“The Viscosity Loss Trapezoid – Application of the Viscosity Loss Trapezoid in Determining Overall Features of VI Improver Molecular Weight Distribution”
Presented at Ninth International Savant Conference of the Viscometry of Automotive Lubricants, Deerborn, MI - 1993
Written by T.W. Selby, Savant Inc. -- 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.