What is the best thin/light material to kill/absorb sound? Sorbothane?

I am currently building a box filled with electronics and I now look to isolate the sound a bit with the lightest and best material out there.

What I am looking for is a thin, lightweight and very soundproof material. I came across a material called Sortbothane and it seems like a very good fit.

0.04" of Sorbothane Will Absorb up to 4 dB

That number is pretty impressive I must say and the material seems to be reasonable light and thin as well.

So to my question, do you think Sortobothane is the way to go or is there any other materials out there with the same/better soundabsorbing?

I am also thinking to combine a few materials to make it very solid. For instance I am planning to use a small layer of silicone as well.

• Sadly thin and light materials are essentially the opposite of what you need to absorb sound the best. If you're going specifically for thin and light it seems like a good option though. It does seem to dissipate energy very well.
– JMac
Apr 4 '17 at 12:48
• Yea exactly the thicker the better of course! But as the model I have is pretty small i need it to be very thin. Yeah it seems to be a very good option! Apr 4 '17 at 13:04
• I am thinking about maybe using sorbothane and also make a thin layer of silicone around it to try to absorb even more. Apr 4 '17 at 14:06
• Sorbothane is definitely a "legitimate" material for vibration isolation, but whether you believe a claim from "some random guy on Ebay" is a different matter - especially since the claim only says "up to 4dB, so if you get 0.01dB you don't have any legal grounds to complain. Google for some suppliers with real technical data, like thorlabs.com/newgrouppage9.cfm?objectgroup_id=6421 Apr 4 '17 at 14:39
• @alephzero You can't really measure acoustic performance in dB reduction anyways. The dB reduction will vary based on frequency as well as material, so it will cut out some pitches better than others.
– JMac
Apr 4 '17 at 16:36