Pressboard is an insulating material that is made from cellulose. It is similar to, and often confused with, insulation paper. It is designed for use in heavy electrical applications, where it is laminated and then hot pressed between flat surfaces at high pressure. The end result is a product that is extremely dense, has great mechanical strength, and very stable dielectric characteristics. Pressboard is also a rigid product and is often dimensionally accurate, which makes it ideal for applications such as transformers and switchgear, where it can provide both electrical insulation and mechanical support. It is often chosen for this type of application because of its long life and versatility.
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