Electrical conductivity is an essential characteristic of aviation and distillate fuels because it directly influences how safely the fuel can be handled. When fuel flows through pipelines, filters, and hoses, it naturally accumulates static electricity. If the fuel cannot dissipate this charge quickly enough, it may generate a spark capable of igniting fuel vapors and causing fires or explosions. This risk becomes particularly significant in cold or dry environments where static discharge is more likely.
Conductivity is measured to ensure that fuel can safely release static electricity during movement. Aviation turbine fuel specifications, such as Def Stan 91-091 and ASTM D1655, define minimum acceptable conductivity values to prevent hazardous static build-up. The standardized test method for determining conductivity is ASTM D2624, which allows operators to verify whether a fuel meets the necessary requirements for safe handling. The Joint Inspection Group and ICAO also emphasize conductivity monitoring as part of globally recognized aviation fuel quality protocols.
Static dissipator additives, often referred to as SDA, can be used when fuel conductivity falls below specification. These additives increase the rate at which charge dissipates, but they must be handled carefully because overdosing can alter fuel properties or violate specification limits. Conductivity decreases naturally over time as additives degrade, and it is also influenced by changes in temperature and fuel composition. For this reason, conductivity is routinely monitored throughout the supply chain—from refinery production to terminal transfer to final aircraft uplift.
Low conductivity presents several operational risks. Fuel handlers may be unable to load or unload products safely, leading to delays. Filtration systems may be stressed, and the chance of static ignition increases dramatically. Maintaining proper conductivity is therefore a shared responsibility that involves refiners, traders, airport operators, and fuel suppliers.
AmSpec provides extensive conductivity testing services across the Energy and Chemical sector. These include laboratory and field testing under ASTM D2624, aviation fuel certification to ASTM D1655 and Def Stan 91-091, and verification of static dissipator additive treatment. Through these services, AmSpec helps ensure that fuels remain safe, compliant, and suitable for use in high-risk environments such as airports and major distribution hubs.