ISO 6618:1997

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ISO 6618:1997 refers to an International Organization for Standardization (ISO) standard published in 1997, which outlines a method for determining the "acid or base number" of petroleum products and lubricants using a color-indicator titration technique; essentially, it specifies a standardized way to measure the acidity or basicity of a lubricant sample through a color change reaction with a specific indicator chemical during titration