What are the two active ingredients in Expanding foam for home insulation?

Question

Polyeurathane expanding foam or whatever foam it is thats used as insulation in homes...

Its also used to make surfboards and boats...

I would really like to know more about this stuff... but i want to know what chemicals they are...

theres 2 main ingredients

here is an example of what im talking about

http://cgi.ebay.com/Urethane-Pour-Foam-Liquid-for-Flotation-Insulation_W0QQitemZ330251097999QQihZ014QQcategoryZ36123QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Whats in those two buckets?

Answer 1

In all my years of experience, I can confidently advise you that one bucket contains "part A" and the other bucket contains "part B".  "Part B" is usually the catalyst.  

Each company has their own formula, and the components are not interchangeable.

I think "part A" is a derivative of Diet Coke, and "part B" is a derivative of Mentos.