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.
No, asbestos was not used in drywall. Drywall is typically made of gypsum and paper, not asbestos.
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 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.
Stop smoking (if you smoke), and avoid exposure to chemicals and asbestos.
Asbestos (particularly blue asbestos)
Insulation used to contain asbestos, but modern insulation materials do not contain asbestos.
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.
Asbestos has high tensile strength and flexibility, allowing it to be woven into fabric or compressed into sheets, making it a good insulator. Its fibrous nature traps air pockets, which provides thermal insulation. Additionally, asbestos is resistant to fire, chemicals, and electricity, which enhances its insulating properties.
The most commonly used type of asbestos in building products is chrysotile, also known as white asbestos. Chrysotile accounted for the majority of asbestos used in construction materials, including insulation, roofing, and flooring. Other asbestos types, like amosite (brown asbestos) and crocidolite (blue asbestos), were used less frequently. However, due to health risks associated with asbestos exposure, its use has been heavily regulated or banned in many countries.