ASTM D4289-13由美国材料与试验协会 US-ASTM 发布于 2013。
ASTM D4289-13 在中国标准分类中归属于: E36 润滑脂。
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 Method8201;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 (r 28201;=8201;0.99) with those that occurred during a vehicle test.7 Because of wide variations in service conditions and differences in grease and elastomer formulations, correlations between the results obtained with this test method and particular applications should be determined on an individual basis.
5.3 When the optional Reference Elastomers AMS 3217/2C (acrylonitrile-butadiene, NBR-L) and AMS 3217/3A (chloroprene, CR) are used to evaluate compatibility, the results can be used to judge a service characteristic of lubricants. In this respect, this test method is useful for lubricant specifications (for example, Specification D4950). Similarly, this test method can be used in specifications for lubricating fluids as well.
5.4 With specifications requiring elastomers other than Reference Elastomers AMS 3217/2C or AMS 3217/3A, 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.5.5 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.
1会议回顾此次会议由石化标委会秘书处介绍重要标准修订趋势,起草人解析标准的制修订背景、原则、依据及标准的主要技术内容,对试验方法标准的适用范围、试验设备和条件、操作步骤和精密度方面进行讲解,对标准使用过程中的常见问题和相关方法的研发应用进行技术交流,会议邀请了行业的专家做了专题报告。...
在这种情况下,润滑脂允许工作人员在较低的接触压力和较低弹性体压缩状态下进行工作。对密封表面的粗糙度要求也没那么严格了。一个非常典型的例子便是使用硅润滑脂对磨砂玻璃接缝进行密封,如在化学结构方面的运用,如:“标准”或“锥形磨口连接”。使用高粘性的硅润滑剂时无需任何弹性体密封。由于材料组合的不同,润滑脂还可渗透到弹性体表面中,导致顶层出现轻微的膨胀。这反而有助于对一些参差表面的填充。...
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