Building insulation materials is used depends on a wide variety of factors. Some insulation materials have health risks, some so significant the materials are no longer allowed to be used but remain in use in some older buildings such as asbestos fibers and urea. Factors affecting the type and amount of insulation to use in a building include: Considerations regarding building and climate: Often a combination of materials is used to achieve an optimum solution and there are products which combine different types of insulation into a single form. Spray foam is a type of insulation that is sprayed in place through a
Electrical insulation paper insulation paper. Electrical insulation papers are made from well delignified unbleached kraft pulp. Electrical cables are categorized by the voltage and current used. Telephone cables have moderate voltage and current associated with cables leading moderate electric current or transmitting electrical signals. The telephone cables have a large number of conductors that are individually insulated. In order to not become excessively thick the paper needs to be thin (30-40 g/m). A normal power cable needs more insulation and therefore paper with higher paper density is used, normally 60-190 g/m. The paper needs to be strong, elastic, uniform and free of holes