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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D Type M micro-hardness testing ” If something is amiss I think it may well be with the quality of the D test. D Type M micro-hardness testing 3 thread Forum.
Close this window and log in. 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: Morgans University of Greenwich.
My understanding is d145 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.
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.
Are the results even comparable in the same scale? Thanks Again Pat RE: The Eng-Tips staff will check this out and take appropriate action. 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.
Historical Version s – view previous versions of standard. Historical Version s – view previous versions of standard Translated Version s: The differential penetration is taken at a specified time and converted to a hardness scale value. Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. Join your peers on the Internet’s largest technical engineering professional community.
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 d1145 International Rubber Hardness tests.
It is easy to find on the web. The D results from both labs matched however the D test results varied.
First off, thank you for your input! I have had some O-rings tested at two different labs. Download Now Defense manufacturing is all about project manufacturing and project accounting. Reasons such as off-topic, duplicates, flames, illegal, e1415, or students posting their homework. Material is NBR rubber.
ASTM D – 18 Standard Test Method for Rubber Property—International Hardness
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. D Type M micro-hardness testing 3. Students Click Here Join Us! 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.
IRHD Micro Hardness Tester, ISO 48, ASTM D
After reading the ASTM sections aetm only differences I can come up with are the time dependency and the actual test apparatus. Register now while it’s still free! Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The measured penetration is converted into IRHD, the scale of degrees being so chosen that 0 represents a atm having an elastic modulus of zero, and represents a material of infinite elastic modulus.
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.
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Download Now White Paper: Are you an Engineering professional? Secondly, Since method D shows both samples aetm 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?
For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values. Posting Guidelines Promoting, selling, recruiting, coursework and thesis asfm is forbidden. Thank you for any and all tips! D Type M micro-hardness testing Thank you stancom for the suggestion!