ASTM D3186-07 (R2021) pdf free download.Standard Test Methods for Rubber- Evaluation of SBR (Styrene-Butadiene Rubber) Mixed With Carbon Black or Carbon Black and Oil.
1.1 These test methods cover the standard materials, test formula, mixing procedures. and test methods for the evaluation and production control of pigmented types of styrenehutadiene rubbers (SBR). This includes the pigmented SBR oil masterhatches.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
6.3.2.2 Immediately pass the discharge from the mixer twice through a standard mill maintained at 50 ± 5°C (122 ± 9°F) with a roll separation of 0.5 mm (0.020 in.) once, then twice at a separation of 3 mm (0.12 in.) in order to dissipate heat. Pass the rolled batch endwise through the mill six times with an opening of 0.8 mm (0.032 in.) to enhance the dispersion.
6.3.2.3 Measure and record the batch mass. If it differs from the theoretical value by more than 0.5 %, discard the batch.
6.3.2.4 If required, cut samples from the batch to allow testing of compound viscosity and processability in accordance with Test Methods D 1646 or D6204, and vulcanization characteristics in accordance with Test Methods D2084 or D5289.
6.3.2.5 If tensile stress strain tests are required, sheet off to a finished thickness of approximately 2.2 mm (0.087 in.) and condition the compound according to Practice D3182.
6.4 Internal Mixer Procedure:
6.4.1 For general mixing procedure refer to Practice D3 182.
6.4.2 Mixing Cycle-Initial Mix—See Table 4.
6.4.2.1 After mixing according to Table 4, measure and record the batch mass. If it differs from the theoretical value by more than 0.5 %, discard the batch.
6.4.2.2 Pass the batch immediately through the standard laboratory mill three times, with a mill opening of 6.0 mm (0.25 in.) and roll temperature of 40 ± 5°C (104 ± 9°F).
6.4.2.3 Allow the batch to rest for I to 24 h.
6.4.3 Final Mix—See Table 5.
6.4.3.1 After mixing according to Table 5, measure and record the batch mass. If it differs from the theoretical value by more than 0.5 %, discard the batch.
6.4.3.2 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.
6.4.3.3 If tensile stress strain tests arc rcquired. sheet off to a finished thickness of approximately 2.2 mm (0.087 in.) and condition the compound according to Practice D3182.ASTM D3186 pdf download.