Efficiency Meets Precision: The Future of Kinematic Viscosity Testing

Viscosity is a critical parameter in the analysis of petrochemical samples, requiring precision and compliance with rigorous standards. While ASTM D445 capillary methods have served as a traditional solution, advancements in measurement technology have introduced ASTM D7042 as a sophisticated alternative, effectively overcoming limitations inherent in gravity-based measurements.

ASTM D445, the traditional method using glass capillaries and gravity, has long been a go-to approach, but it is labor-intensive, especially the original, manual procedure. Maintaining temperature stability with liquid baths, monitoring with dual thermometers, and the need for a lengthy temperature equilibration process are inherent to D445. While automated versions exist, they remain rooted in the manual method, requiring maintenance to ensure consistency.

Anton Paar’s SVM series viscometers, designed to provide measurements in line with ASTM D7042, combine dynamic viscosity measurements with density measurements according to D4052, and calculation of kinematic viscosity in a single, streamlined step. This integrated approach eliminates the need for multiple tests, enhancing productivity and significantly reducing lab space requirements as well as investment costs. Additionally, precise Peltier temperature control allows measurements from -20 °C to +135 °C with rapid adjustments (up to 20 °C/min) without the need for external thermostats or liquid baths.

Engineered for efficiency, the SVM minimizes both sample and solvent use, significantly lowering waste disposal and solvent costs, and supporting sustainable practices by reducing solvent consumption by over 50 %. For D7042-compliant measurements, the SVM requires only 5 mL of sample, with the flexibility to further reduce sample volume to 1.5 mL in routine, non-compliance measurements. To ensure consistency, routine calibrations are performed monthly. This simple verification process ensures dependable results and adds traceability in reporting. Additionally, if reporting results according to D445 is required, ASTM-published bias correction factors are integrated into the SVM’s software, enabling D7042 measurements with calculated D445 results.

The SVM offers a reliable solution for viscosity measurement. Its measurement principle is internationally recognized, not only reflected in the standardized test method but also in the standard specifications of numerous petroleum products that reference the method. This makes the SVM a versatile, trusted instrument across a wide range of industry applications.