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Reporting the mass of your uncut rubbers

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hleett View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hleett Quote  Post ReplyReply Direct Link To This Post Posted: 12/31/2018 at 7:19pm
Here is my attempt to figure out the area of the most common blade size of 15.7x15.0cm. These blades include BTY TBS, Amultart, Schlager Carbon, Timo Boll, ZJK, MJ ALC/ZLC/ZLF/T5000/W7, Viscaria etc....and quite a few other popular brands as well.
Since 15.7x15.0 is not a perfect circle I am taking the average of these 2 numbers of 15.35cm diameter, 1/2 that for radius of 7.675cm. Since 
Area= π r
we have Area = (3.14159) x (7.675 x 7.675) 
Area is 185 square cm. Now multiply this number by your rubber's Gram/Sq cm and figure it's weight.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 01/01/2019 at 6:34pm
A PIECE OF WISDOM.
How do I know effective Playing Area of my racket blade wirh a high accuracy up to 0.1 square cm.

My best preffered method to find the playing area is as follows.   Materials needed
   -- A pair of scissors
   -- Sheet of a smooth cardboar A4 size   (my usual choice those pictorial cellulose dustcover to wrap Vynil diskus)
   -- Digital scales reading to 0.01 gramme

1. Cary over the blade's outer shape onto the cardboard sheet and cut the figure out. Weigh up the Figure (FW).

2. Cut off a square sample 10 x 10cm from the figure and weigh up the Sample (SW)

3. The Playing Area (Figure Area) = WF *100 / SW   cm2

Be Happy.

   PS// Through applying this procedure on many different rackets, I did found out that effective playing surface on most regular blades proved to be in the range of 200 -- 203 cm2.

Edited by igorponger - 01/02/2019 at 8:31am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fatt Quote  Post ReplyReply Direct Link To This Post Posted: 01/02/2019 at 1:26am
I found 195 in an old thread. also the 72/28 average seems good for the typical 169mmx169mm rubber and a 157x150 blade: a rubber that's 71 gr uncut will be about 0.72x71g= about 51g.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 01/03/2019 at 3:16am
Digital Scales is the very praised havings, indeed



A time ago, I had got to calculate effective playing area on those fancy shapes, in exact numbers to 0.1 decimal.




Thankfully, I was able to make the very best use of my digital balance, to my very best satisfaction. Educated mind is a great attainment, indeed.   

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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 01/03/2019 at 4:18am
Originally posted by Simas Simas wrote:

found a picture of my Palio AK47 Blue. Mine is very light.
Thickness: MAX
Colour: Black
Uncut Mass: 53g
Length: 166mm
Width: 166mm


    Hi, Simas
Just to proven the power of arithmetics.   I can instantly tell you the very exact cut weight on this rubber without making any physical reduction of the rubber sheet. It is kinda like a magical prophecy, indeed.
Let's go .....

53 / 16.6 x 16.6 = 0.192 g/cm2   Specific Weight of the Rubber
0.192 x 200 = 38 grammes           Cut weight estimated

So, you can now safely expect your present rubber sheet of AK47 to go reduced to 38 grammes after trimming.
Please let me know if my prediction meets the factual weight after trimming on the rubber.

Edited by igorponger - 01/03/2019 at 4:49am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Simas Quote  Post ReplyReply Direct Link To This Post Posted: 01/05/2019 at 7:02am
Originally posted by igorponger igorponger wrote:

Originally posted by Simas Simas wrote:

found a picture of my Palio AK47 Blue. Mine is very light.
Thickness: MAX
Colour: Black
Uncut Mass: 53g
Length: 166mm
Width: 166mm


    Hi, Simas
Just to proven the power of arithmetics.   I can instantly tell you the very exact cut weight on this rubber without making any physical reduction of the rubber sheet. It is kinda like a magical prophecy, indeed.
Let's go .....

53 / 16.6 x 16.6 = 0.192 g/cm2   Specific Weight of the Rubber
0.192 x 200 = 38 grammes           Cut weight estimated

So, you can now safely expect your present rubber sheet of AK47 to go reduced to 38 grammes after trimming.
Please let me know if my prediction meets the factual weight after trimming on the rubber.

Nice. But can't do that. The rubber is glued for some time now on my spare setup. When I peel it, if I won't forget, I will :)


Edited by Simas - 01/05/2019 at 7:03am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote piligrim Quote  Post ReplyReply Direct Link To This Post Posted: 01/05/2019 at 7:22am
Originally posted by igorponger igorponger wrote:


Let's go .....

53 / 16.6 x 16.6 = 0.192 g/cm2   Specific Weight of the Rubber
0.192 x 200 = 38 grammes           Cut weight estimated

So, you can now safely expect your present rubber sheet of AK47 to go reduced to 38 grammes after trimming.
Please let me know if my prediction meets the factual weight after trimming on the rubber.




I have this rubber. it weight 42g cut for regular size blade
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 01/05/2019 at 2:21pm
Still waiting for Simas response ....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 01/05/2019 at 3:03pm
Originally posted by piligrim piligrim wrote:


I have this rubber. it weight 42g cut for regular size blade

There is nothing wrong about the rubber.
    AK47 RED , high density sponge, 56 gramme uncut sheet (as owned by Piligrim )
    AK47 BLUE, low density sponge, 53 gramme uncut (as owned by Simas).

47 BLUE ultra light sponge, it feels much like squirell feather, indeed.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote haggisv Quote  Post ReplyReply Direct Link To This Post Posted: 01/06/2019 at 6:53pm
If all blades were the same shape and size, we could easily use the same formula... but unfortunately blade shapes and sizes vary significantly.

Smart; VS>401, Dtecs OX
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hleett Quote  Post ReplyReply Direct Link To This Post Posted: 01/06/2019 at 8:37pm
The formula is the same, just have to figure out the blade area plug in the G/(cm)(cm) values of your rubber. You don't have to be a rocket scientist to figure that out.Sleepy
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AndySmith Quote  Post ReplyReply Direct Link To This Post Posted: 01/19/2019 at 9:17am
Brand: Xiom
Rubber ID/Model: Omega 7 Pro
Thickness: Max
Colour: Red
Uncut Mass: 68.15g
Length: 169
Width: 169

Brand: Xiom
Rubber ID/Model: Omega 7 Pro
Thickness: Max
Colour: Black
Uncut Mass: 66.82g
Length: 169
Width: 169

Brand: 729
Rubber ID/Model: Bloom Arc H45
Thickness: 2.2
Colour: Black
Uncut Mass: 61.31g
Length: 163
Width: 163

Brand: 729
Rubber ID/Model: Bloom Spin H45
Thickness: 2.2
Colour: Black
Uncut Mass: 66.76g
Length: 163
Width: 163
This was a great signature until I realised it was overrated.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pitigoi Quote  Post ReplyReply Direct Link To This Post Posted: 01/28/2019 at 6:49pm
Brand: Yinhe
Rubber ID/Model: Mercury II medium-sponge
Thickness: max
Colour: red
Uncut Mass: 63g
Length: 169
Width: 165

density guess: 0.226

Brand: Adidas
Rubber ID/Model: Blaze Spin
Thickness: Max
Colour: black
Uncut Mass: 51g
Length: 169
Width: 169

density guess: .179
(not legal in tournaments anymore)

Brand: Xiom
Rubber ID/Model: Vega Europe
Thickness: Max
Colour: red
Uncut Mass: 60g
Length: 168
Width: 169

density guess: 0.211
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Post Options Post Options   Thanks (0) Thanks(0)   Quote obesechopper Quote  Post ReplyReply Direct Link To This Post Posted: 01/31/2019 at 5:32pm
stiga horizontal 20 long pips
1.4-1.7 sponge in red
30 grams uncut 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sedis Quote  Post ReplyReply Direct Link To This Post Posted: 02/02/2019 at 5:02am
Brand: Stiga
Rubber ID/Model: Airoc Astro S
Thickness: 2.1
Colour: Red
Uncut Mass: 64g
Length: 168
Width: 168
Measured sponge hardness: 42° Shore O


Edited by Sedis - 02/02/2019 at 5:05am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dream1700 Quote  Post ReplyReply Direct Link To This Post Posted: 02/04/2019 at 1:47pm
Brand: Butterfly
Rubber ID/Model: Rozena
Thickness: 1.9
Color: Black
Uncut Mass: 66.5
Length: 180
Width: 167
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Post Options Post Options   Thanks (0) Thanks(0)   Quote igorponger Quote  Post ReplyReply Direct Link To This Post Posted: 02/05/2019 at 4:17pm
Originally posted by Sedis Sedis wrote:

<span style=": rgb251, 251, 253;">Brand: Stiga</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Rubber ID/Model: Airoc Astro S</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Thickness: 2.1</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Colour: Red</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Uncut Mass: 64g</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Length: 168</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Width: 168</span>
<span style=": rgb251, 251, 253;">Measured sponge hardness: 42</span><span style="color: rgb84, 84, 84; font-family: arial, sans-serif; font-size: small;">°</span><span style="color: rgb84, 84, 84; font-family: arial, sans-serif; font-size: small;"> </span><span style=": rgb251, 251, 253;">Shore O</span>



Originally posted by Sedis Sedis wrote:

<span style=": rgb251, 251, 253;">Brand: Stiga</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Rubber ID/Model: Airoc Astro S</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Thickness: 2.1</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Colour: Red</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Uncut Mass: 64g</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Length: 168</span><br style=": rgb251, 251, 253;"><span style=": rgb251, 251, 253;">Width: 168</span>
<span style=": rgb251, 251, 253;">Measured sponge hardness: 42</span><span style="color: rgb84, 84, 84; font-family: arial, sans-serif; font-size: small;">°</span><span style="color: rgb84, 84, 84; font-family: arial, sans-serif; font-size: small;"> </span><span style=": rgb251, 251, 253;">Shore O</span>



Hi, Sedis

It's great to obtain the Sponge Hardness actual numbers from tester's hand directly.. . So kind of you, indeed.   
Yes, we need all the tribology data of each rubber present on LARC list.
Your given measurements of sponge hardness is of real value.   Yes, we'll gladly incorporate your every information into our Big Rubber Hardness Chart and the Big Sheet Of Rubber Mass as well.

THANKS YOU again, a lot.

https://tabletennis-reviews.com/reference/sponge-hardness-table/

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Post Options Post Options   Thanks (0) Thanks(0)   Quote AndySmith Quote  Post ReplyReply Direct Link To This Post Posted: 02/08/2019 at 5:19am
Brand: Joola
Rubber ID/Model: Golden Tango PS
Thickness: Max
Colour: Black
Uncut Mass: 73.20g
Length: 169
Width: 169

Brand: Andro
Rubber ID/Model: Rasanter V47
Thickness: 2.0mm
Colour: Red
Uncut Mass: 67.74g
Length: 169
Width: 169
This was a great signature until I realised it was overrated.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sedis Quote  Post ReplyReply Direct Link To This Post Posted: 02/08/2019 at 5:40am
Originally posted by igorponger igorponger wrote:

 

Hi, Sedis

It's great to obtain the Sponge Hardness actual numbers from tester's hand directly.. . So kind of you, indeed.   
Yes, we need all the tribology data of each rubber present on LARC list.
Your given measurements of sponge hardness is of real value.   Yes, we'll gladly incorporate your every information into our Big Rubber Hardness Chart and the Big Sheet Of Rubber Mass as well.

THANKS YOU again, a lot.

https://tabletennis-reviews.com/reference/sponge-hardness-table/


No problem - I purchased a durometer after borrowing one and finding it really useful, I will include my results with any future weight submissions. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sedis Quote  Post ReplyReply Direct Link To This Post Posted: 02/18/2019 at 1:46pm
Brand: Tibhar
Rubber ID/Model: Hybrid K1 Pro 
Thickness: Max
Colour: Black
Uncut Mass: 71g
Length: 170
Width: 169
Measured sponge hardness: 54° Shore O
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vanjr Quote  Post ReplyReply Direct Link To This Post Posted: 02/25/2019 at 9:35am
Brand: Andro
Rubber ID/Model: rasanter R42
Thickness: max
Colour: Black
Uncut Mass: 67.1 g
Length: 171 (from handle to tip) mm
Width: 170 mm

Brand: Spinlord
Rubber ID/Model: Gigant
Thickness: 1.2
Colour: Red
Uncut Mass: 35.6 g
Length: 177 mm
Width: 176 mm

Brand: Dermaterialspezialist
Rubber ID/Model: Reflection
Thickness: 1.2
Colour: Red
Uncut Mass: 35.6 g
Length: 170 mm
Width: 171 mm
Gambler Hinoki Vector blade; Double inverted. Or some LPs.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dream1700 Quote  Post ReplyReply Direct Link To This Post Posted: 02/27/2019 at 3:34pm
Brand: Andro
Rubber ID/Model: Rasanter V47
Thickness: 1.7
Color: Red
Uncut Mass: 65.8
Length: 170
Width: 168
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hleett Quote  Post ReplyReply Direct Link To This Post Posted: 03/09/2019 at 6:59pm
Brand: Xiom
Rubber ID/Model: Omega VII Pro
Thickness: 2.0
Colour: Black
Uncut Mass: 63.5g
Length: 170mm
Width: 170mm
Density: 0.2197


Edited by hleett - 03/10/2019 at 12:27pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vanjr Quote  Post ReplyReply Direct Link To This Post Posted: 03/12/2019 at 8:58am
Brand: 729 (friendship
Rubber ID/Model: 729-08 ES
Thickness: 2.1
Color: black
Uncut Mass: 61.6 g
Length: 164
Width: 167
sponge 45 degree
Gambler Hinoki Vector blade; Double inverted. Or some LPs.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pitigoi Quote  Post ReplyReply Direct Link To This Post Posted: 04/05/2019 at 5:09pm
Brand: RITC/Friendship/729
Rubber ID/Model: Dr. Evil
Thickness: OX
Colour: red
Uncut Mass: 22g
Length: 168mm
Width: 174mm

density guess: 0.075




Brand: Palio
Rubber ID/Model: CK531A (blue package)
Thickness: 06-0.8 mm
Colour: black
Uncut Mass: 37g
Length: 165
Width: 163

density guess: 0.137





Brand: 729 RITC
Rubber ID/Model: Legend 105
Thickness: 1.9mm
Colour: red
Uncut Mass: 48g
Length: 163mm
Width: 163mm

density guess: 0.181
Right hand: Stiga Allround NCT (74g) /Rasant Grip max/Talon OX red (total 135g)
Left hand: Stiga Allround WRB (71g)/Vega Europe max/Innova Ultra Light max (total 153g)
Fitness Friendship Fun
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AndySmith Quote  Post ReplyReply Direct Link To This Post Posted: 04/11/2019 at 9:24am
Brand: Butterfly
Rubber ID/Model: Dignics 05
Thickness: 2.1
Colour: Red
Uncut Mass: 70.21g
Length: 180
Width: 168
This was a great signature until I realised it was overrated.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sedis Quote  Post ReplyReply Direct Link To This Post Posted: 04/20/2019 at 2:27am
Brand: Gambler
Rubber ID/Model: Reflectoid
Thickness: 1.5mm
Colour: Black
Uncut Mass: 45g
Length: 166
Width: 166
Measured sponge hardness: 44° Shore O

Brand: Gambler
Rubber ID/Model: Reflectoid
Thickness: 1.5mm
Colour:Red
Uncut Mass: 46g
Length: 166
Width: 166
Measured sponge hardness: 45° Shore O
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Post Options Post Options   Thanks (1) Thanks(1)   Quote haggisv Quote  Post ReplyReply Direct Link To This Post Posted: 04/20/2019 at 7:38am
Database updated up to this point, a massive number added, thanks everyone for posting! Thumbs Up

Edited by haggisv - 04/20/2019 at 7:40am
Smart; VS>401, Dtecs OX
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vanjr Quote  Post ReplyReply Direct Link To This Post Posted: 04/22/2019 at 10:13am
Brand: Gambler
Rubber ID/Model: 7S
Thickness: 2.1
Color: red
Uncut Mass: 59.9 g
Length: 163
Width: 163
sponge hardness: na

Brand: Gambler
Rubber ID/Model: Mechtek
Thickness: 1.9
Color: red
Uncut Mass: 61.5 g
Length: 163
Width: 163
sponge hardness: na

Brand: Gambler
Rubber ID/Model: Mechtek
Thickness: 1.5
Color: red
Uncut Mass: 55.8 g
Length: 164
Width: 163
sponge hardness: na
Gambler Hinoki Vector blade; Double inverted. Or some LPs.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hans Regenkurt Quote  Post ReplyReply Direct Link To This Post Posted: 05/09/2019 at 11:57am
Brand: 729 / Friendship
Rubber ID/Model: Presto Spin 46 MAX
Thickness: 2.15
Colour: Black
Uncut Mass: 67g
Length: 170
Width: 165

density estimate: 0.23 gr / cm2

Brand: 729 / Friendship
Rubber ID/Model: Presto Speed 46 MAX
Thickness: 2.15
Colour: Red
Uncut Mass: 68g
Length: 165
Width: 165

Density estimate: 0.24 gr/cm2

Brand: Tibhar
Rubber ID/Model: MXP Hard 50
Thickness: 2.1
Colour: Red
Uncut Mass: 76g
Length: 169
Width: 179

Density estimate: 0.25 gr/cm2

I have bought a black one and it weighs 78 gramms uncut.
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