Lowest Elastic (Young's) Modulus Elastomer?

[BarryLyndon]

Anyone know what elastomer or TPE holds the crown for having the lowest elastic (Young's) Modulus? Several nearby competitors may also be useful when it comes to comparing other properties. Is is natural rubber, LDPE/UHMWPE, Resilin, or something else?

Thanks for any enlightenment your willing to share.

Best-

 

[Compositepro]

Elastomers are visco-elastic and can be formulated to have close to zero modulus. Modulus depends strongly on temperature and frequency, as well as formulation. There is no simple answer to your simple question.

 

[BarryLyndon]

Good answer; my question is bad. I'm still learning, so thanks. I'll try and phrase a better question.

I need an elastomer (or TPE) that requires very little force to be easily elongated whilst always remaining solid in typical outdoor temperatures. If it can have some decent abrasion resistance, that is a plus but not required. Any suggestions?

 

[cloa]

What sort of elongation with with what pressure?
What sort of temperatures high to low? At low temperatures, it might be brittle.

 

[BarryLyndon]

These are ballpark figures; some give and take can likely be achieved, especially with temperature, but roughly:

35N (8Lbs) force applied (maximum)
28%-33% elongation needed (minimum)
-26C to 41C (-15F to 105F) (maximum)

 

[cloa]

Approx dimensions?

 

[BarryLyndon]

Roughly 3" x 2" x 1/4" at max.

 

[btrueblood]

Silicone rubber?

 

[BarryLyndon]

Maybe. I think Silicone Rubber probably has the temperature range covered due to it's glass transition temperature, and it might have the elongation as well. I'm a bit hesitant to think Silicone can endure enough abrasion, but I don't have data yet on how much it's going to have to take. It seems like durability and elasticity are a bit at odds, which is why I was originally just looking for something so elastic that I could reduce the quantity to where it's almost out of the way of getting roughed up, but I'm thinking I'll have to go the other direction. If only there was a solid substance that stretched on one or two axis but not so much on a third. Then you start getting into textiles and such but they aren't solid per se. Thanks for the suggestion.