"The most effective thickness for lower frequencies (such as a lot of bass) then you need a thicker foam to have a good effectiveness. If you have more higher pitched frequencies and not as much bass, then you don't need as thick of a foam."
Whats the job for a foam block
Yes, plastic can absorb sound to some extent, depending on its thickness and density. However, it is not as effective as other materials like foam or fabric in absorbing sound.
"The definition of Acoustic Studio foam is acoustical absorbers, diffusors, sound barriers, construction materials, isolation platforms and complete room treatment systems."
Whats full foam of NAH
Cheap studio foam can be found at almost any local music store. They have professional stock and beginners grade foams to perfectly fit your needs and budget.
Dissolve foam in xylene to desired thickness. Let stand until fine bubbles disperse and turns clear.
The truthful answers is: "It's the thickness you are willing to pay for". One manufacturer I know of makes memory foam mattresses in three configurations: The top 2" of the mattress is memory foam, the top 4" is memory foam, and the whole mattress is memory foam. The price varies accordingly. Personal Note: If you can't afford a memory foam mattress, try a memory foam pillow. Awesome, especially if you're a "side sleeper".
Foam paper is lightweight and has air pockets which make it buoyant, so it generally floats well in water. However, the specific buoyancy can vary depending on the density and thickness of the foam paper.
In the US, spermicidal foam is available without a prescription. It is not a very effective contraceptive on its own, but is effective when used with condoms or other forms of contraception.
The R-value of rigid foam insulation typically ranges from 4 to 8 per inch of thickness, indicating its effectiveness in resisting heat flow.
A foam mattress topper is usually about one or two inches thick. This thickness can vary depending on the topper. Look carefully at the information provided when looking at products.
Rogaine foam and regular Rogaine both contain the same amount of active ingredients. Neither is more effective than the other, since they both do the same thing.