From what I understand, the durability between the two is quite different. The PTFE membranes are used for the filtration of organic solvents where as the PVDF membranes are generally for low protein binding. Furthermore the PTFE membranes typically require a polyethylene support.
When the U.S. and Washington State flags are flown from a cross staff, the U.S. flag flies from the peak and the Washington State flag occupies the position on the right end of the cross staff (the observer's left). Additional Information on Display US Flags.
4. Your Heart is Not on the Left Side of Your Chest. Although most of us place our right hand on our left chest when we pledge allegiance to the flag, we really should be placing it over the center of our chest, because that's where our hearts sit.