Most people don't realize just how punishing the environment inside a hydraulic system actually is. Industrial and construction equipment routinely operates at pressures exceeding 3,000-5,000 PSI, with some systems pushing past 10,000 PSI. At these pressures, the fluid itself becomes a structural component, and metal surfaces are forced together with incredible force. Without proper lubrication, this metal-to-metal contact would weld components together in milliseconds.
Add extreme temperatures—often surpassing 100°C in mobile equipment—and you create conditions where ordinary oils simply break down. The molecular structure degrades, protective film strength collapses, and catastrophic wear accelerates. This is precisely why modern hydraulic fluids incorporate extreme pressure (EP) additives that form protective chemical layers on metal surfaces under stress.
For these demanding applications, formulations like HLP 68 combine refined mineral bases with specialized EP-additive technology designed specifically for high-pressure industrial and construction hydraulic systems.
