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.
USA Flag (United States of America Flag). The flag of the United States, known as Old Glory, consists of thirteen horizontal red and white stripes and fifty white stars in a blue rectangle in the top left corner. The current American flag design was adopted on July 4, 1960.