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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Promoting, selling, v1415, coursework and thesis posting is forbidden. 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.

In this case which test should one believe? Historical Version s – view asgm versions of standard Work Item s – proposed revisions of this standard Translated Version s: I agree astn much of tom’s comments but I am surprised that the difference between the two instruments is 10 numerical units or even greater.

First off, thank you for your input! Material 1 and Material 2 should be the same. However, relaxation is not the only factors at play. 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. I’m new to the rubber scene so any help is appreciated!


Something I should have included before: The differential penetration is taken at a specified time and converted to a ast, scale value. If something is amiss I think it may well be with the quality of the D test. The D results from both labs matched however the D test results varied.

Click Here to join Eng-Tips and talk with other members! Join your peers on the Internet’s largest technical engineering professional community. Are the results even comparable in the same scale? Download Now The Architecture, Engineering and Construction AEC industry is constantly looking for astk improvements to better manage potential project delays and costs.

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Do not regsrd both as durometer. Material is NBR rubber.

ASTM D – 18 Standard Test Method for Rubber Property—International Hardness

D Type M micro-hardness testing Hi, Pat. I have had some O-rings tested at two different labs. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. D Type M micro-hardness testing Thank you stancom for the suggestion! It’s easy to join and it’s free.

IRHD Hardness – ASTM D1415

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D Type M micro-hardness testing ” Are you an Engineering professional? D Type M micro-hardness testing Thanks Tom for the insight! Thank you for helping keep Eng-Tips Forums free from inappropriate posts. For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values. This curve is defined as follows:.

I think it’s like tear strength; there are several different test methods e. Could anyone better explain the differences between the two? Readings may not be comparable when testing curved v1415 irregularly shaped test specimens.

Cobbold Both H W Wallace. 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.

It is easy to find on the web. Link to Active This link will always route to the current Active version of the standard.