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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I think it depends on what what specification or requirements you’re trying to meet, or what the customer wants. Asstm I should have included before: The differential penetration is taken at a specified time and converted to a hardness scale value. D Type M micro-hardness testing First off, thank you for your input!
Historical Version s – view previous versions of standard Translated Version s: Are the results even comparable in the same scale? Register now while it’s still free! Red Flag This Post Please let us know here why this post is inappropriate. Historical Version s – view previous versions of standard. By joining you are opting in to receive e-mail. 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 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.
After reading the ASTM sections the only differences I can come up with are the time satm and the actual test apparatus.
In my experience, admittedly with the normal test, the difference ought not to exceed 5 units or so even asmt we recognise the underlying difference in durometer and International Rubber Hardness tests.
If awtm is amiss I think it may well be with the quality of the D test RE: The hardness is obtained by the difference in penetration depth of a specified dimension ball under two conditions of contact with the rubber: Could anyone better explain the differences between the two? Secondly, Since method D shows both samples to be 70 durometer could the varying results using method D x1415 caused by a difference in compression set, since the method is dependent on time?
If something is amiss I think it may well be with the quality of the D test. Defense manufacturing is all about project manufacturing and project accounting. Join your peers on astmm Internet’s largest aetm engineering professional community. This curve is defined as follows:. Download Now Defense manufacturing is all about project manufacturing and project accounting.
Cobbold Both H W Wallace.
I think asrm like tear strength; there are several different test methods e. D Type M micro-hardness testing Hi, Pat.
Obviously an extreme case will be the rapid fall when unvulcanised rubber is tested. D Type M micro-hardness testing Thank you stancom for the suggestion!
D Type M micro-hardness testing 3 thread Forum. In this case which test should one believe? Resources Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors.
Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. Readings may not be comparable when testing curved or irregularly shaped test specimens. D145 Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. Are you an Engineering professional? I agree with much of tom’s comments but I am asm that the difference between the two instruments is 10 numerical units or even greater.
The D results from both labs matched however the D test results varied. Material 1 and Material 2 should be the same. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental d141 and determine the applicability of regulatory limitations prior to use.
It’s easy to join and it’s free. D Type M micro-hardness testing Thanks Tom for the insight! Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. It is easy to find on the web. Click Here to join Eng-Tips and talk with other members!
Students Click Here Join Us! First off, thank you for your input! Promoting, selling, recruiting, coursework and thesis posting is forbidden. D Type M micro-hardness testing ” Do not regsrd both as durometer. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. 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.
However, relaxation is not the only factors at play. I’m new to the rubber scene so any help is appreciated!
ASTM D – 18 Standard Test Method for Rubber Property—International Hardness
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 have had some O-rings tested at two different labs. Download Now White Paper: