Colored varnish precursors accumulate from
normal oil breakdown; these can be measured
by MPC (Membrane Patch Colorimetry) testing.

Oil is mixed with solvent to convert
dissolved varnish precursors into solids
that can be trapped on a filter patch.

The patch is scanned using a
spectrophotometer to provide an MPC value.

MPC values over 15 should be addressed.

MPC Varnish Potential Testing

Lubricant varnish potential testing (MPC, Membrane Patch Colorimetry, ASTM D7843) is an essential part of turbine and compressor lubricant management.

Varnish potential testing identifies the propensity of a lubricant to form solid deposits so that maintenance professionals can avoid catastrophic failures.

While most customers are able to take advantage of our complimentary initial assessment, or SVR™ System Monitoring (for new SVR™ system installations) remote sites or commercial oil labs require on-site MPC testing. For this purpose, users have the option to purchase a spectrophotometer and either a laboratory grade MPC test kit or as stainless steel MPC portable test kit.

The video provides an overview of the test and shows the equipment and accessories required to complete it.

Key Features of MPC Test Kits

  • High-quality, laboratory-grade equipment
  • Includes all materials and consumables required to prepare the patch used for measuring MPC varnish potential
  • Simple to use, with step-by step instructions and video demonstration
  • Expert support from the EPT chemistry team who has completed 1000s of MPC tests