Ah, the expert confirmation of what my aging memory had conjectured... It seems to me that at one time ads touted their products of made from "virgin plastic." And the cynical have always had something to say about recycled virgins.
Jace Kahn General Manager Ceres & Canisteo RR Co./Champlain County Traction Co. > --- In [email protected], JGG KahnSr <jacekahn@...> wrote: > > > Perhaps some chemist or chemical engineer on the list can provide an expert > > answer, but my understanding is that > > the molecules change under heat and the process is not entirely > > reversible--something about the polymers?--so > > that too much recycling results in imperfect integration of them. I do > > know over the years I've come across plastic > > parts that were either lumpy or unusually brittle. > > hey jace, plastics are polymers, the same molecule arranged in a very long > chain, like 10,000. heat and pressure breaks the chains down which ruins the > good properties, so they can only be recyled once or twice without becoming > weak/brittle. dale, veteran of 33 years in the plastics industry. [Non-text portions of this message have been removed] ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
