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How is foam manufactured?

Foams are manufactured by the form of gas bubbles in a plastic mixture, with the use of a blowing agent. Foam creation is either a process that is continuous for creating laminate or slab stock or a batch process for making various shapes by cutting or moulding.
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Visco-elastic memory foam makers treat their manufacturing processes as trade secrets, so only a general description of foam manufacturing is possible. According to the chemical company BASF, the process starts with polyurethane plastic, to which the  www.ehow.com
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1. Mark the cut you want to make using a ruler and marker pen or pencil. If even edges are important, mark the cut on both sides of the foam. 2. Secure the sheet of foam. This may be as simple as holding it down with your free hand or it may require  www.ehow.com

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