ASTM D3186-07(R2021) pdf free download

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
6. Mixing Procedures
6.1 The compound may be prepared either on a mill, miniature internal mixer, or laboratory internal mixer, although slightly different results may be obtained. 6.2 Mill Mix Procedure: 6.2.1 For general mixing procedures, refer to Practice D3182. 6.2.2 Mill Mixing Cycle—See Table 2. 6.2.2.1 After mixing according to Table 2, measure and record the batch mass. Ifit differs from the theoretical value by more than 0.5 %, discard the batch. 6.2.2.2 If required, cut samples from the batch to allow testing ofcompound viscosity and processability in accordance with Test Methods D1646 or D6204, and vulcanization char- acteristics in accordance with Test Methods D2084 or D5289. 6.2.2.3 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. 6.3 Miniature Internal Mixer (MIM) Procedure: 6.3.1 For general mixing procedures refer to Practice D3182. 6.3.2 MIM Mixing Cycle—See Table 3. 6.3.2.1 After mixing according to Table 3, turn off the motor, raise the ram, remove the mixing chamber and dis- charge the batch. Record the maximum batch temperature indicated, if desired. 6.3.2.2 Immediately pass the discharge from the mixer twice through a standard mill maintained at 50 6 5°C (122 6 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. Ifit 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 ofcompound viscosity and processability in accordance with Test Methods D1646 or D6204, and vulcanization char- acteristics 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 D3182. 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. Ifit 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 6 5°C (104 6 9°F).
8. Precision and Bias
8.1 This precision and bias section has been prepared in accordance with Practice D4483. Refer to Practice D4483 for terminology and other statistical calculation details. 8.2 The precision results in this precision and bias section give an estimate of the precision of these test methods with the materials (rubbers) used in the particular interlaboratory pro- gram as described below. The precision parameters should not be used for acceptance/rejection testing of any group of materials without documentation that they are applicable to those particular materials and the specific testing protocols that include these test methods. 8.3 A Type 2 (interlaboratory) precision was evaluated. Both repeatability and reproducibility are short term; a period of a few days separates replicate test results. A test result is the average value, as specified by these test methods, obtained on one determination(s) or measurement(s). 8.4 Two different materials (SBR rubbers) were used in the interlaboratory program; were tested in six laboratories on two different days, by the internal mixer method. The results of the precision calculations for repeatability and reproducibility are given in Table 6, as conducted according to Test Method D2084. 8.5 The precision ofthese test methods may be expressed in the format of the following statements that use an “appropriate value” of r, R, (r), or (R), to be used in decisions about test results. The appropriate value is that value of r or R associated with a mean level in Table 6 closest to the mean level under consideration at any given time for any given test parameter, and for any given material in routine testing operations.