Jet-Care US Laboratory is awarded American Bureau of Shipping (ABS) Service Supplier status.

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Spectro | Jet-Care launch new sample kits for marine customers

Find out more in the News section and on the Marine Sample Kits page.

Spectro | Jet-Care confirm compliance with new hydraulic fluid sampling requirements of Airbus OIT

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Spectro | Jet-Care Updates regarding Coronavirus (COVID-19)

All our laboratories remain open - please read the latest information in the News Section of our website.


With decades of experience in industrial markets, we understand the rigorous standards required and the time pressures you face. Our comprehensive range of services, including oil, hydraulic fluid, fuel, transformer, silicon, coolant and gas analysis, are tailored to your specific requirements so you always have the resources available when you most need them.

Total Base Number - TBN

The Base Number (BN) is a measure of the alkalinity of the oil. It is a measure of the effective additive content and thus reflects the oil’s detergent, dispersant and anti-rust properties. The engine manufacturer normally specifies the minimum acceptable BN. A significant decrease may be caused by excessive degradation, a change in the sulphur content of the fuel or by top-up with different oil. The determination of the Base Number, either according to ASTM D2896 method or following an internal procedure, is based on the measurement of the base constituents in both fresh oils and used oils by potentiometric titration with Perchloric acid in glacial acetic acid. The normal range for this application of the method is 0.10 – 300.0 mg KOH/g