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ASTM D 7843 Membrane Patch Colorimetri

Category: Laboratory

Standard Test Method for Measurement of Lubricant Generated Insoluble Color Bodies in In-Service Turbine Oils using Membrane Patch Test Colorimetry


Varnish and sludge are insoluble materials. Colorimetric analysis is a method for determining the potential varnish value, namely by the filtration process indicated by the color value (dE), which is based on ASTM D 7843. The use of a solvent that is in accordance with the insoluble nature of the material can prove whether the material is varnish or sludge.

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