Should Your Hydraulic Fluid be Zinc-Free?
Zinc has been a key additive in hydraulic oils for decades. Its primary purpose as an additive is as an anti-wear agent. The zinc forms a sacrificial layer in the form of Zinc Dialkydthiophosphate (ZDDP). ZDDP protects pumps and other parts of the system from wear damage during boundary lubrication instances. The advantage to hydraulic oils with ZDDP is that it will also work as an antioxidant - extending…