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Calculate the Total Base Number of a finished lubricant blend from additive treat rates.
TBN_blend = Σ ( TBN_i × wt_fraction_i ) where:
TBN_i = TBN of component i (mgKOH/g, ASTM D2896)
wt_fraction_i = treat rate of component i ÷ 100 Linear blending rule — valid for treat rates < 15 wt%.
Base-oil TBN is typically 0–1 mgKOH/g for mineral oil.TBN per ASTM D2896 (potentiometric perchloric acid titration). Linear blending is the standard approximation at typical concentrations.
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