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Foamed Aluminum

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S

scholl

Member
Joined 2012
I'm testing the waters for supplying Foamed Aluminum sheets to DIYers. I have two sizes, 1/2" closed cell, which is stiff like iron but much lower mass and 1" open cell which is even lower mass and has excellent acoustic absorption properties.

The 1/2 closed cell is excellent for constraining layer designs but with the added benefit of RFI\EMI shielding. Great for shelves, turntable bases and cabinet damping.

The 1" open cell is excellent for equipment feet, cabinet damping and acoustic panels.

Both sizes come in 19" by 15.75" sheets at $125.00 for the 1/2" and $100.00 for the 1" sheets.
 

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S

scholl

Member
Joined 2012
JonSnell Electronic said:
Who would want this product? Aluminium is brittle, resonates and is useless for acoustic employment.
Click to expand...

Aluminum in it's foamed form takes on different properties than the same amount of material in sheet form. The 1/2" closed cell simply doesn't bend unless very high force is plied. And it's surprisingly non-resonant. When I suspend a sheet by two fingers at a corner and give it a knuckle wrap by an RTA the response is flat to 1Khz and dies quickly. No peaks, is very good for broad band control.

This stuff is used in high speed trains and very expensive RVs to control vibration. Not to mention a very expensive turntables too.

It's relatively new and manufactured by only a few companies.

Few audio enthusiasts have seem this material to experience it's properties.

This is a raw product with inherent natural properties, not snake oil.
 
S

scholl

Member
Joined 2012
When this material is stuck with a hard object a slight resonance at 160-250hz is seem.

Ad your favorite viscoelastic layer for an excellent damping panel or green glue the 1" open cell to 50% area of speaker cabinets for both damping and heat conversion of internal pressures.
 
A

AndrewT

R.I.P.
Joined 2004
I was watching an old documentary (on the History channel) last week.
It was all about the Vulcan bomber.

I was really surprised to see that the 1952 prototype has honeycomb cell composite panels in it's construction and that they were shown in their disassembled stage.

I thought these composites were a fairly new invention !
I also think that since the "secrets" were revealed that the composite must have existed for a long while before the documentary was made (possibly in the 1960s)

Any ideas on when composites became commonplace/usable?
aerolam, aluminium composite panel.

The closed cell foamed aluminium looks like a cheaper version of aerolam.
 
M

mt490

Member
Joined 2010
I think, observing from the responses you've got already, there is interest but you simply need a better sales pitch.

I mean you lack both hard statistics about what I can do with the material (i.e numerals- like bending stress limits, acoustic attenuation etc.), as well as no demonstrations of applications at hand.

Sure, a piece of 80gsm isn't used with such detailed information supplied about it, but your product isn't an everyday product that everybody knows what to expect from it - not yet, anyway.
 
S

scholl

Member
Joined 2012
mt490 said:
I think, observing from the responses you've got already, there is interest but you simply need a better sales pitch.

I mean you lack both hard statistics about what I can do with the material (i.e numerals- like bending stress limits, acoustic attenuation etc.), as well as no demonstrations of applications at hand.

Sure, a piece of 80gsm isn't used with such detailed information supplied about it, but your product isn't an everyday product that everybody knows what to expect from it - not yet, anyway.
Click to expand...

I'll get more info soon.

Thanks for the advice!
 
badman

badman

Member
Joined 2003
pothaudio.com
mt490 said:
I think, observing from the responses you've got already, there is interest but you simply need a better sales pitch.

I mean you lack both hard statistics about what I can do with the material (i.e numerals- like bending stress limits, acoustic attenuation etc.), as well as no demonstrations of applications at hand.

Sure, a piece of 80gsm isn't used with such detailed information supplied about it, but your product isn't an everyday product that everybody knows what to expect from it - not yet, anyway.
Click to expand...

Good advice- there are some who would get it "just to play" but for most, they want some more clear guidelines of how they'd best apply it.
 
B

benb

Member
Joined 2010
Among other questions, I'd want to know what percentage fill (vs. solid aluminum of the same dimensions) these are.

I should be working on becoming "rich and retired" this very moment instead of posting here, but if I already were I'd order this and report on my own measurements. For now I'm looking forward to seeing what others do with it. An offhand thought is a super-light turntable platter.
 
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