This part of ISO 14680 is one of a series of standards dealing with the sampling and testing of paints, varnishes and related products. It specifies a method for determining the pigment content of paints in which the solids are sedimented by centrifugation. It is primarily intended for checking the composition during the production of coating materials and as an acceptance check for the coating material user. Difficulties may be encountered when the method is applied to coating materials containing dyestuffs, carbon black, very finely divided silicon dioxide or very finely divided titanium dioxide. It may not be suitable for emulsion paints. The pigment content of coating materials can also be determined by an ashing method (see ISO 14680-2) or by a filtration method (see ISO 14680-3).