Ultra High Purity CFOS Tubing

Featuring Critical Systems’ CFOS-1000 Treated UHP Tubing

CSI’s CFOS-1000 product is produced from the highest quality tubing mills in the world.  Our CFOS-1000 process is state of the art and exceeds the standards set by the Compressed Gas Association requirements under Pamphlet CGA G4.1 and ASTM G93 for cleaning requirements related to ‘Cleaned for Oxygen Service’ applications.

CFOS-1000 is made of 316L Stainless Steel and is manufactured to ASTM A269 / A213.  Standard Size Ranges are (1/4″ inch) through (1 inch) Outside Diameter. Other sizes are available upon request.

Critical Systems has developed a Nitric Acid Passivation Process that not only removes the harmful free metals and hydrocarbons from the Stainless Steel internal surface but also enhances the Chrome to Iron ratio at the surface for added corrosion resistance. Contact us today for pricing and availability on your high purity requirements.


Since 1998, Critical Systems, Inc. (CSI) has been providing Gas Cabinet, Valve Manifold Boxes & Gas Abatement Systems (Gas Cabinets and Gas Scrubbers, etc.), and Orbital Welding Rental, Lease, Repair and Training Services related to process tool facilitation for Semiconductor, Biotech, Pharmaceutical and related industries. Company headquarters are in Boise, ID, with additional locations in Burnsville, MN, and Shrewsbury, PA, Austin, TX and Draper, UT.