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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Something I should have included before: I’m new to the rubber scene so any help is appreciated! The measured penetration is converted into IRHD, the scale of degrees being so chosen that 0 represents a material having an elastic modulus of zero, and represents a material of infinite elastic modulus.
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In this case which test should one believe? Click Here to join Eng-Tips and talk with other members!
I think it’s like tear strength; there are several different test methods e. This curve is defined as follows: First off, thank you for your input!
D Type M micro-hardness testing Hi, Pat.
Could anyone better explain the differences between the two? Students Click Here Join Us! For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values. Download Now The Architecture, Engineering and Construction AEC industry astj constantly looking for process improvements to better manage potential project delays and costs.
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. The tip of the asttm 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. Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Thanks Again Pat RE: Material is NBR rubber. Register now while it’s still free! It’s easy to join and it’s free. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. 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.
Such issues are the result of project complexity, size, uniqueness and regulation, as well as the need for virtual team collaboration. D Type M micro-hardness testing Thank you stancom for the suggestion! D Type M micro-hardness testing First off, thank you for your input! The Eng-Tips staff will check this out and take appropriate action. D Type M micro-hardness testing ” 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.
If something is amiss I think it may well be with the quality of the D test RE: 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.
Join your peers on the Internet’s largest technical engineering professional community. By joining you are opting in to receive e-mail. The Architecture, Engineering and Construction AEC industry is constantly looking for ast improvements to better manage potential project delays and costs.
I have had some O-rings tested at two different labs. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. The D results from both labs matched however the D test results varied.