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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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Most foam is made from polyurethane. They start by making polyurethane. To make it, you mix a polyol with a diisocyanate. There are many polyols. There are two important isocyanates, toluene diisocyanate and methylene diisocyanate. (Two other  wiki.answers.com
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