Asbestos is a naturally occurring mineral, it is formed from:
White asbestos (Chrysotile) Mg3(Si2O5)(OH)4,
Brown Asbestos (Amosite/Grunerite), Fe7Si8O22(OH)2
Blue Asbestos (Crocidolite), Na2(Fe,Mg)5Si8O22(OH)2
No, coal tar contains many chemicals that are hazardous in a variety of ways, but it does not contain asbestos unless someone intentionally mixed asbestos into it.
PCBs (polychlorinated biphenyls) are organic chemicals, usually liquid in form. Asbestos is a mineral (a rock). The two are completely different.
Asbestos is not banned, but its uses are limited. If you used asbestos in the 1960s then you used the thing that is still called asbestos.
Asbestos, from the brakes and clutches.
Asbestos was used in the making of refridgerators and fridges
Asbestos (particularly blue asbestos)
Stop smoking (if you smoke), and avoid exposure to chemicals and asbestos.
Asbestos Abatement is the term used when referring to the removal, renovation, repairing, or enclosing of asbestos or any such activity that involves renovating asbestos containing materials.
Asbestos was used in the past because it had useful properties and its hazards were not widely understood. Its useful properties included the fact that it could be woven into cloth like cotton or wool, but it would not burn, or it could be used to make filters. It was a good insulator against heat and it was not attacked by, nor did it react with, most chemicals.
While all matter is made up of chemicals, a more useful classification is to recognize that asbestos is a mineral, rather than to call it a chemical.
Asbestos was beginning to be widely used at this time, and is known to be a cancer causing material. Below is an excerpt from the National Cancer Institute, Asbestos has been mined and used commercially in North America since the late 1800s. Its use increased greatly during World War II
Asbestos is not used in today's modern technologies. Currently, most of the Western and Developed world have banned all uses of Asbestos.