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BS EN 4426:2020

BS EN 4426:2020

$86.31

Aerospace series. Non-metallic materials. Textiles. Test method. Determination of conductivity and pH of aqueous extracts

Published By Publication Date Number of Pages
BSI 2020 12
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This document specifies the requirements for the determination of conductivity and pH of aqueous extracts of textile materials.

This method has been written in response to an aerospace requirement for a method of extraction using hot water as the EN 1413 requires only a cold water extraction method.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 Introduction
7 1 Scope
2 Normative references
3 Terms and definitions
4 Health, safety and environment
8 5 Principle/technique
6 Resources
6.1 Apparatus/facilities
6.2 Materials/reagents
6.3 Qualification of personnel
7 Test samples/test pieces
9 8 Test procedure
8.7 Measurement of conductivity: when ready to make conductivity measurement remove the stopcock from the flask and transfer some of the aqueous extract to the conductivity cell. Wash the cell with two (2) or three (3) changes of extract re-stoppering the flask as soon as possible. Measure the electrical resistance of the extract with the meter (6.1.6) and the temperature of the extract. Calculate the conductivity from the formula given in 9.2.
8.8 Measurement of pH: standardize the pH meter at the temperature of the extract to be measured and calibrate the pH meter using two buffer solutions. For acidic values calibrate using buffer solution 4 pH and 7 pH. For alkaline values calibrate using buffer solution 7 pH and 9 pH.
10 9 Expression of results
9.1 Individual results
9.2 Calculation of conductivity
10 Calculation of pH
11 Measurement uncertainties
12 Designation
13 Test report

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BS EN 4426:2020
$86.31