Masterflex tubing is specially formulated and extruded to provide the high performance and long life when used with a Masterflex peristaltic pump. Masterflex tubing is manufactured to tight tolerances of Masterflex® pump heads to ensure accurate flow rates and long tubing life. Masterflex tubing is optically inspected and factory tested—ensures clean, defect-free tubing that performs to specifications. Lot-to-lot consistency provides Manufactured to tight tolerances of Masterflex® pump heads to ensure accurate flow rates and long tubing life. Fourteen pump tubing formulations are available, each with different chemical compatibility properties, agency approvals, and performance characteristics. Norprene®, PharMed® and Tygon® formulations are the firmest offered; C-FLEX® and silicone are the softest. Firm tubing has longer life, better pressure generation, stronger vacuum/suction lift, and lower gas permeability than soft tubing .