Sorry for re-posting this with a new subject line guys, but I haven't gotten 
any answers.  I'm sure that with all the collected brainpower and experience in 
this group, someone can help me to answer this.

I've read quite a number of things referring to deterioration of rubber and 
certain plastics by biodiesel.  How serious is this problem really?

I understand that methyl ester is a pretty good solvent.  I know that methanol 
is a really good solvent.  In Aleks Kac's "Foolproof method," section on 
methanol recovery, he says that you can remove at least one quarter of all the 
methanol used.  Over 50ml of methanol per litre of oil remains unreacted in 
solution.

My questions are:

1)  Is this much unreacted methanol present in the other biodiesel recipe's or 
is this unique to Aleks'  "foolproof" one.?

2)  Is it mainly the methanol which causes the deterioration of rubber and 
plastics, or is the methyl ester equally or more to blame.  (will a good 
methanol recovery system help signifigantly to save rubber etc.?)

Obviously this problem isn't critical, because plenty of you folks have driven 
thousands of miles on the stuff, but I'd like to understand this aspect a 
little better.

Thanks, 

Dave.



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