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 patches of the National Colors are worn with the blue field always facing front, because they are never to be in retreat. When the patch is on the left shoulder, it is facing forward with the field in its proper place. the only wrong way fora flag to face is upside down, except in times of distress.