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Average weight of the 2 or 2.1mm sponges

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merlin el mago View Drop Down
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    Posted: 06/27/2020 at 9:21am
I want to know the average weight of the 2 or 2.1mm sponges without the rubber cut for the blades.

TIA.


Edited by merlin el mago - 06/27/2020 at 9:22am
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cole_ely View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cole_ely Quote  Post ReplyReply Direct Link To This Post Posted: 06/27/2020 at 10:35am
they're typically just under half of the rubber weight. Maybe 28g, depending on the type
W1 St with Illumina 1.9r, defender1.7b

Please let me know if I can be of assistance.
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cole_ely View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cole_ely Quote  Post ReplyReply Direct Link To This Post Posted: 06/27/2020 at 10:36am
Sorry cut. That's the full square  maybe 20 or 22g cut?
W1 St with Illumina 1.9r, defender1.7b

Please let me know if I can be of assistance.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote merlin el mago Quote  Post ReplyReply Direct Link To This Post Posted: 06/27/2020 at 10:58am
Thank you
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shinshiro View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shinshiro Quote  Post ReplyReply Direct Link To This Post Posted: 06/27/2020 at 4:45pm
Originally posted by cole_ely cole_ely wrote:

they're typically just under half of the rubber weight. Maybe 28g, depending on the type
I agree.
Once in the past I separated the sponge from topsheet of a small piece of a rubber (not sure exactly what rubber it was, maybe Mark V?...). I also don't remember the exact weight, but it was about the same as topsheet. 
I did that because I wanted to know how much weight I could save if I pick a thinner sponge. But I found that the difference is smaller than I initially thought.


Edited by shinshiro - 06/27/2020 at 4:46pm
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igorponger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 06/28/2020 at 5:37pm
LET'S DO SOME ARITHMETICS.

https://www.researchgate.net/publication/330152574_Table_Tennis_Ball_Impacting_Racket_Polymeric_Coatings_Experiments_and_Modeling_of_Key_Performance_Metrics

Typically, Porous Sponge density is measured to 0.4 - 0.6
Hence, you can say a factual weight of the sponge sheet by doing some arithmetics.

Example: sponge sheet 2 mm thick, being cut to the blade's size is known to square 200 cm2 net size. Sheet volumes 200 x 0.2 = 40 cm3
Dry Weight of the sponge sheet = 40 x 0.4-0.6 =16-24 grammes

NOTE: Separate rubber topsheet of the same size should be approximately 2 times as bigger weight, for the higher material density of 0.9 -1.1

/Be happy/

Edited by igorponger - 06/28/2020 at 5:44pm
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cole_ely View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cole_ely Quote  Post ReplyReply Direct Link To This Post Posted: 06/28/2020 at 9:11pm
in my empirical experience it's just not that big of a ratio at all. In Japanese rubber in fact, I would guess some tops might actually be lighter than the sponges.

When I had the palio c tops they were around 26 uncut....lighter than most sponges I put them on or maybe the same.
W1 St with Illumina 1.9r, defender1.7b

Please let me know if I can be of assistance.
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