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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Do not regsrd both as durometer. The hardness is obtained by the difference in penetration depth of a specified dimension ball under two conditions of contact with the rubber: I think it’s like tear strength; there are several different test methods e. After reading the ASTM sections the only differences I can come up with are the time dependency and the actual test apparatus.
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D Type M micro-hardness testing 3. Join your peers on the Internet’s largest technical engineering professional community. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. Readings may not be comparable when testing curved or irregularly shaped test specimens. 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 astn elastic modulus.
ASTM D – 18 Standard Test Method for Rubber Property—International Hardness
If something is amiss I think it may well be with the quality of the D test. This curve is defined as follows: D Type M micro-hardness testing ” This curve is defined as follows:. Morgans University of Greenwich. Red Flag This Post Please let us know here why this post is inappropriate. Thanks Again Pat RE: Obviously d11415 extreme case will be the rapid fall when unvulcanised rubber is tested.
First off, r1415 you for your input!
Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. I’m new to the rubber scene so any help is appreciated!
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. 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?
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Defense manufacturing is all about project manufacturing and project accounting. Material is NBR rubber. For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values.
Click Here to join Eng-Tips and talk with other members! It is the responsibility of the user wstm this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Historical Version s – view previous versions of standard. Resources Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors.
It’s easy to join and it’s free. Students Click Here Join Us! In this case which test should one believe?
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 Zstm Rubber Hardness tests. Register now while it’s still free! Material 1 and Material 2 should be the same. Are you an Engineering professional? Download Now White Paper: 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 wstm.
If something is amiss I think it may well be with the quality of the D test RE: Could anyone better explain the differences between the two?
ASTM D vs. D Type M micro-hardness testing – Rubber engineering – Eng-Tips
However, relaxation is not the only factors at play. Thank you for any and all tips! Download Now Defense manufacturing is all about project manufacturing and project accounting.
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 Thanks Tom for the insight!
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided d14115 part of the standard. D Type M micro-hardness testing Hi, Ast.