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Topic: material density help  (Read 5802 times)

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Offline thr33k

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material density help
« on: July 15, 2011, 11:08:11 AM »
Hi all,

I really need some help to find a material that has a density of 0.78 +- 0.03 and is a solid at room temperature. The closest I've been able to find is Polymethylpentene, does anybody know of a better match? Thanks,

James

Offline Stepan

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Re: material density help
« Reply #1 on: July 15, 2011, 07:55:00 PM »
you can make a composite material of any density by blending any polymer with hollow glass micro capsules (3M makes them)

Offline thr33k

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Re: material density help
« Reply #2 on: July 17, 2011, 04:52:04 PM »
Ah thanks for that, I'll look into those!

Offline typhoon2028

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Re: material density help
« Reply #3 on: July 18, 2011, 10:42:09 AM »
what about a foam?

Offline Enthalpy

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Re: material density help
« Reply #4 on: August 07, 2011, 08:18:52 PM »
People develop very porous molecules for hydrogen storage. Hugely lighter than your figure. They're hollow, but at molecular scale. Making them less light would be easy.

Aerogels as well are extremely light, due to porosity at a very small scale.

Or you have alkali metals, but with serious drawbacks...

Offline Enthalpy

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Re: material density help
« Reply #5 on: August 13, 2011, 02:24:39 PM »
Wood of course, provided it fits your other requirements.

By choosing the proper species, you can get any density between <160kg/m3 (Balsa) and >1400kg/m3 (African blackwood).

Some varnish maybe?

Offline typhoon2028

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Re: material density help
« Reply #6 on: August 15, 2011, 03:00:51 PM »
polypropylene foam
polyethylene foam
polyurethane foam

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