We have recently reported polysiloxane elastomers with elongations of 5000%.

see:Article: Soft Materials with Recoverable Shape Factors from Extreme Distortion States

Jonathan Goff · Santy Sulaiman · Barry Arkles · James P Lewicki

[Show abstract]

Full-text · Article · Jan 2016 · Advanced Materials  available on researchgate

I remember stretching some Kraton rubbers once. If I recall correctly, I reached 1300% or so.

A cured film of natural rubber latex can also give very high values of elongation at break(even 1500% and above is possible)

@antonio @john and & @kodandaraaman : dear sirs thank you so much for your kind replies. Sir.kodandaraman and sir.john, i am working on stretchable sensors. I successfully made upto 600% strains measurable sensor using latex rubber. "could you please send me the procedure or supporting papers to make/ achieve that much (1300/1500)" [email protected]

(i will be very thankful o you and sorry i am not good in english)

@Sreenivasulu,

This was ~ 20 years ago, so the details are foggy, but I think I took the Kraton (it's called Cariflex outside the US), dissolved it in toluene, make a thick film which I dried in an over to remove the toluene and leave the Kraton behind.

Dear Mr Sreenivasulu,

Simply buy a natural latex based condom and cut a piece from it and test for tensile properties-you should get at least 1200% elongation at break.

regarding Kraton or Cariflex-I think both are thermoplastic rubbers based on styrene-butadiene-styrene block copolymers- a thin film should give you high elongation at break

@Sir.Kothandaraman and @Sir.John : THANK YOU SO MUCH SIR.

There are several types of elastomers exhibiting very high elongations at break. Some phase-segregated polyurethanes or butadiene-based elastomers, especially composed of high contents of low-Tg segments, have values of strains at break as high as 2,000% or more. Thin films of these materials can be extended reversibly to 2,500% without breaking. In general, crosslinking (chemical or physical) and phase-separated morphology promote elastomeric behavior of a polymer.

Compared with polybutadiene, natural rubber and polychloroprene should be better because these two polymers show strain induced crystallisation and hence can sustain larger deformations. In case of polybutadiene, it does not show this property and further, any crystal formed on stretching of this rubber, will melt at temperatures close to 0 deg C while those of Natural rubber and poly chloroprene have higher softening points(near 40 degC).

Gelest has invented a new type of silicone rubber capable of 5000% elongation to break

We have recently reported polysiloxane elastomers with elongations of 5000%.

see:Article: Soft Materials with Recoverable Shape Factors from Extreme Distortion States

Jonathan Goff · Santy Sulaiman · Barry Arkles · James P Lewicki

[Show abstract]

Full-text · Article · Jan 2016 · Advanced Materials  available on researchgate

very interesting . I would like to read the article

3500% achieved by our novel elastomer