ASTM D937 PDF

ASTM D — Roll stability of lubricating grease Covers determination of the changes in the consistency, as measurably cone penetration, of lubricating greases when worked in the roll stability test apparatus. Product search The point of plastic deformation is called the yield point. The sensory expectations of the customer have to be fulfilled. The simple rheology concept of the asstm, short measurement time, and very good repeatability of the results open up a wide application field. The ambient condition that influences the consistency most is the temperature. Looking for a specific close-up?

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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 Department of Defense. The values given in parentheses are for informationonly. 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. Referenced Documents2. The penetration force is deter-mined by the total mass of the cone and shaft. Summary of Test Method4.

The penetration ismeasured with the cone and the sample at this temperatureusing a penetrometer by means of which a standard cone isapplied to the sample for 5 s under a load of g. Significance and Use5. Cone penetration is a means of measuring thefirmness or consistency of petrolatum.

Such measurements areuseful for selecting or specifying, or both, a petrolatum of aparticular consistency or firmness. Cone penetration valuesmay or may not correlate with end-use functional properties. Preparation of Sample7. In the IP, this test method is under the jurisdiction of the StandardizationCommittee.

Current edition approved Nov. Published November Originallyapproved in Last previous edition approved in as D— United States Place the required number of sample containers in theoven along with the sample to bring them up to the sametemperature. Then cover and place thesamples in the water bath for2htobring the temperature to 0. NOTE 2—Some petrolatums containing higher melting point waxes mayrequire higher melting and pouring temperatures.

If no estimate of themelting point is available, ensure that the sample is completely molten appears visually clear before proceeding. A hot plate may be usedinstead of an oven, provided that the sample temperature is carefullymonitored. Watching the shadow of the tip is an aid to accuratesetting.

Finally, quickly release the plunger and hold for 5 Read the total penetration from the scale. Make at leastthree determinations. To prevent one test from being affected by thedisturbed area of a previous test the tip of the cone must not beplaced nearer the edge of a previous test than the penetrationdistance of the sample. Some harder petrolatums tend to forma marked depression in the center on solidifying; such samplesshould not be tested in this depression, as the results obtainedmay be different from those obtained in off-center positions onthe level surface.

Precision and Bias 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.

Permission rights to photocopy the standard may also be secured from the ASTM website www.

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