A syndet bar is a classic piece of hard soap. When made with modern
synthetic detergents, it possesses several advantages. Firstly, the
performance in highly alkaline water or in water of poor quality, is
greatly improved. Secondly it is durable and economical, well suited for use in all sorts of manual cleaning.
Unger produces Thonyl, a synthetic surfactant in powder form. Thonyl is
well suited for the making of universal soap bars, either by extrusion