We perform lubricating grease quality testing by ASTM D, which gives several methods for determining and estimating the makeup of lubricating greases. These test methods for analysis cover greases of the conventional type, which consist essentially of petroleum oil and soap. The constituents that can be. ASTM D standard test methods for analysis of lubricating grease. ASH DETERMINATION 7. General The percentage of ash shall not be included in the.

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NOTE 3 – The determination of the total ash should not in general be regarded as of any great importance. It is, however, sometimes required.

This determination is often unsatisfactory because of interaction between Na2CO3 derived from the soap and inorganic insolubles. There is always likelihood of reaction with the porcelain crucible itself on account of the long continued heating necessary to burn off all carbon.

Moreover, if much Na2CO3 or K2CO3 is present, the ash is fusible and often encloses carbon, making complete removal of the latter very asmt. Results f128 always be low in the presence of easily reducible oxides of volatile metals. Ash determinations made on the same sample in different laboratories are likely to vary widely.


Rapid Routine Test Method 8.

If lead or zinc soap is known to be absent, a platinum crucible is more convenient. Slowly burn off the combustible matter, and finally ignite the residue until the ash is free of carbonaceous matter. Cool the crucible and contents in a desiccator and weigh, reporting the result as percentage of ash.

Alternative Test Method 9.

ASTM D standard test methods for analysis of lubricating grease – YONGRUN

Contact with organic material may cause fire. May be fatal if swallowed. Liquid and vapor cause severe burns. Contact with water liberates large amounts of heat running the acid in carefully from a pipet inserted under a small watch glass covering the crucible.

Warm the crucible and contents on a steam bath until effervescence has ceased. Rinse the watch glass with water into the crucible.

ASTM D – 98()E1 – Standard Test Methods for Analysis of Lubricating Grease

The solution, when tested with methyl red Warning – Flammable. Avoid skin contact or ingestion for free acidity, shall show free acid present. Evaporate the contents of the crucible to ast and ignite the whole at a low red heat, adding a few small pieces of dry NH4 2CO3 Warning – Harmful if swallowed to drive off the excess SO3. After cooling and weighing, report the result as percentage of ash as sulfates.


ASTM D128 – 98(2014)E1

NOTE 4 – This test method gives more concordant results than the routine method Section 8but it requires more time and manipulation. Lithium is indicated by a white infusible ash, readily soluble in water, giving a strongly awtm solution.

A white infusible ash, practically insoluble in water but imparting to it an alkaline reaction, may indicate calcium, with or without magnesium or aluminum. Zinc is shown by the yellow color of the ash while hot, and lead may be indicated by the aastm of metallic globules or by the yellow color of the ash when cold.

May be harmful if swallowed. Confirm the presence of the several bases by suitable chemical tests, following any standard scheme of qualitative analysis. If only one base is present, a quantitative determination is, in general, unnecessary.

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