Varnish Potential Analysis

ASTM D7843 – Varnish Potential Testing

Keep Your Turbine Oil Clean, Healthy and Reliable

Turbine oils naturally degrade over time, creating tiny by‑products that can build up and form varnish—a sticky, harmful deposit that causes sticking valves, rising bearing temperatures and unplanned shutdowns. ASTM D7843 is the industry‑approved test that helps you spot these issues early, long before they affect performance.

This test is known as Membrane Patch Colorimetry (MPC), and it gives you a clear, easy‑to‑understand score showing how likely your oil is to form varnish.