We perform testing by ASTM D to evaluate the compatibility of lubricants with elastomers by measuring the changes in an elastomer immersed in lubricant . ASTM D()e1. Standard Test Method for Elastomer Compatibility of Lubricating Greases and Fluids. standard by ASTM. Buy ASTM D TEST METHOD FOR ELASTOMER COMPATIBILITY OF LUBRICATING GREASES AND FLUIDS from SAI Global.
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Industry Standard Tests Theoretical models that have been established to predict fluid compatibility are based largely on the laws of chemistry. Such values may or may not be the same as those of Test Method D Please first log in with a verified email before subscribing to alerts. It is recommended that the agreed upon precision values be stated in the user’s lubricant specification. Higher temperatures were used for specific high-temperature applications.
Your Alert Profile lists the documents that will be monitored. You may delete a document from your Alert Profile at any time. To ensure full saturation, the testing ran for 2, hours, or 12 weeks. And, it is impossible to accurately deduce material changes for one material based on the results of another, even if the materials are in the same family. This significantly extended most of the industry standards, which rely on an average duration of about a month.
This means that a quarter of all tests commonly performed throughout the industry for 28 days will likely show false results. Some of the tests were performed by customer request, while others were conducted to round out the research and record for future use. Please first log in with a verified email before subscribing to alerts. Proceed to Checkout Continue Shopping. An increase in mass might also indicate fluid absorption, and a loss in mass usually indicates chemical degradation.
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Link to Active This link will always route to the current Active version of the standard. Engineering Applications The d4298 purpose of a chemical compatibility program is to evaluate the ability of an elastomer to function as a seal in its intended application when exposed to a working fluid. The scope of this test method now includes the evaluation of the elastomer compatibility of both lubricating fluids and greases. It is axtm responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM D – 03 Standard Test Method for Elastomer Compatibility of Lubricating Greases and Fluids
However, they can be correlated in many instances. The duration times dedicated to the tests are not standardized, nor are they often specified. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Virtually all other equipment and supplies specified in the d2489 are stock items in lubricants laboratories.
Limited exposure times and a lack of application-based testing have created shortfalls that have paved the way for industry-wide acceptance of generalizations about entire d428 families that mistakenly group different materials into single categories, the research found. For example, a dynamic seal may be required to retain more of its original properties than a static seal.
Volume swell is a good indicator of fluid absorption, which is important because many seal grooves d42289 between percent free space available. To fully assess dimensional changes from chemical ageing, other characteristics are monitored as well, such as volume, thickness d42289 density. Proceed to Checkout Continue Shopping. Need more than one copy? Similarly, this test method can be used in specifications for lubricating fluids as well. Results of the extended tests were startling.
ASTM D – Standard Test Method for Elastomer Compatibility of Lubricating Greases and Fluids
The compatibility testing consisted of three main components: Still, there are considerable inconsistencies among these tests. Your Alert Profile lists the documents that will be monitored.
Fluid incompatibility is one of the leading causes of seal failure, so when a multi-million-dollar operation becomes dependent on the performance of a group of seals, it is critical that the testing is sufficient, accurate and complete, and that the operator has confidence that the seal system will perform to its greatest ability. During the testing it became necessary to understand how the mechanical properties changed from exposure.
In such instances, the repeatability and reproducibility values stated in Section 12 do not apply, aetm the user and supplier should agree on acceptable limits of precision.
You may delete a document from your Alert Profile at any time. Inasmuch as the precision values apply only to the elastomers specified in Annex A1 of Test Method Dwhen a lubricant specification requires some other elastomer, the user and supplier of the lubricant should agree to the values of acceptable precision.
Most test standards also do not incorporate changes in the transition temperature, which is critical for low-temperature applications. What this approach fails to address are the interactions between an actual polymer material and the specific formula of a given fluid — including a host of additives and contaminants that often go unaccounted d4298 but significantly alter the equation.