This International Standard specifies a method of determining an apparent viscosity, by the Brookfield Test method, of resins in a liquid or similar state, using one of the types of rotational viscometer described in this Standard. The application of this method to specific products is detailed in annex A. The viscometers, types A, B and C, permit viscosity measurements from 0,02 Pa·s (20 cP) to 60 000 Pa·s (60 × 106 cP).