BS EN ISO 2431:2019 pdf download – Paints and varnishes – Determination of flow time by use of flow cups (ISO 2431:2019) This document specifies a method for determining the flow time of paints, varnishes and related products that can be used to control consistency. Four flow cups of similar dimensions, but having orifice diameters of 3 mm, 4 mm, 5 mm and 6 mm, are specified. Two methods for checking the flow cups for wear and tear are given (see Annex A). Flow cups with a replaceable jet are not covered by this document as the close tolerances on the supply of the material under test to the jet are not met. Commonly used dipping flow cups are also not covered by this document. NOTE Since the fabrication tolerances for such flow cups are greater than those of the flow cups specified in this document, flow time determinations with dipping flow cups give a precision which is lower than that obtained with the flow cups specified in this document (see Clause 9). The method described in this document is limited to testing materials for which the breakpoint of the flow from the orifice of the flow cup can be determined with certainty. This point is difficult to determine and reproduce for materials with flow times near the upper limit of the measurement range (100 s) due to slowing-down effects. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1513, Paints and varnishes — Examination and preparation of test samples ISO 4618, Paints and varnishes — Terms and definitions ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https: //www .iso .org/obp — IEC Electropedia: available at http: //www .electropedia .org/ 3.1 flow time t time that elapses from the moment when the material under test starts to flow from the orifice of the filled flow cup to the moment when...
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