Yes West Systems 105-205/206 epoxy relies on stoichiometric reaction... 

Quoting Ben Diss <[EMAIL PROTECTED]>:

> I wonder if West Systems is the same way?  I know the mix ratio is critical.
> 
> 
> 
> dharban wrote:
> 
> >I have used this stuff and it is great.  A word of warning, however, the
> >mixing ratio on this stuff is more critical than most of the epoxies you
> >are used to working with.  The first batch I mixed did not set up --
> >ever!!
> >
> >I visited with ACP and they referred me to their supplier and I learned
> >that this epoxy depends on a stoichiometric reaction rather than a
> >catalytic reaction.  That means the respective amounts of parts A and B
> >react completely with each other and if the ratio is off by very much
> >unreacted component will remain in the mix for the part which is in
> >excess of the required ratio.  Most epoxies we work with have a more or
> >less catalytic reaction which means that you have more leeway on the
> >ratio of hardener to resin.
> >
> >Having had to clean up after a batch that did not "go off" I would
> >strongly recommend taking pains to 1) get the ratio right and 2)
> >thoroughly mix the components.
> >
> >
> >  
> >
> 
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Radius Systems
Cogito Ergo Zoom

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