ASTM D3189-06 (R2021) pd free download.Standard Test Methods for Rubber- Evaluation of Solution BR (Polybutadiene Rubber).
1.1 These test methods cover the standard materials, test formula, mixing procedures, and test methods for evaluation of butadiene rubber (BR) made by polymerization in solution.
1.2 The values stated in SI units are to he regarded as the standard. The values in parentheses are thr information only.
6.5.3.3 Measure and record the batch mass. If it differs from the theoretical value by more than 0.5 %, discard the batch.
6.5.3.4 If required, cut samples from the hatch to allow testing of compound viscosity and processahility in accordance with Test Methods D1646 or D6204, and vulcanization characteristics in accordance with Test Methods D2084 or D5289.
6.5.3.5 If tensile stress strain tests are required. sheet oft to a finished thickness of approximately 2.2 mm (0.087 in.) and condition the compound according to Practice D3 182.
7. Preparation and Testing of Vulcanizates
7.1 For stress-strain testing, prepare the test sheets and vulcanize them in accordance with Practice D3 182.
7.1.1 The recommended standard vulcanization times for the mixes prepared by Test Methods A. B and C are 25, 35, and 50 mm at 145°C (293°F). The recommended cure time for the miniature internal mixer compound is 35 mm at 145°C
(293°F).
7.1.2 Condition the cured sheets for 16 to 96 h at a temperature of 23 ± 2°C (73.4 ± 3.6°F).
Nom 4—Quality control of rubber production may require testing within I to 6 h to provide close surveillance; however, slightly different results may be obtained.
7.1.3 Prepare the test specimens and obtain the modulus. tensile, and elongation parameters in accordance with Test Method D412.
7.2 An alternative to measuring vulcanization characteristics by means of tensile stress measurement on vulcanizates is the measurement of vulcanization characteristics in accordance with Test Method D2084 (Oscillating 1)isk Cure Meter Method) or Test Method D5289 (Rotorless Cure Meter Method). These methods will not produce equal results.
7.2.1 The recommended Test Method D2084 test conditions are 1.67 Hz (100 cpm) oscillation frequency, 1° oscillation amplitude, 160°C die temperature, 30-mm test time, and no preheating. The recommended Test Method D5289 test conditions are 1.67 Hz (100 cpm) oscillation frequency, 0.5° oscillation amplitude. 160° C die temperature. 30-mm test time, and no preheating. Test condition tolerances are specified by the test methods.
8. Precision and Bias
8. 1 This precision and bias section has been prepared in accordance with Practice D4483. Refer to this practice for terminology and other statistical details.
8.2 The precision results in this precision and bias section give an estimate of the precision of the test method with the materials used in the particular interlahoratory program as described below. The precision parameters should not be used for acceptance/rejection testing of any group of materials.ASTM D3189 pdf download.