Rapid Prototyping involved creating a working model of various parts of the system at a very early stage, after a relatively short investigation. The method used in building it is usually quite informal, the most important factor being the speed with which the model is provided.
There are water-and solvent-based -- also called oil-based -- polyurethane varnishes. Water-based polyurethanes are more environmentally friendly and safer to use than solvent-based, but they are not as resistant to wear and tear as solvent-based products.
Aromatic Solvent Definition - What does Aromatic Solvent mean? An aromatic solvent is a solvent that contains an aromatic hydrocarbon such as naptha, toluene or xylene. Aromatic solvents are primarily used as solvents and diluents in various industrial fields. Aromatic solvents such as toluene are commonly used in paints, varnishes, adhesives and as chemical intermediates.