ASTM D5984 Test Method for Semi-Quantitative Field Test Method for Base Number
ASTM D5984 Standard Test Method for Semi-Quantitative Field Test Method for Base Number in New and Used Lubricants by Color-Indicator Titration
6. Apparatus
6.1 Sampling Syringe, fixed volume of 0.35 mL.
6.2 Test Tubes (2), pliable, plastic with threaded tops capable of holding at least 20 mL, one with a standard screw cap and the second with a screw cap that is equipped with a dispenser nozzle.
6.3 Titrating Burette, disposable, 1.0 mL.
6.4 Filter Funnel, capable of removing suspended oil droplets from aqueous solutions. Polypropylene wool has been found to work well for this purpose.
7. Reagents and Materials
7.1 Purity of Reagents - Reagent grade chemicals shall be used in all tests. Pre-packaged, manufactured test kits shall use only reagent grade chemicals.
7.2 Purity of Water - All water will be reagent water as specified by Type III of Specification D1193.
7.3 Hydrochloric Acid, 0.114 mol/L (+/-0.001 mol/L) HCl in propan-2-ol (isopropyl alcohol). (Warning - Flammable.)
7.4 Methyl Red Indicator, 0.05 % (m/v) solution of methyl red in anhydrous ethanol. (Warning - Flammable.)
7.5 Sodium Chloride Solution, 7.0 mL of 20 % (m/m) NaCl in reagent grade, CO2 free water.
7.6 Sodium Hydroxide Titrant, 1.0 mL of 0.0645 mol/L (+/-0.0005 mol/L) NaOH sealed from the environment in a plastic titration burette which is indexed with base number units from 0 to 20. (Warning - Toxic and corrosive.)
7.7 2,2,4-Trimethyl Pentane (isooctane) - (Warning - Flammable.)
