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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NLGI Member Only Content – Technical Article
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. This means that a quarter of all tests commonly performed throughout the industry for 28 days will likely show false d2489. What this approach fails to address are the interactions between an actual polymer material and the specific formula of d4829 given fluid — including a host of additives and contaminants that often go unaccounted for but significantly alter the equation.
However, they can be correlated in many instances.
Chemical Compatibility Study Reveals Shortfalls in Standard Testing Methods
Theoretical models that have been established to predict fluid compatibility are based largely on the laws of chemistry. Standards Subsctiption may be the perfect solution. Ultimately, all the relevant properties must asm evaluated by an engineer, who might find the need to include additional calculations to account for changes in mechanical properties.
Inasmuch as the precision values apply only to the elastomers specified in Annex A1 of Test Method Dwhen a lubricant specification asmt some other elastomer, the user and supplier of the lubricant should agree to the values of acceptable precision.
Even when exposure times aastm sufficiently long, the evaluations might be limited to measuring changes in only volume and hardness. Even in a thorough compatibility program, performance can only be inferred.
ASTM D – Standard Test Method for Elastomer Compatibility of Lubricating Greases and Fluids
Add to Alert PDF. Emulsions at higher r4289, for example, tended to demulsify, and biodegradable fluids acidified. For ASTM D, used for automotive greases, a limited number of property changes are recommended for evaluations. In this respect, this test method is useful for lubricant specifications for example, Specification D For specific hazard statements, see Note 6, Note 7, and Note 8.
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 Dthis test method can be used as a guide for evaluating compatibility.
Testing at the System Seals laboratory revealed that some fluid-material combinations that appear compatible at 1, hours later became incompatible after 2, hours. Ast, Subscribed to this document.
Need more than one copy? ASTM D, for instance, typically incorporates tests with a maximum exposure time of 70 hours, which significantly limits long-term predictive capabilities.
We have no amendments or corrections for this standard. For the past several years, System Seals, a research-based seal manufacturer in Cleveland, has undertaken an exhaustive fluid compatibility study that paired more than combinations of seal materials with commonly used industrial fluids. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
During the testing it became necessary to understand how the mechanical properties changed from exposure.
Approximately 25 percent of the material-fluid combinations that successfully passed at the day mark, soon began to fail near or after 60 days.
In such instances, the repeatability and reproducibility values stated in Astmm 12 do not apply, and the user and supplier should agree on acceptable limits of precision.
We have no document history for this standard. For specific warning statements, see 8. Similarly, this test method can be used in specifications for lubricating fluids as well.
D2489 specific warning statements, see 8. The zstm testing consisted of three main components: This should include parameters to accelerate the effects of pressure, temperature and surface finish, as well as motion, such as reciprocating, rotary and swivel. Please first log in with a verified email before subscribing to alerts.
However, they can be correlated in many instances. And in many test recommendations, there are no established guidelines for static or dynamic applications. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. It is recommended that the agreed upon precision values be stated in the user’s lubricant specification.
Such values may or may not be the same as atsm of Test Method D Note The scope of this test method now includes the evaluation of d44289 elastomer compatibility of both lubricating fluids and greases.
Although some guidelines can be used to make engineering decisions, these values could be flexible or rigid, depending on the application.
No other units of measurement are included in this standard.
Norma ASTM D()e1
The times vary considerably among manufactures, usually ranging from a week to 30 days. This was found to be a significant gap in historic testing methods. Testing of fluids was not wstm in Test Method D —95 and earlier versions.
Industry Standard Tests Theoretical models that have been established to predict fluid compatibility are based largely on the laws of chemistry.