1.1 本试验方法包括测定未使用的发动机冷却液和防锈剂的pH值，以及浓缩产品的已使用或未使用的水稀释液。 注1: 本试验方法不包括固体形式的防锈剂。 注2: 据信，该程序提供了确定可能遇到的发动机冷却液或防锈剂样品pH值所需的所有信息。如果需要有关pH值测定的其他信息，应参考试验方法 E70 . 1.2 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 pH值是氢离子浓度的测量值，表示发动机冷却液、防锈剂或这些化合物的溶液是酸性、碱性还是中性。 4.2 pH值范围包括0到14的值。从0到7的值表示刻度的酸性一半。7到14之间的值表示刻度的碱性或碱性一半。pH值7被认为是中性的，因为它既不酸性也不碱性。 4.3 pH有时用于生产质量控制。通常，发动机冷却液的pH值应为碱性。 4.4 从预测使用寿命的角度来看，pH值并不显著。使用过的发动机冷却液或防锈溶液的pH值不能可靠地表明溶液的现有有效性或剩余寿命。

1.1 This test method covers the determination of the pH of unused engine 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 E70 . 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 pH is a measure of the hydrogen ion concentration and indicates whether an engine coolant, antirust, or a solution of these compounds is acidic, alkaline, or neutral. 4.2 The pH range includes values from 0 to 14. Values from 0 to 7 represent the acidic half of the scale. Values from 7 to 14 represent the alkaline or basic half of the scale. The pH value 7 is considered neutral, as it is neither acidic nor alkaline. 4.3 pH is sometimes used for production quality control. It is generally desirable that engine coolants have an alkaline pH. 4.4 pH is not significant from the standpoint of predicting service life. The pH of used engine coolants or antirust solutions is not a dependable indication of either existing effectiveness or remaining life of the solution.