(1) Pearl cotton can be used as indoor thermal insulation in theory, but it can't be used in practice and has no strength.
(2) Rock wool is generally used for outdoor thermal insulation.
Judging from the material of rock wool board, it is made of basalt after processing. In order to achieve better thermal insulation effect, various additives, such as binder, dustproof agent, waterproof agent, etc., need to be added in the processing process, and then they are mixed, heated and cured to form the rock wool board we use.
If the construction personnel do not handle the rock wool board properly during the installation, it may cause discomfort. Generally, the exposed rock wool fibers of rock wool board may enter the human body, causing pneumoconiosis. Therefore, don't touch the rock wool boards piled on the ground during construction. Secondly, the rock wool fiber produced by the rock wool board on the outer wall will also irritate the skin. We should pay attention to this point, which will also occur when installing indoors, so it is suitable for installing on the outer wall.