[Art Preservation Services, NY] A former brand name for humidity buffering gel and tiles. Arten Gel tiles are shallow plastic trays that contain silica gel enclosed in a nonwoven polyolefin fabric. The covering allows moisture vapor passage in both directions. Arten Gel tiles were preconditioned to a set humidity, usually 43% RH, to provide a stable moisture content in a closed environment. The Arten Gel has now been replaced by the RHapid PAK sheets that provide silica gel in a convenient packaged form.