Want this as a site license? Changes from the previous issue A redline edition is available for this document, with all changes visible. Ask Document Center Inc. Scope 1. For higher temperatures Test Method D should be used.

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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. For higher temperatures TestMethod D should be used. No other units of measurement are included in thisstandard. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.

For specific hazardstatements, see 6. Referenced Documents2. Other ingredients arecommonly included to impart special properties. The generalrequirements are that the solid particles are extremely small,uniformly dispersed and capable of forming a relatively stable,gel-like structure with the liquid lubricant. When the first drop ofmaterial falls from the cup, the temperature of the grease testcup and the bath temperature are averaged and recorded as theresult of the test.

Summary of Test Method4. The temperature at which material falls from the hole inthe bottom of the cup is averaged with the temperature of theoil bath and recorded as the dropping point of the grease.

Significance and Use5. This change in state is typical of greasescontaining as thickeners soaps of conventional types. Current edition approved April 15, Published July Originallyapproved in Last previous edition approved in as D— In the IP, this test method is under the jurisdiction of the StandardizationCommittee. This test method has been adopted for use by government agencies to replaceMethod of Federal Test Method Standard No.

United States1containing as thickeners materials other than conventionalsoaps can, without change in state, separate oil.

This testmethod is useful to assist in identifying the grease as to typeand for establishing and maintaining bench marks for qualitycontrol.

The results are considered to have only limitedsignificance with respect to service performance as droppingpoint is a static test. In caseswhere results differ, there is no known significance. However, agreementbetween producer and consumer as to the test method used is advisable.

The depth ofthese indentations shall be such as to support the grease cup atabout the point shown in Fig. Warning—The fluid for the oil bathmust have a flash point in excess of the maximum temperatureat which the bath is to be used5and allowance must be madefor thermal expansion to prevent overflow. Heating is prefer-ably done by an immersed electrical-resistance heater regulatedby voltage control. An open flame must not be used as theheating source. Warning —When a hot plate is used, caremust be taken to avoid spilling oil on the hot surface.

When any abnormal conditions arenoted, obtain a new sample. Preparation of Apparatus8. Vapor harmful. When the interior plating of the cup showsindications of wear, discard. To check the bottomopening a 2.

Iftoo large, discard. Inspect thetube for evidence of chipping or cracking, particularly thepoints of indentation. Replace when necessary. Dow Corning is a registered trademark of the DowCorning Corp.

NOTE 1—Dimensions in millimetres. Total clearance between the cork ringguide and the inside wall of the test tube is 1. Wheneither cork is abnormal, replace. Clean if there is any residue build-up. Remove excess grease with a spatula. Gently press the cup,held in a vertical position with the smaller opening at thebottom, down over the metal rod until the latter protrudes about25 mm. Press the rod against the cup in such a manner that therod makes contact at both upper and lower peripheries of thecup.

Maintain this contact, rotating the cup on the rod along theindex finger to give a spiral-like motion down the rod toremove a conical section of the grease which adheres along therod. As the cup approaches the end of the rod, carefully slip therod out of the cup so that a smooth film, free of air bubbles andof reproducible thickness, remains inside the cup. See Fig. With the thermometer depth gage inposition in the test tube, adjust the position of the upper cork onthe thermometer so that the thermometer bulb bottoms snuglyin the depth gage.

Observe the relative position of the top edgeof the upper cork to the thermometer stem as well as therelative position of the top edge of the test tube to the cork. Care must be taken to be certain that the thermometer isinserted to the same depth when the apparatus is reassembledwith the grease cup in position.

When properly inserted, the bulb of the thermom-eter does not touch either the grease sample or the cup. This should leave the test tube rim at least 6 mm above theoil level. This condition is established when the oil bath is heated at arate of about 1 to 1. As the temperature increases,material will gradually protrude through the orifice of theNOTE 1—Dimensions in millimetres. When a drop of material falls, note the tempera-tures on the two thermometers and record their average to thenearest degree as the dropping point of the grease.

NOTE 2—Certain greases form a drop with a tailing thread uponmelting, which can break off or which can hold until the drop reaches thebottom of the test tube; in any case, the observed dropping point is thetemperature when the drop reaches the bottom of the test tube.

NOTE 3—The dropping points of some greases, particularly thosecontaining simple aluminum soaps, are known to decrease upon aging, thechange being much greater than the deviation permitted in results obtainedby different laboratories. Therefore, comparative tests between laborato-ries should be made within a period of six days.

Precision and Bias The statistical method used todetermine precision is unknown. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn.

Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.


ASTM D566:17

More D This change in state is typical of greases containing as thickeners soaps of conventional types. Greases containing as thickeners materials other than conventional soaps can, without change in state, separate oil. This test method is useful to assist in identifying the grease as to type and for establishing and maintaining bench marks for quality control.







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