What is the difference between a Dispensette III and a Dispensette Organic?
The Dispensette Organic has much in common with a Dispensette III, however there are two major differences. The Dispensette Organic has a glass piston, rather than a PFA-coated piston. This optimizes it for use with concentrated acids and organic solvents that can interact with the PFA, but makes it less useful for bases. In addition, the valve spring was changed in the Dispensette Organic to tantalum (from platinum-iridium alloy) to allow it to be used with peroxides, again, at the expense of compatibility with bases. Because of the different construction and chemical compatibility, parts from a Dispensette III should not be used with a Dispensette Organic, and vice versa.
