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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However, relaxation is not the only factors at play. I have had some O-rings tested at two different labs. I think it’s like tear strength; there are several different test methods e. Cobbold Both H W Wallace.
ASTM D – IRHD HARDNESS
I think it depends on what what specification or requirements you’re trying to meet, or what the customer wants. Referenced Documents purchase separately The documents asfm below are referenced within the subject standard but are not provided as part of the standard. Join your peers on the Internet’s largest technical engineering professional community. Students Click Here Join Us! Thank you for any and all tips!
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D Type M micro-hardness testing Hi, Pat. Morgans University of Greenwich.
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? D Type M micro-hardness testing Thanks Tom for the insight! In this case which test should one believe? By joining you are opting in to receive e-mail. Resources Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors.
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. Download Now Defense manufacturing is all about project manufacturing and project accounting. Download Now White Paper: Historical Version s – view previous versions of standard Translated Version s: 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.
First off, thank you asttm your input! After reading the ASTM sections the only differences I can come up with are the time dependency and the actual test apparatus. Defense manufacturing is all about project manufacturing and project accounting.
Material 1 and Material 2 should be the same. D Type M micro-hardness testing 3 thread Forum. Readings may not be comparable when testing curved or irregularly shaped test specimens.
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The D results from both labs matched however the D test results varied. Could anyone better explain the differences between the two?
Close this window and log in. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. Link to Active This link will always route to the current Active version of the standard. D Type M micro-hardness testing Thank you stancom for the suggestion! Material is NBR rubber.
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. Promoting, selling, recruiting, coursework and thesis posting is forbidden. The Eng-Tips staff will check this out and take appropriate action.
Thanks Again Pat RE: