FTM-202 (FED-STD-791 Method 202.1) Cloud Intensity at Low Temperature
In extremely cold environments components of lubricating oils may become less soluble, causing the oil to become cloudy or “turbid”. This may lessen the effectiveness of the lubricant. This test compares the low temperature turbidity of the sample oil to the turbidity of a standard barium chloride solution.
The sample is placed in the test container and cooled to the test temperature. At the end of the test period the turbidity of the sample is compared to the turbidity of the standard. The turbidity of the sample is reported as “more than”, “less than” or “equal to” the standard.