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Bouncing Putty
plastelina.sk (Wikimedia Commons) · CC BY-SA 2.0
Clay

Imeundwa na

Clay

22. Septemba 2026DK
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Bouncing Putty

Looking for a synthetic rubber during the Second World War, James Wright at General Electric heated silicone oil with boric acid. The result was no rubber: it bounced, shattered under a hammer, stretched like toffee when pulled slowly and slumped into a puddle overnight. Nobody found an industrial use; in 1950 it was sold as a toy. **US 2,541,851**, "Process for making puttylike elastic plastic, siloxane derivative composition containing zinc hydroxide", Wright, assigned to General Electric, filed 23. December 1944, granted 13. February 1951: liquid dimethylsiloxane heated with 5 to 25 % by weight of a boron compound such as boric acid or borax. **You measure both of its lives**: how high it bounces, how fast it flows, and where one turns into the other.
Mwanzo
1 hour plus a day of slumping

Maagizo

1

Weigh a ball

Weigh out 20 g of bouncing putty and roll it into a smooth ball between your palms.

Vifaa kwa hatua hii:

Udongo unaorukaUdongo unaoruka20 g

Zana zinazohitajika:

Mizani ya dijitali ya usahihiMizani ya dijitali ya usahihi
2

Bounce it

Tape a tape measure up a wall. Drop the ball from 1.0 m onto a hard floor five times, filming in slow motion, and read each rebound height.

Vifaa kwa hatua hii:

Utepe wa kufunikaUtepe wa kufunika1 rolii

Zana zinazohitajika:

Tepi ya kupimiaTepi ya kupimia
Simu Yenye Video ya Mwendo wa TaratibuSimu Yenye Video ya Mwendo wa Taratibu
3

Pull slow, pull fast

Roll a 10 mm thick rope. Pull one over 10 seconds: it strings out. Pull another sharply: it snaps with a clean face. Try pull times in between and note the fastest pull that still stretches.

Zana zinazohitajika:

Saa ya kupima mudaSaa ya kupima muda
Rula ya chumaRula ya chuma
4

Strike it

Glasses on. Set a ball on a hard surface and hit it once, sharply, with the mallet. It cracks rather than squashing. Squash another slowly with your thumb.

Zana zinazohitajika:

Nyundo ya mpiraNyundo ya mpira
Miwani ya usalama iliyo waziMiwani ya usalama iliyo wazi
5

Let it slump

Re-roll the 20 g ball and set it on wax paper on a level surface. Measure its diameter now and after 10, 30, 60 and 180 minutes and 24 hours.

Vifaa kwa hatua hii:

Karatasi yenye ntaKaratasi yenye nta1 karatasi

Zana zinazohitajika:

Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
6

Deborah numbers

Inapakia daftari la Jupyter…
7

History & Context

**What the patent specifies:** liquid dimethylsiloxane heated with 5–25 % of a boron compound until putty-like. **Modern build (derived):** commercial bouncing putty, measured. It became a famous toy and a staple of physics teaching about materials that are neither simply solid nor simply liquid. Its limits: it picks up dirt, will not hold a shape, and flows out of any container that is not closed.

Vifaa

3

Zana Zinazohitajika

8

Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Silicone (Rochow Direct Process)

Silicone (Rochow Direct Process)

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Utengenezaji wa Plastiki

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Butyl Rubber

Butyl Rubber

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Mitambo

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