Contact ASTM International () for the latest information. Designation: D – 97 An American National Standard British Standard ASTM-D No. de Acido Por Color – Download as PDF File .pdf), Text File .txt) or read online. 1 Dec Purchase your copy of ASTM D – 14E2 as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards.

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Strong acidic components are referred to as SAN. It is also sometimes used as a measure of lubricant degradation in service; however, any condemning limits astm d974 be empirically established. It is best astm d974 to compare only results from the same test for trending purposes.

The purpose of this article is to astm d974 to answer the following questions: This test is used on new oils and oils that are not astm d974 dark. No general relationship between bearing corrosion and acid or base numbers is known.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

By trending results from one specific test astm d974, additive depletion astm d974 contamination can be detected. Figure 1 shows the underlying components that affect the AN during lubricant aging. A disposable burette is used to titrate the KOH.

Linear trends are for some ester-based synthetics and oils going through oxidation. Repeatability can be astm d974 on a modified test. The relative amount of these materials can be determined by titrating with acids or bases.


ASTM D – 14E2 – Standard Test Method for Acid and Base Number by Color-Indicator Titration

AN has a better ability than pH axtm detect and monitor weak astm d974, which do not readily dissociate in water. For example, one such kit uses a volume-sampling syringe to ensure that the oil samples are the same size. Once the acidic constituents have been astm d974 by the KOH, the sample will change from orange to blue-green, indicating the end point.

It represents the linear oxidation of the base oil.

A Comprehensive Look At the Acid Number Test

No other units of measurement are included in this standard. Some additives are weakly acidic and can elevate the oil’s initial AN. Note 3—Oils, such astm d974 many cutting oils, rustproofing oils, and similar compounded oils, or excessively dark-colored oils, that cannot be analyzed for acid number by this test method due to astm d974 of the color-indicator end astm d974, can be analyzed by Test Method D By focusing on the precision of one lab or test procedure, a trend emerges.

Asfm also plays a major role. Table 1 lists common acids that can be detected. The combined effects of additive depletion, acidic contamination and other acidic-affecting events create a challenge in determining what the AN represents.

The AN remains constant during the additive depletion induction phase. Dos and Don’ts of Comparing Results Comparing results between samples can astm d974 complicated if proper control is not used.

A Comprehensive Look At the Acid Number Test

A change in the acid concentration of an oil can originate from multiple sources. Once these questions are answered, a better understanding of how to use AN results will be achieved. Oils, astm d974 as many cutting oils, astm d974 oils, and similar compounded oils, or excessively dark-colored oils, that cannot be analyzed for acid number by this test method due to obscurity of the color-indicator end point, can be analyzed by Test Method D Acidic contaminants, wrong oil, alkaline-reserve depletion and oxidation by-products can cause an increase in acid concentration.


Once the color has changed, the user only can read the acid number from the burette. The acid numbers obtained by this color-indicator test method need not be numerically the same as those obtained by Test Method Dthe base numbers obtained by this color indicator test method need not be astm d974 the same as those obtained by Test Method Astm d974but they are generally of the same order of magnitude.

For example, if a mean AN was 0. How is AN trended and what are the common trends? What are the advantages astm d974 disadvantages of each astm d974 reproducibility, repeatability, etc. Field tests can also report actual results.

This confirms that comparing results from astm d974 single lab or test procedure is best. Test Method D can be used for this purpose.

Verify which v974 has analyzed the lubricant and the test used. AN is an important tool in astm d974 oil analysis industry when used properly. Referenced Documents purchase separately The documents listed below are referenced within the subject standard astm d974 are not provided as part of the standard. Ensure a representative sample is provided to the lab.