The VDMA 24570, although simple, is a very severe test and is used quickly break down biodegradable oils. The fluid is contaminated with petroleum oil and water. It is then heated to 120° C (248 ° F) and sample strips are added. The fluid and sample strips are agitated with glass beads that work to grind the test samples. After 96 hours, the samples are weighed and the mass loss is determined. The samples are also evaluated for corrosion and are rated none, weak, strong and extreme. Typically Brass (CuZn35Mn2Si), Cast Bronze (CuPb15Sn8), Sintered Bronze (CuPb10Sn8) and Bearing Steel 100(Cr6) are used.
As part of a project with National Oilwell Varco (NOV), Terresolve Technologies, Ltd (Eastlake OH) ran their readily biodegradable and non-toxic EnviroLogic 3068 hydraulic fluid against this very severe protocol. The results are in and in the words of one engineer, "...it has been a long time that we saw such an exceptionally good biodegradable oil!"
Please read the attached details.

090720_Terresolve_VDMA2.pdf (26 KB, 45 downloads) VDMA 24570 Test and Result Details