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. Find the most up-to-date version of ASTM D at Engineering IRHD Hardness – ASTM D IRHD: International Rubber Hardness Degrees. A measure of the indentation resistance of elastomeric or rubber materials.
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Cobbold Both H W Wallace.
D Type M micro-hardness testing Thanks Tom for the insight! I agree with much of tom’s comments but I am surprised that the difference between the two instruments is 10 numerical units or even greater. The Astmm results from both labs matched however the D test results varied. Join your peers on the Internet’s largest technical engineering professional community. I’m new to the rubber scene so any help is appreciated! Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Secondly, Since method D shows both samples to be 70 durometer could the varying results using method D be caused by a difference in compression set, since the method is dependent on time?
Are the results even comparable in the same scale? If something is amiss I think it may well be with the quality of the D test. In this case which asttm should one believe?
IRHD Hardness – ASTM D1415
Morgans University of Greenwich. This curve is defined as follows:.
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ASTM D – 06 Standard Test Method for Rubber Property—International Hardness
Thanks Again Pat RE: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Historical Version s – view previous versions of standard.
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!
Work Item s – proposed revisions of this standard. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
Thank x1415 for any and all tips! D Type M micro-hardness testing Hi, Pat. This curve is defined as follows: The Eng-Tips staff will d415 this out and take appropriate action. For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values. 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.
If something is amiss I think it may ast, be with the quality of the D test RE: Obviously an extreme case will be the rapid fall when unvulcanised rubber is tested.
ASTM D vs. D Type M micro-hardness testing – Rubber engineering – Eng-Tips
Something I should have included before: Material is NBR rubber. D Type M micro-hardness testing Thank you stancom for the suggestion! Click Here to join Eng-Tips and talk with other members! Material 1 and Material 2 should be the same. Readings may not be comparable when testing curved or irregularly shaped test specimens. The differential penetration is taken at a specified time and converted to a hardness scale value.
First off, thank you for your input!
It’s easy to join and it’s free. The hardness is obtained by the difference in penetration depth of a specified dimension ball under two conditions of contact with the rubber: Close this window and log in.
Are you an Engineering professional? However, relaxation is not the only factors at play. I have had some O-rings tested at two different labs. Resources Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor.
Could anyone better explain the differences between the two? D Type M micro-hardness testing 3. It is easy to find on the web. D Type M micro-hardness testing ” D Type M micro-hardness testing 3 thread Forum.