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Old July 14th, 2009, 08:38 PM   #1
Elysarian
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Lightbulb Durometer

Searched the forums and couldn't find anythnig like this, it's a chart comparing both the A and D durometer (Shore Hardness) scales with the Rockwell R scale.

Really puts into perspective how hard the old phenolic wheels were too

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Old July 15th, 2009, 12:29 AM   #2
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and explains why rubber bands fell out of favor with the jet set.
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Old July 15th, 2009, 03:45 AM   #3
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Hi Elysarian from England,

Someplace on this list (forum) we have discussed this before in some length. Search for Shore A or Shore D to find older conversations. Two list members spent some time playing/learning this stuff. You should enjoy these older discussions.

Since each material is a bit different in structure the probes used do not always yield consistent transformations across all materials. Now with phenolic (being so hard) it probably didn't matter yet it might matter with the polyurethanes. Hey I still have my phenolic wheels.

That is why in specification of elastomers one would specify which test was used and usually list a test specification from ASTM.

Yours in Skating, Engineering, MA/NY Skating Dave
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Old July 15th, 2009, 08:42 AM   #4
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Thanks for the extra info Dave

I'd always known that the D scale was "harder" than the A and had previously wondered where Phenolics came on the scale.
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Old July 27th, 2009, 12:25 AM   #5
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Quote:
Originally Posted by Elysarian View Post
Thanks for the extra info Dave

I'd always known that the D scale was "harder" than the A and had previously wondered where Phenolics came on the scale.
The two scales do not directly correspond, despite what the chart above might lead you to believe. The measurement method differs. In particular, the indenter shape on the instrument isn't the same, therefore materials do not react the same.

Here's some light reading on the matter. The Google search above will also yield some results of previous discussions.
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Old July 28th, 2009, 09:13 AM   #6
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Quote:
Originally Posted by dvw View Post
The two scales do not directly correspond, despite what the chart above might lead you to believe. The measurement method differs. In particular, the indenter shape on the instrument isn't the same, therefore materials do not react the same.

Here's some light reading on the matter. The Google search above will also yield some results of previous discussions.
Ty for the additional (see... you can teach an old dog!).
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