Laboratory parameters for high water based hydraulic fluid testing

Abstract

A review of the composition and properties of current water-containing hydraulic fluids leads to the conclusion that current technology could be improved towards a high water containing fluid with good antiwear, low toxicity and high fire resistance characteristics. A modified pump test was used based on ASTM D2882, using a Vickers V105C apparatus. Wear rate data is presented for various candidate fluids including a full synthetic, showing differences between HFA, HFB, HFC and HWBF and looking at variations in break-in wear and subsequent wear behaviour. Data is also presented for candidate fluids tested in industrial-type hydraulic pumps, and illustrates the role of viscometric properties including shear stability.