FREEZING POINT: ASTM D5901
(Equivalent Test Method: IP 434)
This is an automated optical method used for the temperature range 0 to -70° C. Results by this test method have a resolution of 0.1° C. A 25-mL portion of the fuel is placed in a test chamber, which is cooled while continuously being stirred and monitored by an optical system.
The temperature of the specimen is measured with an electronic measuring device. Temperatures when crystals first appear, and then on warming disappear, are recorded.
