Fire-resistant hydraulic fluid type HFDU based on synthetic esters in combination with the latest zinc- and ashfree additive technology. RENOSAFE FireProtect 46/68 provide highest thermal and oxidative stabillity, excellent copper and yellow metal compatibility and excellent hydrolytic stability. Rapidly biodegradable 60% acc. to OECD 301 B. RENOSAFE FireProtect oils fulfill and surpass the requirements on fire-resistant hydraulic oils acc. to 12922: HFDU.