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 The U.S. Flag should be placed above all others if multiple flags are on the same staff.  When flags are displayed in a row, the U.S. flag goes to the observer's left. Flags of other nations are flown at same height. State and local flags are traditionally flown lower.