Standard Test Method for Measuring Solution Viscosity of Polymers with a Differential Viscometer
Standard Test Method for Measuring Solution Viscosity of Polymers with a Differential Viscometer
SIGNIFICANCE AND USE 5.1 Solution viscosity values for polymers are related to the average molecular size of that portion of the polymer which dissolves in the solvent. SCOPE 1.1 This test method covers the determination of the solution viscosity of polymers using a differential or the modified differential viscometer. It is applicable to all polymers that dissolve completely without chemical reaction or degradation to form solutions that are stable with time and temperature. Results of the test are usually expressed as specific viscosity, intrinsic viscosity (limiting viscosity number), inherent viscosity (logarithmic viscosity number), or relative viscosity (viscosity ratio). 1.2 Since there is more than one type of viscometer available to measure a differential pressure, follow the manufacturer’s directions applicable to the equipment being used. 1.3 The solution viscosity values are comparable with those obtained using a glass capillary of Test Method D2857. This test method differs from the glass capillary in that the solvent and the solution are compared at the same time that a test is run. With a glass capillary, each solution must be referenced back to the solvent run in the same capillary at the same temperature. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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. For specific hazard statements, see Section 8. Note 1: There is no known ISO equivalent to this standard. 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.
ASTM D5225-22: Standard Test Method for Measuring Solution Viscosity of Polymers with a Differential Viscometer defines a reliable procedure for determining the solution viscosity of polymers. This test method is suitable for all polymers that dissolve completely and do not degrade or react with the solvent, resulting in stable solutions under controlled time and temperature conditions.
Viscosity values obtained by this method are key to understanding the average molecular size of dissolved polymers. Solution viscosity can be reported as specific viscosity, intrinsic viscosity, inherent viscosity, or relative viscosity, supporting broad applicability in research, quality control, and material characterization in the polymer industry.
ASTM D5225-22 is widely used in the plastics and polymer industries for quality assurance, material development, and research applications. Its core benefits include:
Другие стандарты ASTM
Unlike traditional glass capillary methods, this standard permits faster, more accurate viscosity comparison between sample and solvent by measuring both simultaneously. This speeds up analysis and minimizes potential errors due to temperature or solvent changes.
Safety Note: Solvents and compressed gases used may present health or environmental risks. Proper safety, health, and environmental practices must be established before use.
ASTM D5225-22 interfaces with a range of key documents and terminology within the materials testing and polymer industries:
Note: No ISO equivalent currently exists for this standard. ASTM D5225-22 was also developed in accordance with internationally recognized standardization principles set by the World Trade Organization's TBT Committee.
To maximize the benefit of ASTM D5225-22, users should always refer to the most recent version of the standard and follow equipment manufacturer recommendations for viscometer operation.