... are constructed from compressed ,100 ppi(Z) open-cell polyurethane foam that is free from organic contaminants such as silicone ,amide ... Laundered and packed under an ISO Class 4 Cleanroom, The foam exhibits low particulate and ionic content. It has excellent ... excellent absorbency and solvent-holding capacity . Cleanmo has the following foam head swabs : CM-FS750 (TX750B), CM-FS750D (TX750D), ...