Select Products Ltd. of Portage, Mich., has announced that its
full mortise geared continuous hinge has surpassed 15 million
open/close test cycles.
According to the company, through the Physical Endurance Swing
Test, its aluminum SL11-HD hinge is mounted to an FRP door that
is 3 feet, 4 inches wide by 7 feet, 2 inches tall to simulate
a real-world situation, such as in a school entrance. A piston
initiates the door's open/close cycle 16,600 times a day, around
the clock, seven days a week, according to company information.
"We're not aware of any other independent test that has
put a hinge through this many cycles," said Bob Cronk, Select
vice president of sales and marketing. "Our unique manufacturing
processes-Pair-Matched hinge leaves, Teflon® and graphite
lifetime lubricants and anodizing after machining-combine to achieve
The hinge has been in testing at Architectural Testing Inc. in
St. Paul, Minn., since September 2002. Select says it plans to
continue the testing until the hinge fails.