Dyn-A-Dish Weighing Boats by Dyn-A-Med are disposable and lightweight with a stable, flat bottom and turned, non-slip gripping edge. These weigh dishes are easier to manipulate than unwieldy papers or heavy glass or porcelain labware. Thin, no-wetting, polystyrene is unaffected by inorganic solutions and is ideal for handling dry or liquid samples.They are flexible and can be squeezed for controlled pour off. Polystyrene.