Looking for a composite material

[calaway]

I am looking for a composite material that can meet the following requirements:

1. It is a strong material (for example it will change its shape only when you press it hard).
2. It has no harm to the body of human beings.
3. It can change its shape relatively quick after applying outside force (say pressing)
4. It will restore its original shape relatively slow after removing the outside force, say a few seconds, or a few tens of seconds. (must be slower than ordinary sponge and rubber back to their original shape).
5. Air can go though it (like a gauze), while the dust can be blocked.

Could anybody please provide some advice?
Thank you!

 

[Demon3]

The closest material I can think of is Sorbothane.

It deforms and recovers slowly to original shape.

http://www.sorbothane.com/material-properties.php

Also try Styroflex (a type of SBS).

http://www.styroflex.com

Chris DeArmitt

"Knowledge has no value except that which can be gained from its application toward some worthwhile end."
Think and Grow Rich - Napoleon Hill

 

[calaway]

Thank you very much for your help, Chris.

I have visited the links you provided. It seems that Sorbothane is quite close to what I am looking for. However, I guess it won't meet requirement 5, right? Anyway I think requirement 5 is optional. I also want to know how fast Sorbothane will recover to its original shape after removing the force. Is there any place that I can find how long it will recover to its 100%, and/or 50%, 90% of its original size/shape?

As for Styroflex, I got "domain is for sale" error after I visit the link. Could you please provide me another link?

Thank you very much!

 

[calaway]

I would like to remove the requirement 5, since it is actually optional.

 

[Demon3]

Strangely the Styroflex domain only works some of the time. You can find information on it here:

http://i

http://www.plasticsportal.com/products/styroflex.html

It extends to 400% of its length and recovers.

Looks like the Sorbothane will stretch over 35% and still recover.

If you want the material to let air through then you can make holes in it.

Chris DeArmitt

"Knowledge has no value except that which can be gained from its application toward some worthwhile end."
Think and Grow Rich - Napoleon Hill

 

[Demon3]

Not sure why I didn't think of this earlier, but the obvious material is the memory foam they use in mattresses. It is readily available, safe, just the right slow response and lets through air due to it's foam structure. Bingo.

http://www.tempur-pedic.com

http://www.dunlopfoams.com.au/Our-Products/default.asp

Chris DeArmitt

"Knowledge has no value except that which can be gained from its application toward some worthwhile end."
Think and Grow Rich - Napoleon Hill

 

[wes616]

Isn't tempur pedic a closed cell foam?

Wes C.
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