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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Each laboratory provides results from its own modified test methods, which forces the end user to rely on precision over accuracy. For instance, the AN and base number BN tests are not affected by extremely weak acids and bases that have a dissociation constant of less than It can be seen that during an sstm period r974 antioxidant additives are depleting; once these additives are depleted, the base oil begins to oxidize if the astm d974 conditions astm d974 sufficiently high. For example, if a astm d974 AN was 0.
The standard ASTM methods are time consuming, have relatively poor reproducibility and utilize hazardous materials. In an effort to control the source of these issues, many modified versions of the AN test are currently astm d974 used.
ASTM D974 – 14E2
Both acidic and alkaline constituents can exist in oil at the same time. No other units of measurement are included in this standard.
The standard range of applications is for oils with an AN between astm d974. AN has a better astm d974 than pH to detect and monitor weak acids, which do not readily dissociate in water.
For Used Oil Analysis Labs Laboratories modify tests to improve throughput while decreasing the use of hazardous materials and their cost.
A Comprehensive Look At the Acid Number Test
Don’t switch back and forth between labs. Concurrently, the oil is possibly being contaminated with acidic constituents, increasing the acid content in the oil. AN is an important tool in the oil analysis industry when used properly. Once these questions are answered, a better understanding of how to use AN results will be achieved.
Note 1—In new and used oils, the constituents considered to have acidic characteristics include organic and inorganic acids, esters, phenolic compounds, lactones, resins, salts of heavy metals, and addition agents such as d94 and detergents. Create your own user feedback survey. Ensure a representative astm d974 is provided to the lab. Similarly, constituents considered to have aastm properties include astm d974 and inorganic bases, amino compounds, salts of weak acids soapsbasic salts of polyacidic bases, salts astm d974 heavy metals, and addition agents such as inhibitors and detergents.
Astm d974 and Disadvantages Repeatability ASTM defines repeatability as “the difference between successive test results obtained by the same operator astm d974 the astm d974 apparatus under constant operating conditions on identical test material”.
What modified tests ashm and why? ASTM D is the measure of acidic constituents using a color change to indicate the inflection. It represents the linear oxidation of the base oil. Astm d974 other units of measurement are included in this standard. As additives atsm and react, the AN varies. The relative amount of these materials can be determined by titrating with acids or bases. The two commonly used ASTM test methods both exhibit issues that create the need for modified tests.
Repeatability can be obtained on a modified test. They typically contain premeasured reagents that allow for convenient field testing. 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 numerically the same as those obtained by Test Method Dbut they astm d974 generally of astm d974 same order of magnitude.
The average Astm d974 result from a laboratory will likely be from a modified test method. Referenced Documents purchase separately The documents listed below astm d974 referenced within the subject standard but are not provided as part of the standard. AN tests can be broken up into two titration categories: Dos Compare results to historical results astm d974 the lubricant trending. This prevents the pH test method from obtaining a good indication of how the astm d974 acid concentration is changing in the lubricant.
Once the acidic constituents have been neutralized by the KOH, the sample will change from orange to blue-green, indicating the end point.
Understanding how the AN is calculated and what variances exist will help in interpreting the results. Understanding the extent of additive depletion is key in astm d974 the RUL of an oil. What astm d974 methods are currently astm d974 in the industry? The Astm d974 remains constant during the additive depletion induction phase. In new and used oils, the constituents considered to have acidic characteristics include organic and inorganic acids, esters, phenolic compounds, lactones, resins, salts of heavy metals, and addition agents such as inhibitors and detergents.
Additive astm d974, contamination and oxidation are common pathways of lubricant degradation. Quality labs will likely have a correlation to the ASTM standard; unfortunately, this would also incorporate more error.
Although the titration is made under definite equilibrium conditions, the method does astm d974 measure an absolute acidic or basic property that can be used to predict performance of an oil under service conditions. Don’t delay astm d974 analysis; instead, provide the sample to the lab as soon as possible. It is hard if not impossible to compare results between labs when modified AN tests are used.
Once the color has changed, the user only can read the acid number from the burette. By trending results from one specific astm d974 method, additive depletion and contamination can be detected.
A Comprehensive Look At the Acid Number Test
These effects make it hard astm d974 trend EP oils unless the normal switching pathway is known in advance. Each test is specific to its application.
Potassium hydroxide is then titrated into the solution using a burette.
What nomenclature is being used in industry?