This International Standard specifies a method for the measurement of the static angle of repose of solid fertilizers. The method is applicable to free flowing fertilizers and is suitable for measuring static angles of repose greater than 20°; the method is not suitable for materials which contain a large Proportion of particles exceeding 5 mm in diameter. NOTE - The measurement of the static angle of repose is of importante for the calculation of storage capacities. The angle measured according to this method is normally the maximum value resulting in practice. For the determination of the dynamic angle of repose (angle of slide) other methods (e.g. a tilting box method) are available.