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 American flag should always be to the left in the eye of the viewer. 2  When flying a flag underneath the American flag, on the same pole, it should be at least one size smaller.  If flying next to state and company flags, the American should be the left.