EN 478-2018 pdf download.Plastics – Poly(vinyl chloride) (PVC) based profiles – Determination of the appearance after exposure at 150 °C.
This EN 478 specifies a method for determining the effect of heat on unplasticized poly(vinyl chloride) (PVC-U) profiles, to be carried out in air at 150 °C.
It is also applicable to PVC-based profiles at specified temperatures/test conditions.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org)
— ISO Online browsing platform: available at hnpJjwwwJso.org/obp
3.1
defect
visual appearance of blisters, cavities or cracks on any of the surfaces (inner and outer) of the profile and of any delamination in the cross section
4 Principle
A test specimen of a specified length of profile is maintained in an oven at 150 C for 30 mm and is inspected visually on the inside, outside and the cross-section of the wall for defects after heating.
5 Apparatus
5.1 Ventilated oven, thermostatically controlled, with air circulation, in which the test specimens can be exposed to a temperature of 150 °C.
The oven shall be equipped with a thermostat capable of maintaining the temperature at (150 ± 3) °C and a support system which keeps the specimen in position and enables heat transfer.
NOTE The use of talc or PTFE foil can be convenient to avoid sticking.
The capacity of the oven shall be such that, after insertion of the test specimen, the test temperature is regained within 15 min.
6 Test specimen
The test specimen shall have a minimum length of 200 mm of profile.
7 Test procedure
7.1 Set the oven temperature to 150 °C.
7.2 When the oven has reached 150 °C, place the test specimen horizontally in the oven.
7.3 Maintain the test specimen in the oven for (30o) mAn, measuring from the time when the oven temperature has returned to 150 °C.
7.4 Remove the test specimen from the oven, taking care not to distort or otherwise damage it.
7.5 Allow the test specimen to cool in air. When the test specimen is cool enough for handling, examine it for defects,
8 Expression of results
The nature and the location of any defects shall be noted.
9 Test report
The test report shall include the following information:
a) reference to this document (i.e. EN 478);
b) the test laboratory;
c) full identification of the profile;
d) the date of testing;
e) the apparatus used;
1) the results of the examination of the test specimen;
g) all operating details not specified in this document, as well as any incidents likely to have influenced the results.EN 478-2018 pdf download.