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.
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
Toothpaste is manufactured by mixing fluoride, whiteners, sweeteners, preservatives, abrasives and benders together and packing into a plastic tubing. There are many different kinds of toothpaste. www.ask.com
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