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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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? Click Here to join Eng-Tips and talk with other members!
In my experience, admittedly with the normal test, the difference ought not to axtm 5 units or so even when we recognise the underlying difference in durometer and International Rubber Hardness tests.
IRHD Micro Hardness Tester, ISO 48, ASTM D
Close this window and log in. It is easy to find on the web. I think it depends on what what specification or requirements you’re trying to meet, or what the customer wants.
If something is amiss I think it may well be with the quality of the D test. Thank you for any and all tips! Zstm Type M micro-hardness testing 3. Do not regsrd both as durometer. D Type M micro-hardness testing Thank you stancom for the suggestion!
D Type M micro-hardness testing Thanks Tom for the insight!
Download Now White Paper: Students Click Here Join Us! I think it’s like tear strength; there are several different test methods e.
Material 1 and Material 2 should be the same. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
Readings may not be comparable when testing curved or irregularly shaped test specimens. 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!
In this case which test should one believe? Download Now Defense manufacturing is all about project manufacturing and project accounting. Historical Version s – view previous versions of standard Translated Version s: For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values. D Type M micro-hardness testing 3 thread Forum.
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ASTM D – IRHD HARDNESS
I’m new to the rubber scene so e1415 help is appreciated! The differential penetration is taken at a specified time and converted to a hardness scale value. This curve is defined as follows: D Type M micro-hardness testing Hi, Pat.
I have had some O-rings tested at two different labs.
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. Could anyone better explain the differences between the two?
Are the results even comparable in the same scale? The tip of the indentor takes some time to settle into the depression it astj, eg overcoming drag forces – which one reason for the application of a solid lubricant, usually talc. Resources Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors.
Something I should have included before: Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. D Type M micro-hardness testing ” The Eng-Tips staff will check this out and take appropriate action.
Cobbold Both H W Wallace. Historical Version s – view previous versions of standard.