Reading Test Results
From time to time you and we run across a competitive product brochure or an OEM (Original Equipment Manufacturer) requirement with test methods that do not follow the standard ASTM (American Society for Testing and Materials) nomenclature or results. There are a number of different standards in place such as: the German DIN (Deutsche Industrie Norm), ISO (International Organization for Standardization), and SASO (Saudi Standards. Metrology and Quality, Org) to name a few. This makes reading test results, especially for those who don’t do this on a regular basis more difficult than strictly necessary.
Most of these standards use the same methodology. In other words, they run the same test under the same conditions, temperatures, and procedures but call it by a different name and publish the results in different values. For example, the 4 Ball EP test result according to ASTM D 2596 could be 620kg (kilograms). The same result according to the DIN test would be around 6200 N (Newtons). The most common specification besides ASTM is the DIN specifications.
Several common tests
Here is a chart of a few of the most common tests run but this is by no means a complete list:
|Description of the test
|Mass per volume, i.e. 0.945 gm/ml.
|The lowest temperature that vapors from a product will ignite when exposed to a flame.
|The residue of a compound after combustion, Engine oils and Industrial oils report Sulfated Ash.
|Measure of resistance to flow in centistokes (cSt).
|The ability of oil to separate from water.
|The number of milligrams of potassium hydroxide required to neutralize the free acids in an oil.
|The lowest temperature that an oil will flow.
|The rate of viscosity change as the temperature changes. The higher the Viscosity Index the less the change.
|Amount of oil loss at elevated temperature over a specified time.
|Determination of how well an oil releases air.
|Determination of when the grease thickener melts or the oil separates and drops.
|Method to determine the consistency of a lubricating grease.
|50 018, part 1
|Determination of the internal resistance of a grease to shearing at a given temperature.
|Corrosion protection of non-ferrous metals.
|The ability of a lubricant to resist oxidation.
|51 807, part1
|Water Spray off
|The ability of a grease not to emulsify and float away in a static test.
|Determination of oil bleed from a grease.
|Four Ball EP Weld
|The load carrying determination for a grease using point contacts. Reported as kg’s per ASTM and N (newtons) per DIN.
Do you have a question about reading test results or do you want us to “translate” these for you, please contact us.
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