ASTM D3192-09 pdf free.Standard Test Methods for Carbon Black Evaluation in NR (Natural Rubber).
These test methods cover the standard materials, test formulation, mixing procedure, and test methods for the evaluation and production control of carbon blacks in natural rubber (NR).
5. Sampling and Sample Preparation
5.1 Samples shall be taken in accordance with Practice D 1799 or Practice D 1900.
5.2 The carbon black shall be conditioned before weighing and mixing by heating for I h in an oven set at 125 +1°C. The black shall be placed in an open vessel of suitable dimensions so that the depth of black is no more than 10 mm during conditioning. The black conditioned as above shall be stored in a closed moisture-proof container until ready for mixing.
6. Mixing Procedures
6.1 For general mixing procedure refer to Practice D 3182 The following mixing procedures are acceptable in testing carbon black: 1) Test Method A-Mill Mix, 2) Test Method B–Internal Mixer, and 3) Test Method C – Miniature Internal Mixer.
8.5.2 Reproducibility
8.5.2.I Tensile Stress at 300 Elongation-The pooled reproducibility of Test Methods D 3192 Method C(using Test Methods D 412 Method A)tensile stress at 300 % elongation has been established as 1.07 MPa (156 psi). Two single test results (or determinations) produced in separate laboratories that differ by more than 1.07 MPa(156 psi)must be considered suspect, that is, that they represent different sample popula tions. Such a decision dictates that appropriate investigative or technical or commercial actions or both, be taken.
8.5.2.2 Tensile Strength-The pooled reproducibility of Test Methods D 3192 Method C (using Test Methods D 412 Method A) tensile strength has been established as 3.02 MPa (438 psi).Two single test results (or determinations )produced in separate laboratories that differ by more than 3.02 MPa (438 psi)must be considered suspect, that is, that they represent different sample populations. Such a decision dictates that appropriate investigative or technical or commercial actions, or both, be taken.
8.5.2.3 Ulilmate Elongation—The pooled reproducibility of Test Methods D 3192 Method C (using Test Methods D 412 Method A) ultimate elongation has been established as 86.4 %. Two single test results (or determinations) produced in separate laboratories that dilier by more than 86.4 % must be considered suspect, that is, that they represent different sample populalions. ASTM D3192-09 pdf download.