell - corrugated asbestos paper, looks comparably like gray cardboard (Trade names: Asbestocel and Carcycel, among others). This product is usually high in concentration, anywhere between 50 - 90% asbestos. It was also wrapped around air supply ducts.
Block Insulation - a combination of asbestos with other binders that was then hardened to create blocks for insulation. The outside surface was commonly covered with cloth made from canvas or tar paper, but it was occasionally used without any covering at all.
The following are types of block insulation commonly used by plumbers:
Amosite Sheeting: amosite (a type of asbestos) that was processed and covered with felt that was mainly used for pipe insulation.
Carbonate of Magnesia: asbestos combined with magnesium carbonate.
Diatomaceous Earth with Asbestos Fiber: a combination of diatomaceous silica (the remains of microscopic diatoms) and asbestos fiber that could withstand temperatures up to 1900° Fahrenheit.
Hydrous Calcium Silicate: known as 'Calsil', made primarily of lime and silica but with a small amount of asbestos that was included for mechanical purposes.
Joint/Elbow Fillers: also called 'insulation cement' or 'insulation mud' made up of asbestos combined with bonding clays. This product was often poured into inaccessible spaces or used to seal pipe joints or elbows.
Laminated Asbestos Felt: known as 'asbestos sponge felt', made with asbestos and magnesia.
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