ASTM D1121
ASTM D1121 – Standard Test Method for Reserve Alkalinity of Engine Coolants and Antirusts Description: Significance and Use 5.1 Reserve alkalinity is the number of millilitres, to the nearest 0.1 mL of 0.100 N hydrochloric acid (HCl) required for the titration to a pH of 5.5 of a 10 mL sample of an undiluted, unused coolant, antirust, or …


