BS ISO 9113:2019 pdf free.Plastics – Polypropylene (PP) and propylene-copolymer thermoplastics- Determination of isotactic index.
5.1.1 Reduce the propylene plastic solid matter to particles fine enough to pass through the sieve [4.6]. For powder, flakes, fibres or films, grinding and screening are unnecessary if at least one dimension is less than 0,6 mm. Films shall be cut into small fragments or changed to a crushable form by melting to the shape of ribbons or small plaques. 5.1.2 Grind the sample as follows. Mix at least 10 g of the sample with solid carbon dioxide or liquid nitrogen in excess, place it in the grinding mill (4.5) and crush until reduced to small particles. After screening, collect the matter which passes through the sieve (4.6) and allow standing at room temperature until it is tested. 5.2 Determination 5.2.1 Weigh the glass fibre or paper cartridge (4.2), dried to constant mass at 140 °C and cooled to room temperature in a desiccator, to the nearest 0,000 1 g (mass m1) (see 5.2.5). Then, fill it with approximately 5 g of the sample and place it in the oven (4.3) controlled at 140 °C士2。C, under 25 kPa nitrogen vacuum or less. This means that the existing residual pressure of nitrogen in the apparatus shall be 25 kPa or lower (see 5.2.6).Usually, 2 h are sufficient for complete drying and sample annealing, but calibration of the oven efficiency is recommended to determine the minimum time required to achieve constant mass of the samples. 5.2.2 Cool the cartridge containing the test portion to room temperature in a desiccator and weigh again to the nearest 0,000 1 g (mass m2]. Record the mass of the propylene plastic test portion by difference (m2 – m1). Then place the cartridge in the extractor trap (see Figure 1) and extract with boiling n-heptane (analytical grade, free from aromatic components) for 24 h (see 5.2.5 and 5.2.2). 5.2.3 Regulate the solvent boiling rate to give 15 to 25 extractions per hour, using 300 ml of n-heptane in the flask.BS ISO 9113 pdf download.