Savant, Inc. - Technical Papers - Viscosity Loss Trapezoid

Technical Papers

Viscosity Loss Trapezoid (VLT)

"The Viscosity Loss Trapezoid - Part 2: Determining General Features of VI Improver Molecular Weight Distribution Using Parameters of the Viscosity Loss Trapezoid"
Written by Theodore Selby
- SAE Paper #932836 - SAE International Fuels & Lubricants Meeting and Exposition in Philadelphia, Pennsylvania, October 18-21, 1993

ABSTRACT

Building on a previously presented concept of the Viscosity Loss Trapezoid (VLT), in this paper the author shows how the information contained in the VLT can produce a 'viscous' insight into the molecular weight distribution of an oil-soluble polymer such as a Viscosity Index Improver in formulated lubricants.

"The Viscosity Loss Trapezoid - Application of the Viscosity Loss Trapezoid in Determining Overall Features of VI Improver Molecular Weight Distribution"
Written by Theodore Selby
- Savant Conference - Ninth International Conference of the Viscometry of Automotive Lubricants, October 13-14, 1993.

ABSTRACT

Building on a previously presented paper concerning the development of the concept of the Viscosity Loss Trapezoid (VLT), the author shows how closely related dynamic viscosities and viscosity loss parameters produced by measuring the high and low shear rate viscosities of a VI Improver-containing oil before and after degradation of the Viscosity Index Improver can produce a view of the latter's molecular weight distribution. The information gained was enhanced by determining the VLT at two different temperatures of 100° and 150°C.
The method is relatively simple and straight-forward and requires no knowledge of the components of the lubricant examined in order to be quite informative.

"A Method of Generating and Appraising the Five Viscosity Loss Parameters of Lubricating Oil - The Viscosity Loss Trapezoid"
    Written by Theodore Selby
    This presentation was given at the following locations:
        - Rohm GmbH, Darmstadt, Germany, January 20, 1992
        - Elf France, Lyons, France, January 22, 1992
        - TOTAL-Technique in Le Havre, France, January 24, 1992
        - Chevron Chemical Company, Rotterdam, Netherlands, January 27, 1992
        - 8th International Colloquium Tribology 2000, Technische Akademie Esslingen, Germany, January 14-16, 1992
        - Savant Conference - Ninth International Conference on the Viscometry of Automotive Lubricants, October 13-14,1993

ABSTRACT

A new approach to appraising the total viscous influence of VI Improvers, synthetic fluids and their combinations is presented. The technique utilizes four viscometric measurements, two at low shear rates and two at very high shear rates, to generate five different measures of viscosity loss. The technique is described and a number of applications shown for both straight grade and multigrade engines oils.

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