Here's something most people don't realize: modern industrial hydraulic systems routinely operate at pressures exceeding 3,000 PSI, with many heavy-duty applications pushing past 5,000 PSI or even 10,000 PSI. To put that in perspective, the pressure at the deepest point of the ocean—the Mariana Trench—is about 16,000 PSI. Your hydraulic excavator or press is working under conditions comparable to being two miles underwater.
At these extreme pressures, the oil film between metal surfaces becomes thinner than a human hair, sometimes just a few microns thick. Without the right chemistry, that film collapses, leading to metal-to-metal contact, wear, and catastrophic failure. This is why extreme pressure (EP) additives became revolutionary in hydraulic oil formulation—they form protective chemical layers that activate precisely when pressures spike.
Modern formulations like HLP 68 use advanced EP additive technology specifically engineered for high-pressure industrial and mobile hydraulic systems.
