how is Polyurethane foam made?

could you send me a link

Chemicals are added to produce gas in the mix used to make the polyurethane – Many ways http://en.wikipedia.org/wiki/Polyurethane

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One Response to how is Polyurethane foam made?

  1. mike1942f says:

    Chemicals are added to produce gas in the mix used to make the polyurethane – Many ways http://en.wikipedia.org/wiki/Polyurethane
    References :