Bingo! Search for formaldehyde free MDF and you'll see a few different brands like Medite. The dust is less toxic than MDF and it might be denser and less susceptible to damage from moisture. Looks like good stuff but it is going to be harder to find. Gotta love ED's penchant for obfuscation //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gifIts most likely not called EFS, thats probably the name they came up with.