This test method deals with the standards for the measurement of apparent viscosity of roofing bitumen by mean of a parallel plate plastometer. This method involves measuring viscosity using pre-determined arbitrary shear stress levels. The method involves molding the sample into a disc of specified dimensions, heating it to a selected temperature and placing it between the plates of a pre-heated apparatus and pressing under the standard conditions for a measured time.
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1.1 This test method covers the measurement of apparent viscosity of roofing bitumen by means of a parallel plate plastometer. This test method is applicable for a viscosity range from 102 to 109 Pa·s (103 to 1010 poises). See Note 1.
Note 1—This relatively simple test method of measuring viscosity uses pre-determined arbitrary shear stress levels. Since roofing bitumens are non-Newtonian, other viscosity test methods may give different results.
1.2 The values stated in SI units are regarded as standard. The inch-pound units given in parentheses are for information only.
1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D140 Practice for Sampling Bituminous Materials
D312 Specification for Asphalt Used in Roofing
D450 Specification for Coal-Tar Pitch Used in Roofing, Dampproofing, and Waterproofing
D2171 Test Method for Viscosity of Asphalts by Vacuum Capillary Viscometer
D3205 Test Method for Viscosity of Asphalt with Cone and Plate Viscometer
apparent viscosity; bitumen; flow; parallel plate; plastometer; viscosity; Bituminous roofing materials; Parallel-plate applications/testing equipment; Viscosity--asphalts/bituminous materials;
ICS Number Code 91.100.50 (Binders. Sealing materials)
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