Glossary

PU

Other descriptions are PU lacquer or DD lacquer (named after the brand name of the first binder for hardener land lacquer resin: Desmodur/Desmophen). The ‘PU’ abbreviation stands for the description of the ‘plastic’ created when the substance hardens: polyurethane.

PU lacquers, like NC lacquers, are universally usable on all surface materials. Nevertheless, the difference consists here in that a two-component system. This means that, after the precise addition of a specified quantity of hardener, the lacquer-hardener mixture will only remain ready-for-use for a certain time period without sacrificing quality (= processing time). The chemical reaction then changes the mixture so completely that it can no longer be processed without modifications. (The period of time from mixing the lacquer-hardener batch to this point is called the potlife.) Depending on the type of lacquer system used, the solids content is between about 20% and 70%. This is still a relatively high solvent content.

PU lacquers are first dried physically by flashing-off the solvent and then chemically by polyaddition between resin and polycyonate without splitting-off by-products. The dried and hardened lacquer film is solvent-fast and resistant to a number of chemical and mechanical influences.

As a result, PU lacquers are suitable for heavily used surfaces such as kitchen, bathroom and office furniture as well as table tops.

 

 

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