Re: [Killietalk] WEld-on??

[LeeH920226 at aol_com]

In a message dated 4/7/04 1:39:57 PM, cgraseck at optonline_net writes:

<< My experience is that one should never use alcohol of any sort on
acrylic.  >>

Solubility parameters of acrylic (poly methyl methacrylate or PMMA) are 
unusual in water/alcohol mixtures. I did a study once that showed that 100% ethyl 
alcohol was not a good solvent for PMMA, but 90/10 ethyl alcohol/water 
dissolved a significant amount of PMMA. However, at less than about 80% alcohol in 
water mixtures, it was a non solvent. Ternary phase diagrams represent these 
solubility relationships remarkably well. I cannot  remember the exact details but 
the solubility limits looked something like this

                                                    PMMA
                                                        XX
                                                     X       X
                                                  X             X
                                              X                    X
                                          X                           X
                                     X                                    X
                                 X                                            
X
                             X                                       ++       
  X
                        X                                            +++++    
   X
                   X                                                   +++++  
       X
              X                                                           
++++++        X
        X                                                                     
                   X
Water XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Alcohol

More than you ever wanted to know about solubility of PMMA.

Lee Harper
Media, PA

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