Diane, We use Volare (sp?) a soft, dense inert foam at teh Guggenheim. Detroit Institute of Arts uses it too. Great stuff, but pricey. Sorry I don't have a source, but someone on the list must! Suzanne Quigley > Our registrar is searching for information on storage shelf >linings. Information from personal experience or suggestions for >resource material regarding properties of various foams would be >welcome. She is specifically interested in nalgene and its archival >qualities.