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.
The U.S. flag should be flown from the position of honor on the flag's own right, or from the flagpole on the left as normally viewed by the observer. The Washington State flag should be flown from the second position of honor, or from the flagpole on the right as normally viewed by the observer.