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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IRHD Micro Hardness Tester, ISO 48, ASTM D
Obviously an extreme case will be the rapid fall when unvulcanised rubber is tested. It’s easy to join and it’s free. If something is amiss I think it may well be with the quality of the D asstm. Thanks Again Pat RE: D Type M micro-hardness testing Hi, Pat. Readings may not be comparable when testing curved or irregularly shaped test specimens.
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? I agree with much of tom’s comments aatm I am surprised that the difference between the two instruments is 10 numerical units or even greater. 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 astmm even greater.
My atsm 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.
Link to Active This link will always route to the current Active version of the standard. Do not regsrd both as durometer. D Type M micro-hardness testing Thanks Tom for the insight! D Type M micro-hardness testing 3 thread Forum.
For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values.
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.
ASTM D vs. D Type M micro-hardness testing – Rubber engineering – Eng-Tips
Historical Version s – view previous versions of standard. Students Click Here Join Us! Could anyone better explain the differences between the two? I think it depends on what what specification or requirements you’re trying to meet, or what the customer wants. Are you an Engineering professional?
Promoting, selling, recruiting, coursework and thesis posting is forbidden. Historical Version s – view previous versions of standard Translated Version s: Material 1 and Material 2 should be the same. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. First off, thank you for your input!
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If something is amiss I think it may well be with the quality of the D test RE: The Eng-Tips staff will check this out and take appropriate action. Material is NBR rubber. Cobbold Both H W Wallace.
Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. I think it’s like tear strength; there are several different test methods e. 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.
By joining you are opting in to receive e-mail. Close atsm window and log in. Download Now Defense manufacturing is all about project manufacturing and project accounting.
Morgans University of Greenwich. D Type M micro-hardness testing 3.