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.
For more about the US flag... 1. OVER A STREET - When the flag is displayed over the middle of the street, it should be suspended vertically with the union (blue field of stars) to the north over an east-west street, or to the east over a north-south street.