I am looking for information on the basic sources for epoxy resins. I 
read that about 75% of US epoxy resins are manufactured by Shell, Dow 
and Ciba-Geigy. Are these petro based? I understand that some resins are 
derived from wood pulp. How do these differ? More "flexible"? 
Manufacturers make various claims, and I am having trouble sorting out 
what is what.
Jim

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