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ASTM D6185-11(2017)
Standard Practice for Evaluating Compatibility of Binary Mixtures of Lubricating Greases
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NORM herausgegeben am 15.12.2017
Informationen über die Norm:
Bezeichnung normen: ASTM D6185-11(2017)
Ausgabedatum normen: 15.12.2017
SKU: NS-807821
Zahl der Seiten: 9
Gewicht ca.: 27 g (0.06 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Kategorie - ähnliche Normen:
Die Annotation des Normtextes ASTM D6185-11(2017) :
Keywords:
binary mixtures, compatibility, incompatibility, lubricating grease, mixtures,, ICS Number Code 75.100 (Lubricants, industrial oils and related products)
Ergänzende Informationen
| Significance and Use | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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5.1 The compatibility of greases can be important for users of grease-lubricated equipment. It is well known that the mixing of two greases can produce a substance markedly inferior to either of its constituent materials. One or more of the following can occur. A mixture of incompatible greases most often softens, sometimes excessively. Occasionally, it can harden. In extreme cases, the thickener and liquid lubricant will completely separate. Bleeding can be so severe that the mixed grease will run out of an operating bearing. Excessive syneresis can occur, forming pools of liquid lubricant separated from the grease. Dropping points can be reduced to the extent that grease or separated oil runs out of bearings at elevated operating temperatures. Such events can lead to catastrophic lubrication failures. 5.1.1 Because of such occurrences, equipment manufacturers recommend completely cleaning the grease from equipment before installing a different grease. Service recommendations for grease-lubricated equipment frequently specify the caveat–5.2 There are two approaches to evaluating the compatibility of grease mixtures. One is to determine whether such mixtures meet the same specification requirements as the constituent components. This approach is not addressed by this practice. Instead, this practice takes a specification-independent approach; it describes the evaluation of compatibility on a relative basis using specific test methods. 5.2.1 Three test methods are used because fewer are not sufficiently definitive. For example, in one study, using 100 000-stroke worked penetration for evaluation, 62 % of the mixtures were judged to be compatible.5 In a high-temperature storage stability study, covering a broader spectrum of grease types, only one-third of the mixtures were compatible.5.2.2 Compatibility cannot be predicted with certainty from foreknowledge of grease composition. Generally, greases having the same or similar thickener types will be compatible. Uncommonly, even greases of the same type, although normally compatible when mixed, can be incompatible because of incompatible additive treatments. Thus, compatibility needs to be judged on a case-by-case basis. 5.3 Two constituent greases are blended in specific ratios. A 50:50 mixture simulates a ratio that might be experienced when one grease (Grease A) is installed in a bearing containing a previously installed, different grease (Grease B), and no attempt is made to flush out Grease B with Grease A. The 10:90 and 90:10 ratios are intended to simulate ratios that might occur when attempts are made to flush out Grease B with Grease A. Note 1: Some companies evaluate 25:75 and 75:25 ratio mixtures
instead of 10:90 and 90:10 ratio mixtures. But, the latter two
ratios, which are prescribed by this practice, are considered more
representative of the flushing practice described in 5.3.
5.3.1 Incompatibility is most often revealed by the evaluation of 50:50 mixtures. However, in some instances 50:50 mixtures are compatible and more dilute ratios are incompatible. (See Appendix X1 and Meade.5.4 Compatibility information can be used in product information literature supplied with specific greases. It can be used also in literature describing lubrication practices and equipment maintenance. |
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| 1. Scope | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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1.1 This practice covers a protocol for evaluating the compatibility of one or three binary mixtures of lubricating greases by comparing their properties or performance relative to those of the neat greases comprising the mixture. 1.2 Three properties are evaluated in a primary testing protocol using standard test methods: (1) dropping point by Test Method D566 (or Test Method D2265); (2) shear stability by Test Methods D217, 100 000–stroke worked penetration; and (3) storage stability at elevated-temperature by change in 60-stroke penetration (Test Method D217). For compatible mixtures (those passing all primary testing), a secondary (nonmandatory) testing scheme is suggested when circumstances indicate the need for additional testing. 1.3 Sequential or concurrent testing is continued until the first failure. If any mixture fails any of the primary tests, the greases are incompatible. If all mixtures pass the three primary tests, the greases are considered compatible. 1.4 This practice applies only to lubricating greases having characteristics suitable for evaluation by the suggested test methods. If the scope of a specific test method limits testing to those greases within a specified range of properties, greases outside that range cannot be tested for compatibility by that test method. An exception to this would be when the tested property of the neat, constituent greases is within the specified range, but the tested property of a mixture is outside the range because of incompatibility. 1.5 This practice does not purport to cover all test methods that could be employed. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 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.
Standard Test Method for Evaporation Loss
of Lubricating Greases and Oils Standard Test Method for Measuring
Apparent Viscosity of Lubricating Greases Standard Test Method for Leakage
Tendencies of Automotive Wheel Bearing Greases Standard Test Method for Determining the
Water Washout Characteristics of Lubricating Greases (Includes all
amendments and changes 2/7/2020). Federal Test Method 3467.1 (Standard 791C), Storage Stability of
Lubricating Grease Available from Standardization Documents Order
Desk, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA
19111-5094, Attn: NPODS. Standard Test Method for Low-Temperature
Torque of Ball Bearing Grease Standard Test Method for Oil Separation
from Lubricating Grease During Storage Standard Test Method for Life of
Lubricating Greases in Ball Bearings at Elevated Temperatures
(Includes all amendments and changes 11/11/2020). Standard Test Method for Determining Life
and Torque of Lubricating Greases in Small Ball Bearings Standard Test Method for Life Performance
of Automotive Wheel Bearing Grease Standard Test Method for Determining the
Resistance of Lubricating Grease to Water Spray Standard Test Method for Fretting Wear
Protection by Lubricating Greases Standard Terminology Relating to
Petroleum Products, Liquid Fuels, and Lubricants (Includes all
amendments and changes 12/21/2023). Standard Test Method for Determining the
Leakage Tendencies of Automotive Wheel Bearing Grease Under
Accelerated Conditions Standard Test Method for Measurement of
Extreme-Pressure Properties of Lubricating Grease (Four-Ball
Method) Standard Test Method for Oil Separation
from Lubricating Grease by Centrifuging (Koppers Method) Standard Test Method for Low-Temperature
Torque of Grease-Lubricated Wheel Bearings Standard Classification and Specification
for Automotive Service Greases Standard Test Method for Determining
Extreme Pressure Properties of Lubricating Greases Using a
High-Frequency, Linear-Oscillation (SRV) Test Machine Standard Test Method for Measuring
Friction and Wear Properties of Lubricating Grease Using a
High-Frequency, Linear-Oscillation (SRV) Test Machine Standard Test Method for Dropping Point
of Lubricating Grease Over Wide Temperature Range Standard Test Method for Wear Preventive
Characteristics of Lubricating Grease (Four-Ball Method) Standard Test Method for Measurement of
Load-Carrying Capacity of Lubricating Grease (Timken Method)
(Includes all amendments and changes 3/23/2021). Standard Test Method for Evaporation Loss
of Lubricating Greases Over Wide-Temperature Range Standard Test Method for Roll Stability
of Lubricating Grease Standard Test Method for Determining
Corrosion Preventive Properties of Lubricating Greases Standard Test Methods for Cone
Penetration of Lubricating Grease Using One-Quarter and One-Half
Scale Cone Equipment (Includes all amendments and changes
9/7/2020). Standard Test Methods for Cone
Penetration of Lubricating Grease (Includes all amendments and
changes 12/20/2021). Standard Test Method for Dropping Point
of Lubricating Grease (Withdrawn 2023) |
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