This standard is issued under the fixed designation D ; the number 1 This test method is under the jurisdiction of ASTM Committee D on Rubber. ASTM D Standard Test Method for Rubber Property—International Hardness. Buy ASTM D – 18 Standard Test Method for Rubber Property—International Hardness from SAI Global.
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Defense manufacturing is all about project manufacturing and project accounting. The hardness is obtained by the difference in penetration depth of a specified dimension ball under two conditions of contact with the rubber: My understanding is that the difference can be larger for a lossy rubber such as NBR than for a more resilient rubber such as NR, but again not as high as reported here.
Register now while it’s still free! If something is amiss I think it may well be with the quality of the D test RE: Close this window and log in. For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values.
Material 1 and Material 2 should be the same.
D Type M micro-hardness testing Thanks Tom for the insight! Join your peers on the Internet’s largest technical engineering professional community. D Type M micro-hardness testing First off, thank you for your input! Cobbold Both H W Wallace.
Students Click Here Join Us! I have had some O-rings tested at two different labs. Readings may not be comparable when testing curved or irregularly shaped test specimens. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. In this case which test should one believe?
D Type M micro-hardness testing 3. Historical Version s – view previous versions of standard.
The Eng-Tips staff will check this out and take appropriate action. This curve is defined as follows:. D Type M micro-hardness testing 3 thread Forum.
ASTM D – 18 Standard Test Method for Rubber Property—International Hardness
If something is atm I think it may well be with the quality of the D test. Red Flag This Post Please let us know here why this post is inappropriate. Material is NBR rubber.
The differential penetration is taken at a specified time and converted to a hardness scale value.
Are you an Engineering professional? Obviously an asmt case will be the rapid fall when unvulcanised rubber is tested. I think it depends on what what specification or requirements you’re trying to meet, or what the customer wants.
I think it’s like tear strength; there are several different test methods e. Thanks Again Pat RE: It is easy to find on the web.
Thank you for any and all tips! Historical Version s – view previous versions of standard Translated Version s: D Type M micro-hardness testing Thank you stancom for the suggestion!
Something I should have included before: The D results from both labs matched however the D test results varied.