BS EN ISO 2431:2019
$102.76
Paints and varnishes. Determination of flow time by use of flow cups
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 22 |
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.
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 4 | European foreword Endorsement notice |
| 6 | Foreword |
| 7 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Temperature considerations 5 Apparatus 5.1 Flow cups 5.1.1 Dimensions 5.1.2 Material 5.1.3 Construction |
| 11 | 5.1.4 Finish |
| 12 | 5.1.5 Measurement range |
| 13 | 5.1.6 Marking 5.1.7 Care and checking of flow cups |
| 14 | 5.2 Supplementary apparatus 6 Sampling 7 Procedure 7.1 Preliminary check for Newtonian flow 7.2 Determination of flow time 7.2.1 Choice of flow cup 7.2.2 Temperature adjustment |
| 15 | 7.2.3 Preparation of the flow cup 7.2.4 Filling the flow cup 7.2.5 Measurement of flow time 7.2.6 Repeat determinations 8 Marking of products tested |
| 16 | 9 Precision 9.1 General 9.2 Repeatability limit, r 9.3 Reproducibility limit, R |
| 17 | 10 Test report |
| 18 | Annex A (normative) Checking flow cups for wear and tear |
| 20 | Annex B (informative) Conversion of flow times from one temperature to another |
| 22 | Bibliography |
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BS EN ISO 2431:2019
Paints and varnishes. Determination of flow time by use of flow cups Published By Publication…
