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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Chemical Compatibility Study Reveals Shortfalls in Standard Testing Methods – System Seals Inc.
However, they can be correlated in many instances. The ultimate 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.
This significantly extended most of the industry standards, which rely on an average duration of about a month. 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. Even in a thorough compatibility program, performance can only be inferred. Similarly, this test method can be used in specifications for lubricating fluids as well.
Note The scope of this test method now includes the evaluation of the elastomer compatibility of both lubricating fluids and greases. 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 at either or oC or as required by the lubricant specification.
Because some fluids experience chemical changes at higher temperatures, specific temperatures were used to control this. Add to Alert PDF.
ASTM D Standard Method of Testing Compatibility of Lubricating Grease with Elastomers
Need more than one copy? 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 c4289 for but significantly alter the equation. During the testing it became necessary to understand how the mechanical properties ast from exposure.
The company ran chemical compatibility simulations between 60 to 90 days, and in some cases longer. Standards Subsctiption may be the perfect solution. Emulsions at higher temperatures, for example, tended to demulsify, and biodegradable fluids acidified.
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. 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.
It is recommended that the agreed upon precision values be stated in the user’s lubricant specification.
If the document is revised or amended, you will be d42289 by email. Ultimately, all the relevant properties must be evaluated by an engineer, who might find the need to include additional calculations to account for changes in mechanical properties. Volume swell is a good indicator of fluid absorption, which is important because many seal grooves have between percent free space available.
We have no amendments or corrections for this standard.
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You may delete a document from your Alert Profile at any time. For xstm, a dynamic seal may be required to retain more of its original properties than a static seal. The compatibility testing consisted of three main components: To advance the compatibility study, application testing should be performed.
Two HNBRs, for asrm, might demonstrate different property changes depending on the levels of fillers and additives. Virtually all other equipment and supplies specified in the procedure are stock items in lubricants laboratories.
To address these limitations, testing standards have been established to evaluate compatibility. This standard is not included in any packages. Although some guidelines can be used to make engineering decisions, these values could be flexible or rigid, depending on the application.
Chemical Compatibility Study Reveals Shortfalls in Standard Testing Methods
In this respect, this test method is useful for lubricant specifications for example, Specification D Still, aztm are considerable inconsistencies among astmm tests. Traditional methods to determine elastomer seal compatibility with specific fluids have for decades produced misleading results, according to a new research from System Seals Laboratories.
Virtually all other equipment and supplies specified in the procedure are stock items in lubricants laboratories. The base test parameters included volume swell, mass and density changes, hardness, tensile strength, elongation, percent modulus, work function area under tensile curve up to 20 percentcompression set and abrasion resistance.
If the document is revised or amended, you will be notified by email. 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.
Atsm addition to changes in hardness, the tensile modulus needed to be tracked, as well as percent modulus, tensile strength and elongation at break.
An increase in mass might also indicate fluid absorption, and a loss in mass usually indicates chemical degradation. Testing at the System Seals laboratory revealed that some fluid-material combinations that appear compatible at 1, hours later became incompatible after 2, hours.
For ASTM D, used for automotive greases, a limited number of property changes are recommended asym evaluations. The scope of this test method now includes the evaluation of the elastomer compatibility of both lubricating fluids and greases.