If you are referring to a specific Bosch part number, internal factory standard, or a different document (e.g., an EU standard like EN 153:2006 for solid recovered fuels), please clarify. The following report covers the widely referenced Bosch Rexroth standard for hydraulic fluids. Technical Report: Bosch Rexroth EN 153 (RDE 90235-01) 1. Scope Bosch EN 153 (formally documented under RDE 90235-01 or the earlier RE 90235 ) is a Bosch Rexroth specification for environmentally acceptable hydraulic fluids . It defines the requirements for fluids used in hydraulic systems where leakage into soil or water is a risk (e.g., forestry, agriculture, marine, construction). 2. Key Fluid Categories The standard covers three main types of biodegradable fluids: