AS NZS 1462.28:2003 pdf free.Methods of test for plastics pipes and fittings Method 28: Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes, fittings and compounds.
4 Procedure
4.1 Specimen preparation
Two methods of preparation of test specimens are described: a compression procedure and a microtome procedure.
4.1.1 Compression procedure
4.1.1.1 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).
4.1.1.2 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 mm until each specimen is pressed out to a film of thickness of at least 60 pm ± 20 pm for assessment of pigment dispersion or to a thickness of 20 pm 10 pm for assessment of carbon black dispersion (see note 1 to4.1.1.1).
Remove the slides from the oven and, when they are cool enough to be handled, remove the clips.
4.1.1.3 Alternatively place the slides on a hotplate or other heating device (see 3.2.1) at a temperature between 150 °C and 210 °C, and apply pressure using a press or a weight sufficient to produce uniform thickness film according to 4.1.1.2.
Cool before removing the slides for the microscopic examination (see 4.2).AS NZS 1462.28 pdf download.