5 F F The quality of these drawer runners is subject to a process of continuous monitoring. Hettich runners comply with the national and international quality standards of the markets our customers operate in. The diagrams below show some of the tests to which Hettich runners are subjected. Wear test The fully laden drawer must remain in proper working order after opening and closing it for a defined number of times at a defined test velocity Retention-on-opening test The drawer is abruptly opened all the way several times at a defined test velocity. Horizontal strain test Opened all the way, the drawer is exposed to horizontal strain from a defined lateral force. Test to DIN EN 15 338 Vertical strain test Opened all the way, the drawer is exposed to vertical strain from a defined eccentric force. Runner systems for wooden drawers Quality that meets all of demands