Comfortboard 80 is rigid stone wool board with a density of 8 pounds per cubic foot and is a great option for acoustic projects that require a rigid material. It’s also used in some bass trap designs.
For smaller quantities, try Rockwool Comfortboard 80 Single Pieces.
For more detailed information, see Selecting the Right Acoustic Material for a comparison of these materials.
Just sent off my first audition post-cleanse and man oh man, WHAT a difference! Thanks George & ATS for helping me to take it to the next level! - Mark More reviews and photos...