PTFE hoses are less susceptible to cracking from stress or flexing than metal hoses.
Parker's 919J PTFE Hose features an extruded silicone jacket to provide a clean, smooth cover and 919U features a non-marring, abrasion-resistant polyurethane jacket to shield the stainless steel wire reinforcement against wear, fraying and contaminants. Parker's Chemical Resistant PTFE Smoothbore hoses have exceptional chemical compatibility and handle temperatures as high as +450 DegF. The silicone jacket on the 919J PTFE hose only reduces the lower operating temperature -40 DegF to +450 Deg. Both of these hoses are constructed of a natural FDA compliant PTFE core tube and reinforced with a 304 stainless steel braid.