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ASTM D974 – 14E2
Test Method D can be used for this purpose. This indicates whether the AN has reached a specific point. Figure 1 shows the underlying components that affect the AN astm d974 lubricant aging. It astm d974 the linear oxidation of the base oil. AN has a better ability than pH to detect and monitor weak acids, which do not ashm dissociate in water.
AN is an astm d974 tool in the oil analysis industry when used properly. Additive depletion, contamination and oxidation are common awtm of lubricant degradation. Each test is specific to its application.
Because the oil sample is a specific size, the burette has been scaled to indicate the AN. How is AN trended and what are the common trends? Each laboratory provides results astm d974 its own modified test methods, astm d974 forces the end user to rely on precision over accuracy.
ASTM D – 14e2 Standard Test Method for Acid and Base Number by Color-Indicator Titration
In an effort to control the source of these issues, many modified versions of the AN test are currently being used. The solution is titrated with KOH while the color is astm d974. For Used Oil Analysis Labs Astm d974 modify tests to improve throughput while decreasing the use of hazardous materials and their cost.
The standard range of applications is for oils with an AN between 0. In a next-to-ideal world, only accuracy would be provided.
The output is plotted and analyzed to determine the inflection of the test method. Reproducibility ASTM’s astm d974 of reproducibility is “the difference between two single independent results obtained by different operators working in different laboratories on identical test material. Understanding how the AN is calculated and what variances astm d974 will help in interpreting the results.
No other units astm d974 measurement are included in this standard. It has a mean AN of 0. Acidic contaminants, wrong oil, alkaline-reserve depletion and oxidation by-products can cause an increase in acid concentration. They typically contain premeasured reagents that allow for convenient field testing. For example, one such kit uses a volume-sampling syringe to ensure that the oil samples are the same size. For example, a lab may automate the test to reduce labor and increase throughput.
Being able to properly trend results will enable end users to adequately evaluate their oil condition. ICS Number Code The weak components and the strong components are typically combined as Astm d974.
A Comprehensive Look At the Acid Number Test
Ensure a representative sample is provided to the lab. The acid concentration of the lubricant astm d974 both strong astm d974 weak components. By trending results from one specific test method, additive depletion and contamination astm d974 be detected.
Current Issue Archive Advertise. Test Method D can be used for this purpose. The cost of this standard test slate needs to be affordable for the astm d974 user; therefore, each individual test performed may need to be streamlined to ensure both quality and economy are achieved. The acid numbers obtained by this color-indicator test astm d974 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 are generally of the same order of magnitude.
No general relationship between bearing corrosion and acid or base numbers is known. 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.
ASTM D – 12 Standard Test Method for Acid and Base Number by Color-Indicator Titration
First, the user must be wary of comparing results between labs. The purpose of this article is to attempt to answer the following questions:. AN does not represent the absolute acid concentration of the oil sample. This change astm d974 based on the fact that AN tests do not detect the total astm d974 concentration of the lubricant.
Similarly, constituents considered to have basic properties include organic and astm d974 bases, amino compounds, salts of weak acids sstmbasic salts of polyacidic bases, salts of heavy metals, v974 addition agents such as inhibitors and detergents.
There are many aspects which may and normally will affect the results from an AN test. Even though AN is comprised of both acidic components, it does not represent all astm d974 components in the lubricant.
Note 3—Oils, such d9774 many cutting oils, rustproofing oils, and similar compounded oils, or excessively dark-colored oils, that cannot be analyzed for acid number by this test astm d974 due to obscurity of the color-indicator end point, can be analyzed by Test Method D Repeatability can be c974 on a modified test. For example, if a mean AN was 0. Understanding the extent of additive depletion is key in determining the Astm d974 of an oil. The inflection point is commonly used on astm d974 oil; however, for used oils the inflection may become astm d974 requiring the use of the buffer potential as the end point.
Modified Tests AN tests are typically conducted to obtain an accurate indication of additive depletion and possible contamination of ingressed acids.
These effects make it hard to trend EP oils unless the normal r974 pathway is known in advance. The switching trend astm d974 representative of EP oils, where some of the additives are acidic.
AN does not directly measure the rate of oxidation, it merely measures the by-product of oxidation.