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.
Army Regulation 670-1 states, âthe American flag patch is to be worn, right or left shoulder, so that âthe star field faces forward, or to the flagâs own right. When worn in this manner, the flag is facing to the observerâs right, and gives the effect of the flag flying in the breeze as the wearer moves forward.â.