Ultra Clean containers feature a proprietary cleaning process that removes up to 99.5% of particles that are 5 microns and larger. Designed for those needing containers cleaned for general lab use or fluid sampling. The typical cleanliness level for containers less than 100ml is less than 200 particles per container that are larger than 5 microns. For larger containers, the typical cleanliness level is less than 2 particles/ml that are larger than 5 microns.