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igorponger
PostPosted: 10 Sep 2021, 13:15 
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A view behind the scene. Quality control at German ESN factory.


Image
RASANT Hardness Chart by SHORE-O scale

Shore"A" . . . Shore"O". . .ASKER"C"
40 . . . . . . . . . .50 . . . . . . .70
37.5 . . . . . . . . 47.5 . . . . . .68
35 . . . . . . . . . . 45 . . . . . . .65
30 . . . . . . . . . . 40 . . . . . . .60
28 . . . . . . . . . . 37.5 . . . . . .58

ASKER C, indenter hemisphere d=5.08 mm
Shore O, indenter hemisphere d= 2.34 mm
Shore A, indenter truncated conical

Prior to the year 1990, Tamasu Batterfly® is known to use ASKER-C scale as a hardness criterium of their rubber products.. They did switched to SHORE-A scale since then.
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igorponger
PostPosted: 04 Oct 2021, 23:18 
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HOW DO I KNOW SPEED POTENCIA OF A TABLE TENNIS RUBBER

http://www.guoqiuhui.net/Home/Goods/det ... ds_id/2568
Hardness by Shore durometer is a statical charateristic of the sponge, it has no direct relation with the amount of speed you get on the sponge. For making realistic evaluations of speed potencia of sponge material you need a resiliometer of Shob type.

Be happy
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katie77
PostPosted: 22 Dec 2022, 14:52 
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What metrics do you use for this? Are you using the durometer after cutting a corner of the rubber and removing it from the sponge? I don't think your outcomes are in doubt. I'm just curious about your approach. My rubbers date back five years. They're not going to be here for long. 
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merlin el mago
PostPosted: 22 Dec 2022, 19:49 
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Blade: D. M. S. The Wall Def-
FH: S&T Secret Flow Chop
BH: Spectre OX
@haggisv

I guess your table sponge hardness is measured Shore A scale, right?

Do you know the hardness of old TSP Curl P1-R?

TIA
Felipe

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HJ1S
PostPosted: 15 Mar 2023, 17:21 
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Blade: I'm going to build one!
Hi all,

Just looking into doing to research as to the rubbers. What makes rubbers harder than the other? Is it in the raw materials or production processes etc?

Would appreciate any help

See my latest topic on paddle construction
viewtopic.php?f=9&t=39847
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ChasFox
PostPosted: 16 Mar 2023, 00:22 
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Blade: S&T Black & White
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Rubber hardness is a combination of Sponge density and top sheet design and material. here is a good article

http://www.tabletennisnerd.com/articles ... 0A%20scale.
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HJ1S
PostPosted: 16 Mar 2023, 01:53 
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Blade: I'm going to build one!
ChasFox wrote:
Rubber hardness is a combination of Sponge density and top sheet design and material. here is a good article

http://www.tabletennisnerd.com/articles ... 0A%20scale.


Thanks ChasFox. Awesome help.
;)

Does anyone know how the sponge is produced?
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HJ1S
PostPosted: 16 Mar 2023, 01:59 
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Blade: I'm going to build one!
and rubbers come to think of it
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