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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The hardness is obtained by the difference in penetration depth of a specified dimension ball under two conditions of contact with the rubber: In this case which test should one believe? In my experience, admittedly with the normal test, the difference ought not to exceed 5 units or so even when we recognise the underlying difference in durometer and International Rubber Hardness tests. Material 1 and Material 2 should be the same. I think it depends on what what specification or requirements you’re trying to meet, or what the customer wants.
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Click Here to join Eng-Tips and talk with other members! D Type M micro-hardness testing 3. Do not regsrd both as durometer. Download Now The Architecture, Engineering and Construction AEC industry is constantly looking d4115 process improvements to better manage potential project delays and costs.
D Type M micro-hardness testing Thank you stancom for the suggestion! Are you an Engineering professional? This 1d415 is defined as follows:. First off, thank you for your input! It is easy to find on the web. The Architecture, Engineering and Construction AEC industry is constantly looking for process improvements to better manage potential project delays and costs.
I think it’s like tear strength; there are several different test methods e. If something is amiss I think it may well be with the quality of the D test RE: This curve is defined as follows: Aetm D results from both labs matched however the D test results varied.
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Obviously an extreme case will be the rapid fall when unvulcanised rubber is tested. Link to Active This link will always route to the current Active version of the standard. Something I should have included before: The tip of the indentor takes some time to settle into the depression it makes, eg overcoming drag forces – which one reason for the application of a solid lubricant, usually talc.
Historical Version s – view previous versions of standard. The Eng-Tips staff will check this out d14415 take appropriate action.
Join your peers on the Internet’s largest technical engineering professional community. Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor. I have had some O-rings tested at two different astk.
I’m new to the rubber scene so any help is appreciated! Close this window and log in. D Type M micro-hardness testing Hi, Pat. 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.
For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values. Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Cobbold Both H W Wallace.
Are the results even comparable in the same scale? 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. D Type M micro-hardness testing Thanks Tom for the insight! It is the responsibility of the user of this standard to establish xstm safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
D Type M micro-hardness testing 3 thread Forum. Register now while it’s still free! D Type M micro-hardness testing First off, thank you for your input! The differential penetration is taken at a specified time and converted to a hardness scale value.
D Type M micro-hardness testing 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. X1415 anyone better explain the differences between the two?
IRHD Hardness – ASTM D1415
Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. After reading the ASTM sections the only differences I can come up with are the time dependency and the actual test apparatus.
D Type M micro-hardness testing ” However, relaxation is not the only factors at play. Work Item s – proposed revisions of this standard.
ASTM D vs. D Type M micro-hardness testing – Rubber engineering – Eng-Tips
Such issues are the result of project complexity, size, uniqueness and regulation, as well as the need for virtual team collaboration. Thank you for any and all tips!
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? Thanks Again Pat RE: