​ BIOHYDRAN RS 38 B is a vegetable oil based biodegradable hydraulic fluid. Applied as a replacement of hydraulic mineral oils in activities such as civil engineering, construction, quarrying, gravel plies,… BIOHYDRAN RS 38 B is particularly recommended when there is a possible contamination of water : forestry operations, off-shore, river dredging, winter sport,… BIOHYDRAN RS 38 B can replace mineral oils after a complete drain of the circuit followed by a replacement of the filter.