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.
1 If you are putting the American flag between other flags, it must be in the middle or the highest point.  If you are crossing poles, the American flag should be on the right (the flag's own right), and its pole should be in front of the pole of the other flag.