Other fibers are often used as replacements for asbestos. Fibreglas, rock woll and even carbon fibers can be used, depending on the application.
Asbestos provides better insulation, because it is thicker and denser than iron.
Asbestos provides better insulation, because it is thicker and denser than iron.
Some, but not all, forms of insulation used to contain asbestos. Insulation applied new now does not contain asbestos.
Some older soffit boards are constructed from asbestos cement sheets, many types of insulation, if you have an older home with cloth wiring the cloth can contain asbestos as well.
since asbestos was used for very different purposes, its replacement materials are different, depending on the use. For example, calcium silicate replaces asbestos in boiler insulation, but not in brake pads.
Gypsum insulation made prior to the 1970s included asbestos as a means of providing increased physical strength and insulation capacity to the product. Gypsum insulation made after the 1980s generally did not contain asbestos.
The only way to reliably identify asbestos-containing insulation is to have a small sample analysed by a qualified laboratory.
Currently it is illegal to add insulation to a home with more than a very small percentage of asbestos. Exposure to these small quantities of asbestos typically do not cause harm and are considered to be safe. Older homes may have asbestos insulation that needs to be removed as these older forms of insulation do present certain health risks.
Asbestos cement
Yes, some wire insulation has asbestos.
No, masonite does not contain any asbestos.
Rock wool insulation was a substitute for asbestos insulation. You bought one or the other, not both.