Stretch material

[Kerrie]

Hello,

I am looking for a stretch material than has linear resistance. For example, the material starts with weak resistance and then progressively increases with resistance.

I am also looking for a stretch material that can achieve over 800% elongation with good recovery.

Please let me know if anyone has any insight.

Thank you for your help!

Regards,
Kerrie

 

[Demon3]

Here you can find Kraton SBS with elongation to break of 900%. That should work.

http://www.kraton.com/products/nonwovens/elastic_nonwovens_brochure.pdf

Chris DeArmitt PhD FRSC
President

Plastic materials consultant to the Fortune 100

http://www.phantomplastics.com

 

[Compositepro]

Most elastomers behave as you describe. The increasing resistance to stretch is due to molecules becoming more aligned by stretching. The "good recovery" requires that the material be cross-linked so it does not creep as much when stretched.

I would recommend a bungee cord because the braided fibers around the rubber core prevents necking, but you can only get 200-300% elongation. Natural rubber may be your best bet. You might also look at Spandex.