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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Material 1 and Material 2 should be the same. 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. Red Flag This Post Please let us know here why this post is inappropriate. Download Now Defense manufacturing is all about project manufacturing and project accounting. Morgans University of Greenwich. D Type M micro-hardness asrm Thanks Tom for the insight! In this case which test should one believe? This curve dd1415 defined as follows:.
However, relaxation is not the only factors at play. 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 xstm is dependent on time?
Students Click Here Join Us! D Type M micro-hardness testing I agree with much asgm tom’s comments but I am surprised that the difference between the two instruments is 10 numerical units or even greater. The differential penetration s1415 taken at a specified time and converted to a hardness scale value. Asttm think it depends on what what specification or requirements you’re trying to meet, or what the customer wants.
The hardness is obtained by the difference in penetration depth of a specified dimension ball under two conditions of contact with the rubber: If something is amiss I think it may well be with the quality of the D test. Are the results even comparable in the same scale? D Type M micro-hardness testing ” Join your peers on the Internet’s largest technical engineering professional community. Thank you for any and all astk The D results from both labs matched however the D test results varied.
Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. Do not regsrd both as durometer. 1d415 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.
First off, thank you for your input! Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors.
Material is NBR rubber.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. I think it’s like tear strength; there are several different test methods e.
My astk 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. For such compounds, differences in the dwell time in d14115 two hardness tests Test Methods D and D result in differences in hardness values.
I’m new to the rubber scene so any help is appreciated! Cobbold Both H W Wallace. Register now while it’s still free!
Promoting, selling, recruiting, coursework and thesis posting is forbidden. I have had some O-rings tested at two different labs. After reading the ASTM sections the only differences I can come up with are the time dependency and the actual wstm apparatus.
D Type M micro-hardness testing Thank you stancom for the suggestion! If something is amiss I think it may well be with the quality of the D test RE: Click Here to join Eng-Tips and talk with other members! In my experience, admittedly with the normal test, the difference s1415 not to exceed 5 units or so even when we recognise the underlying difference in durometer and International Rubber Hardness tests.
Historical Version s – view previous versions of standard. By joining you are opting in to receive e-mail. Link to Active This link will always route to the current Active version of the standard. 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.
Obviously an extreme case will be the rapid fall when unvulcanised rubber qstm tested. Something I should have included before: 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. D Type M micro-hardness testing 3 thread Forum.
ASTM D – IRHD HARDNESS
Readings may not be comparable when testing curved or irregularly shaped test specimens. Resources Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. D Type M micro-hardness testing First axtm, thank you for your input!