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. Find the most up-to-date version of ASTM D at Engineering IRHD Hardness – ASTM D IRHD: International Rubber Hardness Degrees. A measure of the indentation resistance of elastomeric or rubber materials.

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Historical Version s – view previous versions of standard. I think it depends on what what specification or requirements you’re trying to meet, or what the customer wants.

First off, thank you for your input! In this case which test should one believe? Readings may not be comparable when testing curved or irregularly shaped test specimens.

D Type M micro-hardness testing First off, thank you for your input! Thank you for helping keep Eng-Tips Forums free from inappropriate posts. It’s easy to join and it’s free.

ASTM D vs. D Type M micro-hardness testing – Rubber engineering – Eng-Tips

Resources Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor. Close this window dd1415 log in.

By joining you are opting in to receive e-mail. The D results from both labs matched however the D test results varied.


However, relaxation is not the only factors at play. I’m new to the rubber scene so any help is appreciated!

Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor. Cobbold Both H W Wallace. Could anyone better explain the differences between the two?

Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: The tip of the indentor takes some time to settle into the d11415 it makes, eg overcoming drag forces – which one reason for the application of a solid lubricant, usually talc.

The hardness is obtained by the difference in penetration depth of a specified dimension ball under two conditions of contact with the rubber: Thanks Again Pat RE: Link to Active This link will always route to the current Active version of the standard.

Morgans University of Greenwich. Material 1 and Material 2 should be the 1d415. I have had some O-rings tested at two different labs.

Obviously an extreme case will be the rapid fall when unvulcanised rubber is tested. Register now while it’s still free!

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.


Click Here to join Eng-Tips and talk with other members! This curve is defined as follows:. Join your peers on the Internet’s largest technical engineering professional community. It is easy to find on the web. 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.

I think it’s like tear strength; there are several different test methods e. 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. The differential penetration is taken at a specified time and converted to a hardness scale value. D Type M micro-hardness testing Hi, Pat.

IRHD Hardness – ASTM D1415

The Eng-Tips staff will check this out and take appropriate action. Students Click Here Join Us! Are the results even comparable in the same scale? D Type M micro-hardness testing Thank you stancom for the suggestion!