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BS EN ISO 2556:2001

$102.76

Plastics. Determination of the gas transmission rate of films and thin sheets under atmospheric pressure. Manometric method

Published By Publication Date Number of Pages
BSI 2001 16
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PDF Catalog

PDF Pages PDF Title
1 BRITISH STANDARD
2 Committees responsible for this British�Standard
3 Contents
6 Foreword
7 1 Scope and field of application
2 Reference
3 Definition
3.1
4 Principle
5 Apparatus and materials
5.1 Metal cell
8 5.2 Calibrated capillary tube
5.3 U-tube
5.4 Mercury reservoir
5.5 Vacuum pump
5.6 Mercury barometer.
5.7 Thermometer
5.8 Mercury
5.9 Test gases
9 6 Test specimens
7 Procedure
7.1 Introduce the mercury into the reservoir (
7.2 If an apparatus according to�
7.3 Smear a very thin film of vacuum grease in the region of the joint, taking care not to put it…
7.4 Mount the specimen, then the rubber gasket, and finally the upper part of the metal cell.
7.5 Clamp the two parts of the cell together so that the joint is perfectly airtight.
7.6 Join the gas entry tube through the drying column to the reservoir of compressed gas. Pass th…
7.7 Connect the stopcock to the vacuum pump and operate the pump until the pressure in chamber�2 …
7.8 Close the stopcock, then tilt the apparatus to cause the mercury to run into the capillary an…
7.9 Note the value
10 7.10 At the end of the measurements, return the mercury to the reservoir, allow air to enter the …
7.11 At the end of the test, measure and record the atmospheric pressure
8 Expression of results
8.1 Initial volume of chamber�2
8.2 Calculation of correction coefficient
8.3 Determination of transmission rate
12 9 Test report
13 Figure 1 Example of apparatus with overflowing
14 Figure 2 Example of apparatus without overflowing
BS EN ISO 2556:2001
$102.76