AS NZS 1462.28:2003 pdf free
AS NZS 1462.28:2003 pdf free.Methods of test for plastics pipes and fittings
Using a scalpel (3.2.2), cut six specimens, each of mass 0,6 mg±0,2 mg for assessing pigment dispersion, or each of mass 0,20 mg±0,10 mg for assessing carbon black dispersion, from different parts of the product to be analysed (see notes 1, 2, and 3). Place the six specimens on one or more clean microscope slides (3.1.2), with each specimen approximately equidistant from its neighbour and from adjacent edges of the slide (see note 4). Cover with another (or other) clean microscope slide(s) or cover slip(s) (see note 5).
NOTE 1 It should be noted that difficulty will be encountered with the microscopic examination of specimens which are too thick.
NOTE 2 The specimens are preferably cut along different axes of the product.
NOTE 3 It is recommended that cutting out the specimens take place on a clean surface to minimize the possibility of extraneous contamination.
NOTE 4 Adherence of the specimens may be improved by heating the slide or using a drop of immersion oil or Canada balsam.
NOTE 5 Shims made of metal or another suitable material may be used to ensure that uniform thickness is obtained. For the specimen mass and thickness given, a film at least 4 mm across is obtained (see note 1).
If an oven (see 3.2.1) is to be used, clamp the two slides together with spring clips (see 3.2.3). Place the clamped slides in the oven, for instance (see 3.2.1) maintained at a temperature between 150°C and 210 °C and leave for at least 10 min until each specimen is pressed out to a film of thickness of at least 60 μm±20 μm for assessment of pigment dispersion or to a thickness of 20 μm±10 um for assessment of carbon black dispersion (see note 1 to 4.1.1.1).
If a rating of the appearance is required, examine each specimen in turn through the microscope (3.1.1) under transmitted light with a magnification of at least x 70. Note the appearance of each specimen in comparison with the photomicrographs (see annex B).AS NZS 1462.28 pdf free download.
