What is so important about asbestos-cement?

Myths and Facts about Asbestos-Cement

Over 95% of the chrysotile asbestos fiber mined worldwide is mixed with cement to form roofing, siding, pipes and many more products. These products have been used for decades throughout the world, but due to bans on their use in many countries they are now marketed primarily in developing countries. The following table shows where chrysotile asbestos fiber is currently mined and where it is consumed to be turned into products and installed. Note that the producing countries are not necessarily the users of the fiber they mine.

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Myths and Facts about Asbestos-Cement

Is this what we call “Transite?”
Not entirely. Transite is a trade name for Johns-Manville asbestos-cement products made to specific formulations. For example, a line of Transite electrical ducts had 15 to 25% chrysotile asbestos, 45 to 55% Portland cement and 25 to 35% silica flour. I have seen a lot of asbestos-cement products in the US without the name “Transite,” not surprising since CertainTeed, National Gypsum, GAF Corporation, Celotex, Nicolet and others also produced it. I have never seen the name “Transite” used in connection with asbestos-cement products outside the US, where major producers included Eternit, Saint Gobain and James Hardie.

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