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 Union (also known as the blue rectangle the stars call home) sits at the upper left corner of the flag when flown from the flag pole. When hung against something (like a wall or the side of a building), the Union also sits at the upper left corner.