ASTM D4054 Standard Practice for Evaluating the Compatibility of Additives with Aviation-Turbine Fuels and Aircraft Fuel System Materials
3. Summary of Practice
3.1 These procedures are laboratory techniques for establishing additive compatibility with commercial aviation turbine fuels, with additives previously approved in standard fuels and with the fuel system components used in commercial aircraft, including tank coatings, sealants, and elastomers. Tests are conducted with Jet A/A-1 fuel at four times the maximum additive concentration as recommended by the additive supplier. Immersion tests, with fuel system components only, are conducted in the more severe Reference Test Fluids, TT-S-735, Types III and VII. The time and temperature of immersion tests are representative of aircraft use conditions and immersed components are evaluated after exposure, using industry standard methods. Comparisons are made with representative components exposed to the base fluid with and without additive.
NOTE 1 - Data obtained with Jet A/A-1 fuels can be applicable to Jet B fuel or to aviation fuels specified by other organizations, with the agreement of the approving air frame/engine manufacturer.
4. Significance and Use
4.1 Additives are generally used to enhance a fuel property such as oxidation stability or to improve fuel performance by providing corrosion inhibition, protection against icing, metal deactivation, and so forth. However, their use can adversely affect other fuel properties or the ground-handling systems for fuels. Application of the procedures of this practice is intended to disclose these adverse effects.
4.2 Combinations of additives may exhibit antagonistic effects on fuel properties or performance. Compatibility testing with previously approved additives is intended to disclose such antagonistic effects of incompatibilities.
4.3 Fuel system components such as sealants, coatings, and elastomers are normally selected because of their resistance to a Reference Test Fluid, which is designed to be more severe to components than standard fuels. Application of the procedures of this practice is intended to disclose adverse effects of additives beyond the effects of the Reference Test Fluids.
