ISO 248:2005 pdf download.Rubber, raw - Determination of volatile-matter content.
5.2.1.2.3 When sheeting is impossible, take a log test portion from the homogenized piece and cut it by hand into small cubes with edges of approximately 2 mm. Place the cubes on a watch-glass or an aluminium tray to facilitate weighing. Weigh to the nearest 1 mg (mass ing).
5.2.1.2.4 Alternatively, wtien the rubber is m powdered form, select a test portion of about lOg taken at random and place II on a watch-glass or an aluminium fray to facilitate weighing. Weigh to the nearest 1 mg (mass in9).
5.2.1.3 Oven treatment (natural and synthetic rubbers)
Place the test portion, denved In accordance with either 5.2.1.1 or 5.2.1.2, for 1 h In the oven (5.1.1). maintained at 105°C ± 5 DC. with the ventilators open and with the circulating fan, if fitted, switched on. Arrange the rubber so as to present the largest possible surface area to the hot air. Allow to cool In a desiccator, and weigh. Repeat the heating for further 30 mm periods until the mass does not decrease by more than 1 mg between successive weighing (final mass mb).
5.2.2 Oven method B
5.2.2.1 Weigh a sample of about 250 g and pass It through the mill roll, whose surface temperature is adjusted to about 30°C and the roll clearance to 0.25 mm ± 0,05 mm, to get thin sheet Sample randomly two test pieces of about 50 g froni this sheet and weigh the mass to the nearest 10 mg (mass in11).
5.2.2.2 When this sheeting is impossible due to the sample sticking to the roll, take two test pieces of about 109 directly from the sample. Folow by cutting theni Into small cubes of about 2 mm size. Place them in a twed aluminium fray of 15mm depth and 60 mm diameter or in a tray with similar shape and weigh the mass to the nearest 1 mg (mass in11). Place the fray containing the samples in an oven maintained at 105 °C ± 5 C for 1 h. Remove the fray from the oven and cool fri a desiccator to room temperature. Reweigh the mass (mass m12).
5.2.1.2.4 Alternatively, wtien the rubber is m powdered form, select a test portion of about lOg taken at random and place II on a watch-glass or an aluminium fray to facilitate weighing. Weigh to the nearest 1 mg (mass in9).
5.2.1.3 Oven treatment (natural and synthetic rubbers)
Place the test portion, denved In accordance with either 5.2.1.1 or 5.2.1.2, for 1 h In the oven (5.1.1). maintained at 105°C ± 5 DC. with the ventilators open and with the circulating fan, if fitted, switched on. Arrange the rubber so as to present the largest possible surface area to the hot air. Allow to cool In a desiccator, and weigh. Repeat the heating for further 30 mm periods until the mass does not decrease by more than 1 mg between successive weighing (final mass mb).
5.2.2 Oven method B
5.2.2.1 Weigh a sample of about 250 g and pass It through the mill roll, whose surface temperature is adjusted to about 30°C and the roll clearance to 0.25 mm ± 0,05 mm, to get thin sheet Sample randomly two test pieces of about 50 g froni this sheet and weigh the mass to the nearest 10 mg (mass in11).
5.2.2.2 When this sheeting is impossible due to the sample sticking to the roll, take two test pieces of about 109 directly from the sample. Folow by cutting theni Into small cubes of about 2 mm size. Place them in a twed aluminium fray of 15mm depth and 60 mm diameter or in a tray with similar shape and weigh the mass to the nearest 1 mg (mass in11). Place the fray containing the samples in an oven maintained at 105 °C ± 5 C for 1 h. Remove the fray from the oven and cool fri a desiccator to room temperature. Reweigh the mass (mass m12).
