DIN ISO 4593:2019 pdf free.Plastics – Film and sheeting – Determination of thickness by mechanical scanning (ISO 4593:1993).
3 Test specimens
Cut test specimens, about 100 mm wide, across the whole width of the sample. When required, take specimens at positions approximately 1 m apart in the longitudinal direction of the sample. The specimens shall contain no creases except those necessary for folding the film for presentation or packaging purposes. The specimens shall contain no other defects.
4 Procedure
4.1 Condition the specimens for at least 1 h at 23 °C ± 2 °C. For moisture-sensitive films, the conditioning time and atmosphere shall be as stated in the specification for the material under test or as specified between buyer and seller.
4.2 Ensure that the specimens and the faces of the measuñng device (2.1) are free from contamination, for example dust.
4.3 Check the zero point of the measuring device before starting the measurements and recheck after each series of measurements.
4.4 When determining the thickness, lower the foot gently to avoid deforming the material.
4.5 Determine the thickness of the specimens at points equally spaced along the length of the specimen, as follows:
a) for samples less than 300 mm wide — 10 points;
b) between 300 mm wide and 1 500 mm wide — 20 points;
c) more than 1 500 mm wide — minimum 30 points. Measurements shall not be taken within 50 mm of the edges of untrimmed rolls.
5 Precision
The precision of this test method is not known because interlaboratory data are not available. When interlaboratory data are obtained, a precision statement will be added at the following revision.
6 Test report
The test report shall include the following:
a) a reference to this International Standard;
b) all details necessary for identification of the sample;
c) the types of measuring face used and the force applied;
d) the length of the specimens;
e) the number of specimens measured; f) the arithmetic mean of the individual measurements, to the nearest 1 pm or 0,00 1 mm, reported as the average mechanically measured thickness of the specimens; if required, the individual readings shall also be reported;
g) the total number of measurements made and, if required, the standard deviation.DIN ISO 4593 pdf download.