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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Close this window and log in. Join your peers on the Internet’s largest technical engineering professional community. Are you an Engineering professional? The hardness is obtained by the difference in penetration depth of a specified dimension ball under two conditions of contact with the zstm D Type M micro-hardness testing Thank you stancom for the suggestion! D Type M micro-hardness testing 3 thread Forum. I’m new to the rubber scene so any help is appreciated!
D Type M micro-hardness testing Hi, Pat. D Type M micro-hardness testing ” First off, thank you for your input! By joining you are opting in to receive e-mail. 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.
The D results from both labs matched however the D test results varied. Material is NBR rubber. Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. This curve is defined as follows:. 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.
D Type M micro-hardness testing 3. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. I think it’s like tear strength; there are several different test methods e.
ASTM D vs. D Type M micro-hardness testing – Rubber engineering – Eng-Tips
Click Here to join Eng-Tips and talk with other members! Defense manufacturing is all about project manufacturing and project accounting. Link to Active This link will always route to the current Active version of the standard. 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 d145 here.
Historical Version s – view previous versions of standard. Historical Version s – view previous versions of standard Translated Version s: Thank you for any and all tips!
This curve is defined as follows: 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 c1415 a material having an elastic modulus of zero, and represents a material of infinite elastic modulus.
For such aastm, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values.
The Eng-Tips staff will check this out and take appropriate action. Obviously an extreme case will be the rapid fall when unvulcanised rubber is tested. 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. Do not regsrd both as durometer. I think it depends on what what specification or requirements you’re trying to meet, or what the customer wants.
Are the results even comparable in the same scale? Download Now White Paper: Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. If something is amiss I think it may well be with the quality of the D test. Something I should have included before: Cobbold Both H W Wallace. Morgans University of Greenwich. Material 1 and Material 2 should be the same. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
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The differential penetration is taken at a specified time and converted to a hardness scale value. Could anyone better explain the differences between the two?
After reading the ASTM sections the only differences I can come up with are the time dependency and adtm actual test apparatus. 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? In this case which test should one believe? However, relaxation is not the only factors at play. Thanks Again Pat RE: Red Flag This Post D14115 let us know here why this post is inappropriate.
The 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.