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Has Anyone Ever Heard of Dead Rubber?

02/06/2020 11:07 AM

Years ago I had two rubber balls. When you would pick them up they appeared identical in every way. Weight, surface feel, hardness, I mean they seemed identical in every way.

Until you dropped them!

One would bounce with great vigor like a "Superball"

The other would hit the floor with a satisfying thud, if it left the floor with a re-bound or bounce, it was undetectable. I remember it being called "Dead" rubber.

What is it really called? and is there a specification for this "Deadness" like Durometer is for hardness?

I'd like to find some of the deadest sheet rubber possible.

Joe

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#1

Re: Dead Rubber

02/06/2020 11:38 AM

Do you have a hardness range? The company I work for makes soft impact absorbing polymer sheets.

Depending on volume, we can tailor a formula to fit your needs. If you are just looking or a one-off, One of our competitors, Sorbothane can be bought through McMaster Carr.

3M also sells a line of dampening materials they call isoloss under the EAR trademark.

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#3
In reply to #1

Re: Dead Rubber

02/06/2020 12:13 PM

Hi Troy,

I have a 0.625 " dia Ball bearing that falls about 6" to a hard surface, and want to make the impact quieter.

So a round that is like 0.625 in diameter, or a sheet I can cut my own. Thickness?

That is hard to say. How thick would it need to be to absorb that energy?

I am currently using some self stick on ummm "Feet" you know you put them on the bottom of things to protect like the table tops from getting scratched?

But these are still too hard.

Joe

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#4
In reply to #3

Re: Dead Rubber

02/06/2020 12:23 PM
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#10
In reply to #3

Re: Dead Rubber

02/07/2020 12:28 AM

If you drop a weight onto a rubber/polymer surface it will rebound in the following order from lowest bounce to highest bounce:

V - Fluoro elastomer - viton

K - Nitrile

N - Acrylonitrile butadiene - Nitrile

EP - Ethelene propylene

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#12
In reply to #3

Re: Dead Rubber

02/07/2020 12:38 PM

If you are located in the US I can send you a few samples of various hardness and thickness to try. Just send me a PM with your contact info.

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#14
In reply to #3

Re: Dead Rubber

02/08/2020 2:23 PM

Filling a soft sided container with a viscous fluid could provide quiet landings.

Hot water bottle or doubled heavy duty ziplock bags filled (don't fill to capacity and do get all the air out) with something like corn syrup , motor or cooking oil, laundry detergent, or creamed corn, can provide a sound deadening landing pad.

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#2

Re: Dead Rubber

02/06/2020 11:54 AM

...."The ball that doesn't bounce is made of a special kind of rubber, called butyl rubber. Butyl rubber is synthetic, or manmade, rubber that absorbs the kinetic energy from the ball falling. Butyl rubber used in athletic shoes can help absorb the impact of your feet as they hit the ground. It can also make things very airtight when the insides are lined with butyl rubber, like basketballs, footballs and soccer balls. You may even find some chewing gum that includes food-grade butyl rubber to keep you chewing!"...

https://www.hawaiinewsnow.com/story/12840995/weird-science-with-dr-v-bounce-vs-no-bounce/

https://www.amazon.com/Durometer-Smooth-Finish-Backing-Thickness/dp/B000MAL0K2/ref=sr_1_2?qid=1581008729&refinements=p_n_feature_seven_browse-bin%3A3071283011&s=industrial&sr=1-2

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#15
In reply to #2

Re: Dead Rubber

02/08/2020 9:12 PM

Cut a sphere out of a flat sheet....

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#18
In reply to #15

Re: Dead Rubber

02/09/2020 9:30 PM

Hey - Thanks: not sure how directly relevant that was, but it sure is useful!

Can you specify the shape mathematically?

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#19
In reply to #18

Re: Dead Rubber

02/10/2020 3:35 AM

It's a little complicated...or you might just follow a soccer ball pattern of 5 and 6 sided geometric patterns...

http://erikdemaine.org/papers/SphereWrapping_CGTA/paper.pdf

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#5

Re: Has Anyone Ever Heard of Dead Rubber?

02/06/2020 1:54 PM

We had a trick in the old magic shop that was exactly what you describe.

I think I thought there may have been an embedded ball bearing in one ball?

The only way to trick someone was for them to belive that there was only one ball and it would bounce / or not as directed.

....perhaps you inherited some magicians props with a misleading story?

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#6
In reply to #5

Re: Has Anyone Ever Heard of Dead Rubber?

02/06/2020 2:58 PM

No, it was real,

It came actually from some rubber manufacturer it had a special box and all. But it was a like fun promo thing from some rubber company

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#7
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Re: Has Anyone Ever Heard of Dead Rubber?

02/06/2020 4:08 PM
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#8

Re: Has Anyone Ever Heard of Dead Rubber?

02/06/2020 4:19 PM

This may not answer your question but is related to it:

https://framingnailersguide.com/dead-blow-hammer-vs-rubber-mallet/

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#9

Re: Has Anyone Ever Heard of Dead Rubber?

02/06/2020 6:41 PM

It isn't rubber but the vibration labs used to recommend Delrin for fixturing. They said that from a vibration fixture point of view it was very dead.

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#11

Re: Has Anyone Ever Heard of Dead Rubber?

02/07/2020 5:10 AM

<...One would bounce with great vigor like a "Superball"...>

Temperature is an important consideration. When cooled to -180degC in liquid nitrogen, a <...Superball...> will shatter like glass when dropped from, say 4ft onto a hard floor, for example (been there, done it, secondhand T-shirt now on a popular internet auction site).

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#13

Re: Has Anyone Ever Heard of Dead Rubber?

02/08/2020 7:56 AM
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#17
In reply to #13

Re: Has Anyone Ever Heard of Dead Rubber?

02/09/2020 9:18 AM

Sorbothane is available in sheet form if needed at the above link.

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#16

Re: Has Anyone Ever Heard of Dead Rubber?

02/08/2020 10:59 PM

My brother in law was one of the top blokes of the Rubber Research Institute of Malaysia's pre-retirement and he says that pure rubber/latex can easily achieve what you want BUT butyl rubber, a copolymer of isobutylene with isoprene, (as Solar Eagle mentioned) would be the better option for one very simple reason – cost.

He further stated that if it is on a floor it should be about 5mm thick butyl rubber and a desk/bench top about 3mm thick butyl rubber (depending on the desk/bench surface) if they are to be removable sheets.
Again with the BUT’s – If it is for a floor in a high traffic area he suggested a floor coating of ???? 400micron thick (He can’t remember the products name, save they are yanks and Woody’s son has an agency here – he’ll check – or I shall be forced to have a beer with Woody…bugger) with a 3mm thick butyl rubber wear mat. See pic.

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#21
In reply to #16

Re: Has Anyone Ever Heard of Dead Rubber?

02/10/2020 9:32 AM

Looks a lot like Sorbothane;refer to link in my previous post

Sorbothane® sheet stock is available in an array of sizes, thicknesses and durometers. Available with and without PSA sheets, they can be custom-cut or water-jet-cut.

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#20

Re: Has Anyone Ever Heard of Dead Rubber?

02/10/2020 4:44 AM

I haven't heard of 'dead' rubber in this context though a lead filled hammer which has no rebound when it strikes is often called a dead hammer.

Focusing on the words, a dead rubber is a term in the card game bridge where a rubber is the collection of games or hands played and one pair wins. A dead rubber is one where hands are still being played when only one pair can win. And, yes, material science is a cinch compared to explaining how one plays contract bridge!

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#22

Re: Has Anyone Ever Heard of Dead Rubber?

07/07/2020 12:21 AM

Really, Josehenry1800 (who, at the time of this post, joined within the last 24 hours and has all of one post), this is the way you introduce yourself and your website?

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#23
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Re: Has Anyone Ever Heard of Dead Rubber?

07/07/2020 4:32 AM

Sorry to hear that. I will must contribute here.

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