Standard Test Method for pH of Coolants and Antirusts
pH is a measure of the hydrogen ion concentration and indicates whether a coolant, antirust, or a solution of these compounds is acidic, alkaline, or neutral.
pH is sometimes used for production quality control. It is generally desirable that coolants have an alkaline pH.
pH is not significant from the standpoint of predicting service life. The pH of used coolants or antirust solutions is not a dependable indication of either existing effectiveness or remaining life of the solution.
1.1 This test method covers the determination of the pH of unused coolants and antirusts, and used or unused aqueous dilutions of the concentrated products.
Note 1—Antirusts in solid form are not included in this test method.
Note 2—It is believed that this procedure gives all the information required for determining the pH of samples of engine coolant or antirust likely to be encountered. Should additional information on pH determinations be needed, reference should be made to Test Method E-70.
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