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Standard Test Method for Sulfated Ash from Lubricating Oils and Additives
Name übersetzen
NORM herausgegeben am 1.3.2023
Bezeichnung normen: ASTM D874-23
Ausgabedatum normen: 1.3.2023
SKU: NS-1138650
Zahl der Seiten: 5
Gewicht ca.: 15 g (0.03 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
additives, ash, lubricating oils,, ICS Number Code 75.100 (Lubricants, industrial oils and related products)
Significance and Use | ||||||||||||||
5.1?The sulfated ash can be used to indicate the concentration of known metal-containing additives in new oils. When phosphorus is absent, barium, calcium, magnesium, sodium and potassium are converted to their sulfates and tin (stannic) and zinc to their oxides (Note 4). Sulfur and chlorine do not interfere, but when phosphorus is present with metals, it remains partially or wholly in the sulfated ash as metal phosphates. Note 4:?Since zinc sulfate slowly decomposes to its oxide at
the ignition temperature specified in the test method, samples
containing zinc can give variable results unless the zinc sulfate
is completely converted to the oxide.
5.2?Because of above inter-element interferences, experimentally obtained sulfated ash values may differ from sulfated ash values calculated from elemental analysis. The formation of such non-sulfated species is dependent on the temperature of ashing, time ashed, and the composition of metal compounds present in oils. Hence, sulfated ash requirement generally should not be used in product specifications without a clear understanding between a buyer and a seller of the unreliability of an ash value as an indicator of the total metallic compound content.1.1?This test method covers the determination of the sulfated ash from unused lubricating oils containing additives and from additive concentrates used in compounding. These additives usually contain one or more of the following metals: barium, calcium, magnesium, zinc, potassium, sodium, and tin. The elements sulfur, phosphorus, and chlorine can also be present in combined form. 1.2?Application of this test method to sulfated ash levels below 0.02 % by mass is restricted to oils containing ashless additives. The lower limit of the test method is 0.005 % by mass sulfated ash. Note 1:?This test method is not intended for the analysis of
used engine oils or oils containing lead. Neither is it recommended
for the analysis of nonadditive lubricating oils, for which Test
Method D482 can be
used.
Note 2:?There is evidence that magnesium does not react the
same as other alkali metals in this test. If magnesium additives
are present, the data is interpreted with caution.
Note 3:?There is evidence that samples containing molybdenum
can give low results because molybdenum compounds are not fully
recovered at the temperature of ashing.
1.3?Fatty acid methyl ester (FAME) conforming to EN 14213 and EN 14214, when tested using this test method, were shown to meet its precision. 1.4?The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5?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. 1.6?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. |
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2. Referenced Documents | ||||||||||||||
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