Talk:Shore durometer

With regards to the comment below, what the heck is up with the use of the degree symbol in a single section of this article?

<10 °Sh or >90 °Sh

It isn't referenced or used anywhere else. I can't find mention of using a degree symbol with shore anywhere else on the web. I have seen this used in industry, but I have no basis for why that is or any scholarly articles pointing to that being a standard.

Any thoughts?

-Nick

-- — Preceding unsigned comment added by 12.236.138.174 (talk) 15:20, 1 April 2022 (UTC)

Hi,

I'm not sure about this line.

The term is also used to describe a material's rating on the scale, as in an object having a “‘Shore durometer’ of 90.”

When I studied polymer science and technology in 1987, the durometer was the machine which Mr Shore used to devise his set of scales. Certainly in UK and European usage you would say something like

The material had a“‘Shore hardness’ of 90 A.”

Otherwise its like saying the temperature is 21. In Centigrade/Celsius that's almost comfortable. In Fahrenheit it's very cold. In Kelvin, we've almost frozen the Hydrogen.

Cheers

simon ˜˜˜˜

Hi,

Can anybody confirm if this scale is a stiffness scale or a hardness scale? A Google search found the book referenced below and the quote below that:

An Introduction To Rubber Technology by Andrew Ciesielski, Rapra Technology Limited - 1999 - Technology & Engineering - 174 pages

At values above 90 Shore A, the stiffness that hardness approximately correlates with, begins to increase exponentially, and it is recommended that a Shore ...

The scale was described as the "Shore Stiffness scale" everywhere I came accross it (not many places mind you!).

Regards,

Keith. 122.111.158.58 (talk) 20:15, 24 February 2009 (UTC)

Shore durometer
Hello, and welcome to Wikipedia! We appreciate your contributions to the Shore durometer article, but we cannot accept copyrighted text or images borrowed from other web sites or printed material. Perhaps you would like to rewrite the article in your own words. For more information, take a look at Wikipedia's policies and guidelines. Happy editing! Chrike 04:44, 17 April 2006 (UTC)

Copyrighted material is GONE
I've completely rewritten the article, and it is now free from copyright issues. Enjoy! Phidauex 01:14, 29 April 2006 (UTC)

List Scales in Order
In the "Durometer Scales" section, the various Shore scales should be listed in order of increasing or decreasing hardness. Fozzybird 21:29, 1 March 2007 (UTC)

Convention for "log" ???
Could the author of this article please clarify in the formula(s) whether "log" denotes log-base-10 or log-base-e? Unfortunately there is not a clear convention on this (see Wikipedia discussion on logarithms). Otherwise great article! —Preceding unsigned comment added by 68.65.89.154 (talk) 19:09, 18 March 2011 (UTC)

If the log in base 10 is used in the last expression to calculate the young's modulus, the result will not agree with the one that is calculated with the first expression. However, the results nearly coincide provided that the log base used is e. 128.178.46.164 (talk) 15:32, 5 July 2011 (UTC)

I beg to differ; I could not obtain any agreement using log base e. Using log base 10, I found that the slope agreed well (although the values are slightly higher than for the other methods). I then reread the Qi et. al. paper, and found that (a) they do indeed specify log base 10, and (b) they note that their curve (based on non-linear FEA results) does give higher values than the Gent and other analytical methods. The formula has been distributed around the internet using log base e (possibly because of this error?): of course, it's not something that many people (even in the elastomer industry) can check. — Preceding unsigned comment added by 217.33.180.66 (talk) 09:58, 9 May 2012 (UTC)

I agree with the above statement. I am measuring a styrenic alloy with a Shore D digital durometer (with a verified calibration against ASTM D 2240 calibrated test blocks) Durometer readings are in the ballpark of 70 (about as hard as a shoe heel). Using the e base, the modulus of elasticity calculates to 0.008 GPa [1.16ksi]. This clearly does not make sense; A Young's modulus of 0.01 indicates a very flexible, 'gooey' rubber or foam rubber. Using base 10, the outcome is ~130 MPa, which is a much more reasonable number. The upper calculation yields a number that is about twice this...It really seems like more work needs to be done to identify the correct source for this information.Dragontsd (talk) 00:38, 10 January 2015 (UTC)dragontsd — Preceding unsigned comment added by Dragontsd (talk • contribs) 23:39, 9 January 2015 (UTC)

12 types?
The article mentions there being twelve types of durometer scale, including an R scale, but this type is not present in the list below. Please include it or indicate why it is excluded. Thanks. 69.199.250.34 (talk) 21:45, 17 August 2011 (UTC)

There is also Shore B and Shore C used for foam materials. — Preceding unsigned comment added by 68.7.149.202 (talk) 07:35, 3 February 2012 (UTC)

MPA or GPa?
Can anybody confirm that the units in the E-modulus calculation in in MPa? For mee it looks more like GPa. — Preceding unsigned comment added by 80.101.13.228 (talk) 13:40, 6 September 2012 (UTC)

Terminology
HSD = ? HSA = ? — Preceding unsigned comment added by 50.200.196.10 (talk) 16:08, 29 April 2013 (UTC)

Durometer number?
The article says that an indentation of 0.100" is 0 and of 0.0" is 100. Is the scale linearly interpolated between there? That is, is is the durometer number 100 minus indentation / 0.001"? —Ben FrantzDale (talk) 15:23, 21 March 2017 (UTC)

Permanent?
I'm pretty sure the Shore durometer is a measure of both permanent (plastic) and elastic (non-permanent) deformation. I'm removing the word permanent from the second sentence. For example, when i do a Shore A hardness test on a soft rubber, there is no permanent deformation visible - and certainly not as deep as the penetrator went. A material undergoing all plastic vs. all elastic deformation might have the same value on this test. — Preceding unsigned comment added by 207.141.70.130 (talk) 23:39, 25 May 2017 (UTC)