Tanker Terminology  Anti-static additive A substance added to a petroleum product to raise its electrical conductivity to a safe level above 50 picoSiemens/metre (pS/m) to prevent accumulation of static electricity.   Auto-ignition The ignition of a combustible material without initiation by a spark or flame, when the material has been raised to a temperature at which … Continue reading Tanker Terminology used in Shipping