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Standard Test Method for Elastomer Compatibility of Lubricating Greases and Fluids
Přeložit název
NORMA vydána dne 15.12.2021
Označení normy: ASTM D4289-21
Poznámka: NEPLATNÁ
Datum vydání normy: 15.12.2021
Kód zboží: NS-1048418
Počet stran: 9
Přibližná hmotnost: 27 g (0.06 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
compatibility, density, elastomer, fluid, grease, immersion, lubricant, lubricating grease, relative, rubber, seal(s),, ICS Number Code 75.100 (Lubricants, industrial oils and related products)
Significance and Use | ||||||||||||||||||||||||||||||||
5.1?Measurement of the changes in the volume and hardness of an elastomer that occur from immersion in a lubricating grease or fluid provides a means for evaluating relative compatibility. Much of this test method was derived from procedures described in Test Method D471 and Federal Test Method 791C/3603.5. In contrast to these two test methods, which emphasize the evaluation of rubber and rubber-like compounds, Test Method D4289 was developed specifically to evaluate lubricating greases and fluids, especially those used in automotive applications, although the test method can be applied to lubricants used in industrial applications as well. Excepting the Shore Durometer A, this test method requires no specialized, rubber-testing equipment. Virtually all other equipment and supplies specified in the procedure are stock items in lubricants laboratories. 5.2?The volume and hardness-change values determined by this test method do not duplicate similar changes that occur in elastomeric seals under actual service conditions. However, they can be correlated in many instances. In one such instance, the volume-change values determined by the antecedent of this test method correlated (5.3?With specifications requiring elastomers other than Reference Elastomers AMS 3217/2C or AMS 3217/3B, coupons cut from standard sheets (Practice D3182) should be used. When the preparation of such coupons is not feasible, or the lubricant specification requires the use of rubber products that do not have a suitable size or configuration for use in preparing coupons for testing (Practice D3183), this test method can be used as a guide for evaluating compatibility. Note 5:?Inasmuch as the precision values apply only to the
elastomers specified in Annex A1 of Test Method D4289, when a lubricant specification
requires some other elastomer, the user and supplier of the
lubricant should agree to the values of acceptable precision. Such
values may or may not be the same as those of Test Method
D4289. It is recommended that
the agreed upon precision values be stated in the user's lubricant
specification.
5.4?The results of this test method are most applicable to the use of lubricating greases and fluids in contact with elastomeric seals, boots, O-rings, and similar products, where the physical demands on the elastomer are not extreme. In critical applications where the lubricant will be in contact with rubber parts subject to severe flexing, extreme temperatures, or similar stresses, other rubber properties, such as tensile strength and elongation, should also be evaluated as they may be more indicative of the true compatibility characteristics. |
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1. Scope | ||||||||||||||||||||||||||||||||
1.1?This test method evaluates the compatibility of lubricating greases and fluids with coupons cut from standard elastomer sheets (Practice D3182). Compatibility is evaluated by determining the changes in volume and Durometer A hardness that occur when elastomer coupons are totally immersed in a lubricant sample for 70 h or for a duration as required by the lubricant specification at either 100 ?C or 150 ?C or at a test temperature as required by the lubricant specification. 1.1.1?Some lubricant specifications may require different elastomers or test conditions, such as longer durations or lower or higher temperatures. In such instances, the repeatability and reproducibility values stated in Section 12 do not apply, and the user and supplier should agree on acceptable limits of precision. Note 1:?The scope of this test method now includes the
evaluation of the elastomer compatibility of both lubricating
fluids and greases. Testing of fluids was not included in Test
Method D428995 and earlier
versions.
1.2?This test method can also be used as a guide to evaluate the compatibility of greases with rubber products not in standard sheet form (Practice D3183). 1.3?The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1?ExceptionWhen listed, Durometer A units shall be regarded as the standard. 1.4?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. 1.5?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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2. Referenced Documents | ||||||||||||||||||||||||||||||||
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