Non-woven fiber consists of various types of fibers such as fiberglass, mineral wool, cellulose, and plastic fiber. Fiberglass material is composed of very fine glass fibers made from molten glass which are spun or blown into fiber materials with different densities and temperature resistance values. Fiberglass material is generally available in the form of rolls or loose-fills, which makes it suitable for acoustic and thermal insulation usage in parts of a vehicle with limited space or accessibility. Another type of non-woven polyester is mineral wool, which is made from natural minerals, minerals left by molten metal, and other industrial recycled content. Mineral wool is also available in rolls or loose-fills. 

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Another type of non-woven polyester is cellulose, which is made from recycled paper products. The paper bits are cut, fiberized, added with mineral borate, and packed into cavities and spaces in a vehicle for insulation. Plastic fiber is also a form of fiber insulation, where recycled PET materials are made into fibers and pressed into batt insulation. Some of the major manufacturers of non-woven polyester fibers for electric vehicle insulation are Pyrotek, Kumtek, and Isover Saint Gobain.

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There exists a general perception that as electric vehicles have less parts due to the elimination of components, such as internal combustion engine, gearbox, ignition system, and tailpipe, therefore the need for acoustic and thermal insulation would be less in such vehicles. On the contrary, there are some new parts and focus areas in an electric vehicle, where additional insulation would be required to provide a seamless and comfortable driving experience. As compared to traditional IC engine vehicles, sound and vibration levels inside the cabin are notably lower for electric vehicles.

However, vehicle sounds such as tonal noise caused by electromagnetic forces in the motor and audible sound feedback from tires and axle while driving are more profound, as these are not masked by the combustion engine noise anymore. Moreover, the battery of an electric vehicle is often vulnerable to extreme weathers, making thermal insulation a pertinent need for electric vehicles. Due to such situations, acoustic and thermal insulation applications had to be enhanced in several key areas of an electric vehicle such as the passenger compartment, rear compartment, under the hood, and exterior of the vehicle.

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