ASTM D5018 Standard Test Method for Shear Viscosity of Coal-Tar and Petroleum Pitches
1. Scope
1.1 This test method covers the determination of the apparent shear viscosity of coal-tar and petroleum-based pitches having a Mettler softening point (SP) range of approximately 95 °C to 120 °C (see Test Method D3104).
1.2 This test method is applicable only for rotational viscometers.
1.3 Since this test method is based on theoretical grounds, strict adherence to details of the procedure is necessary to comply with the theoretical requirements.
1.4 The values stated in SI units are to be regarded as standard.
1.4.1 Exception - The values stated in conventional units (centipoise) are to be regarded as the standard for viscosity measurement only. The SI unit is the pascal second (Pa·s) and one millipascal second (mPa·s) = one centipoise (cP); centipoise is in cgs units.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 7.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D3104 Test Method for Softening Point of Pitches (Mettler Softening Point Method)
D4296 Practice for Sampling Pitch
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E1953 Practice for Description of Thermal Analysis and Rheology Apparatus
E2975 Test Method for Calibration or Calibration Verification of Concentric Cylinder Rotational Viscometers
