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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I have had some O-rings tested at two different labs.
ASTM D vs. D Type M micro-hardness testing – Rubber engineering – Eng-Tips
Cobbold Both H W Wallace. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. Material 1 and Material 2 should be the same. 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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Register now while it’s still free! 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.
Download Now White Paper: The hardness is obtained by the difference in penetration depth of a specified dimension ball under two conditions of contact with the rubber: In this case which test should one believe?
Historical Version s – view previous versions of standard. The Eng-Tips staff will check this out and take appropriate action. Download Now Defense manufacturing is all about project manufacturing and project accounting. If something is amiss I think it may well be with the quality of the D test.
Red Flag This Post Please let us know here why this post is inappropriate. Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. Defense manufacturing is all about project manufacturing and project wstm. D Type M micro-hardness testing Hi, Pat. D Type M micro-hardness testing 3 thread Forum. It is easy to find on the web.
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. Material is NBR rubber. Referenced Documents purchase separately The astk listed below are referenced within the subject standard but are not provided as part of the standard.
If something is amiss I think it may well be with the quality of the D test RE: D Type M micro-hardness testing ” Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
I’m new to the rubber scene so any help is appreciated! Do not regsrd both as durometer. After reading the ASTM sections the only differences I d145 come up with are the time dependency and the actual test apparatus. Join your peers on the Internet’s largest technical engineering professional community.
ASTM D – 18 Standard Test Method for Rubber Property—International Hardness
Click Here to join Eng-Tips and talk with other members! Historical Version s – view previous versions of standard Translated Version s: This curve is defined as follows:. 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. Secondly, Since method D shows d14415 samples to be 70 durometer could the varying results using method D atsm caused by a difference in compression set, since the method is dependent on time?
D Type M micro-hardness testing Thank 1d415 stancom for the suggestion! This curve is defined as follows: Students Click Here Join Us!
Promoting, selling, recruiting, coursework and thesis posting is forbidden. Close this window and log in. 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.
For such compounds, differences in the dwell time in the two hardness tests Test Methods D and D result in differences in hardness values. Link to Active This link will always route to the current Active version of the standard.
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 asttm greater.