Some, but not all, forms of insulation used to contain asbestos. Insulation applied new now does not contain asbestos.
No, masonite does not contain any asbestos.
Does johns-manville spintex blown insulation contain asbestos
no.
No, not all vermiculite contains asbestos. You should have it tested.
no
It is possible that spun wool insulation manufactured in the 1940s could contain asbestos. Asbestos was commonly used in building materials during that time period, including some types of insulation. It is recommended to have the insulation tested for asbestos before conducting any renovations or other activities that could disturb the material.
Rock wool insulation was a substitute for asbestos insulation. You bought one or the other, not both.
No modern insulation product sold in North America or the European Union contains asbestos.
No. Owens Corning Fiberglas insulation was made with Fiberglas providing the fibrous functions in place of asbestos.
Vermiculite insulation may contain asbestos which is known to lead to cancer and breathing related problem do to breathing in the asbestos which will attack lungs.
Mineral wool is made from melted rock and did not contain asbestos. It was a less effective, but less costly, alternative to asbestos containing products.