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 United States Flag. Betsy Ross showing the United States flag. to George Washington and others. The flag of the United States is one of the oldest national standards in the world. General George Washington first raised the Continental Army flag in 1776, a red-and-. white striped flag with the British Union Jack where we now have stars.