Search
Language
ENGLISH

ASTM D2068 & IP387

ASTM D2068 is a standard test method used to determine the Filter Blocking Tendency (FBT) and filterability of middle distillate fuels, including diesel fuel, gas oil, kerosene, biodiesel (B100), and biodiesel blends. The test evaluates a fuel's tendency to block fine fuel filters due to insoluble contaminants, degradation products, wax crystals, or other particulate matter. It is widely used for refinery quality control, fuel storage monitoring, and specification compliance, particularly where high-performance fuel filtration systems are used.

 

A 300 mL fuel sample is pumped through a standardized filter at a constant flow rate while the pressure drop across the filter is continuously monitored. The test is completed when either the full sample has passed through the filter or the maximum specified pressure is reached. The measured pressure and filtered volume are used to calculate the Filter Blocking Tendency (FBT). Lower FBT values indicate cleaner fuels with better filterability, while higher values indicate an increased risk of fuel filter plugging.

View as Grid List

1 Item

Set Descending Direction
  1. Tamson FBT ASTM D2068 IP 387
    Automated TFBT conforming to ASTM D2068 & IP387
per page

General:

Causes of poor filterability might include fuel degradation products, contaminants picked up during storage or transfer, or interaction of the fuel with the filter media. A change in filter performance after storage or pretreatment can be indicative of changes in filter condition. This test method is intended for use in evaluating distillate fuel cleanliness in those applications that demand a high throughput per installed filter. This test method is applicable to fuels within the viscosity range of 1.50 to 6.00 cSt at 40°C. This test method is not applicable to fuels that are not clear and bright because water interferes with the measurement of filter plugging. Relative tendency of fuels to plug filters may vary depending on filter porosity and structure, and may not always correlate with the results from this test method,

Test:

A sample of fiiel is passed at a constant flow rate (20 mL/min) through a glass fiber filter medium. The pressure drop across the filter is monitored during the passage of a fixed volume of test fuel. If a prescribed maximum pressure drop is reached before the total volume of fuel is filtered, the actual volume of fuel filtered at the time of maximum pressure drop is recorded. The apparatus is required to be calibrated at intervals.

Precision:

This test method has a repeatability of 0.27 (FPT- 1) and a reproducibility of 1.405 (FPT-1) where FPT is the normalized result.

This test method has no bias.