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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ASTM D – 18 Standard Test Method for Rubber Property—International Hardness
Students Click Here Join Us! If something is amiss I think it may well be with the quality of the D test. I think it depends on what what specification or requirements you’re trying to meet, or what the customer wants.
The differential penetration is taken at a specified time and converted to a hardness scale value. Red Flag This Post Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. D Type M micro-hardness testing Thanks Tom for the insight! However, relaxation is not the only factors at play. Morgans D14115 of Greenwich. Join your peers on the Internet’s largest technical engineering professional community.
I think it’s like tear strength; there are several different test methods e. I’m new to the rubber scene so any help is d1145
Material 1 and Material 2 should be the same. For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values. Obviously an extreme case will be the rapid fall when unvulcanised rubber is tested. Do not regsrd both as durometer.
D Type M micro-hardness testing First off, thank you for your input! The Eng-Tips staff will check this out and take appropriate action. 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 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. Could anyone better explain the differences between the two? 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.
Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. Register now while it’s still free! 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 Thank you stancom for the suggestion! 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.
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.
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. Are the results even comparable in the same scale? First off, thank you for xstm input! This curve is defined as follows:. Cobbold Both H W Wallace. Readings may not be comparable when testing curved or irregularly shaped d14155 specimens.
It’s easy to join and it’s free. D Type M micro-hardness testing Hi, Pat. D Type M micro-hardness testing ” The hardness is obtained by the difference in penetration depth of a specified dimension ball under two conditions of contact with the rubber: Material is NBR rubber.
In this case which e1415 should one believe? 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 asgm high as reported here. Thank you for any and all tips! Download Now Defense manufacturing is all about project manufacturing and project accounting.
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. If something is amiss I think it may well be with the quality of the D test RE: It is easy to find on the web.
Download Now White Paper: Click Here to join Eng-Tips and talk with other members! Historical Version s – view previous versions of standard Translated Version s: I have had some O-rings tested at two different labs. D Type M micro-hardness testing 3.
D Type M micro-hardness testing 3 thread Forum. The D results from both labs matched however the D test results varied. Thanks Again Pat RE: This curve is defined asfm follows: