A while back (like a year ago) i went on a quest to find a material to silence my then pinging KUL keyboard..
I wanted a material that was thin, that would stick and worked well for sound isolation and resonance.
After a long search i came across a Dutch company called akoestiekwinkel.nl when contacting them they where sum what surprised about my queries asking me what do you mean a keyboard ??? What kind of keyboard ?? hahahha..
(very folks btw)
Well they might have bin lacking in keyboard knowledge (not surprising) but they sure knew a few things about sound and how to dampen it. So after a few emails and a few phone calls i got my sample pack.
Two samples impressed me "Tecnocell" a thicker foam like material that's ideal for filling up a space..
But the more interesting sample was called "VibraFlex that was the one i used for my FC660C case.
The result was a nicer feeling case it felt a bit heavier more substantial and the hollow sound you hear when you tap the case was dampened by a lot!! you could really tell where i had put sum and where not after assembling the case back together.
it's like dampening your upstroke on a Topre board your hear a nice thick tok instead of thin plastic..
On the plus it's easy to manage cut in to small pieces the sticky side works nicely no mess no fuss.
Also the thickness is amazing for it's performance i measured 1mm thickness well under the pcb stand offs.
This is going to be the material i'm going to use to silence my next computer build ..Well i'l probably first call them and grind them for more tips hahaha..
ps. almost forgot a second use i'm planning to test.. A while back i had the KUL keyboard and they added thin strips of sum kind of dampening material under the enter+shift keys that is where the keycap hits the metal plate..
With my FC660C i don't suffer from that problem but i do have other keyboards that could benefit from this.
I did cut one more strip and put it on the left side but left the right side alone because the controller was going there
