FILTERABILITY OF DIESEL FUELS BY LTFT: ASTM D4539
EXPLANATION
The low temperature flow test (LTFT) results are indicative of the low temperature flow performance of fuel in some diesel vehicles. This test method is especially useful for the evaluation of fuels containing flow improver additives.
TEST SUMMARY
The temperature of a series of test specimens of fuel is lowered at a prescribed cooling rate. At the commencing temperature and at each 1 ° C interval thereafter, a separate specimen from the series is filtered through a 17-μm screen until a minimum LTFT pass temperature is obtained. The minimum LTFT pass temperature is the lowest temperature, expressed as a multiple of 1 ° C, at which a test specimen can be filtered in 60 s or less.
TEST PRECISION
Repeatability: 2°C
Reproducibility: 4°C
No statement of bias can be made for this test method.
