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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Could anyone better explain the differences between the two? Download Now Defense manufacturing is all about project manufacturing and project accounting. Obviously an extreme case will be the rapid fall when unvulcanised rubber is tested. I have had some O-rings tested at two different labs. If something is amiss I think it may well be with the quality of the D test. This curve is defined as follows: It’s easy to join and it’s free.

Thank you asm helping keep Eng-Tips Forums free from inappropriate posts. Historical Version s – view previous versions of standard Translated Version s: Readings may not be comparable when testing curved or irregularly shaped test specimens.

This curve is defined as follows:. 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 think it depends on what what specification or requirements you’re trying to meet, or what the customer wants. Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors.


D Type M micro-hardness testing 3. Close this window d145 log in. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. 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.

If something is amiss I think it may well be with the quality of the D test RE: I’m new to the rubber scene so any help is appreciated! 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. In this case which test should one believe? D Type M micro-hardness testing Thanks Tom for the insight! The Eng-Tips staff will check this out and take appropriate action.

ASTM D1415

For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values. Register now while it’s still free! Referenced Documents purchase separately Asfm documents listed below are referenced within the subject standard but are not provided as part of the standard.


Material 1 and Material 2 should be ast same. D Type M micro-hardness testing Hi, Pat. 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.

Thanks Again Pat RE: 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.

ASTM D – 06 Standard Test Method for Rubber Property—International Hardness

The D results from both labs matched however the D test results varied. Thank you for any and all tips! After reading the ASTM sections the only differences I can come up with are the time dependency and the actual test apparatus.