The model 2810-005 coefficient of friction fixture is a testing fixture to measure the static and kinetic coefficient of friction of plastic film and sheet using the ASTM D 1894 standard.
The major items of the fixture include a 200 g square metal sled wrapped with a 1/8 in (3.2 mm) thick foam pad and a rectangular shape metal table with a defined surface finish. A pulley is located at one end of the table which allows the sled, when attached to the crosshead via a nylon or metal tow line to be pulled horizontally along the plate. Test material can be attached to either the sled or the plate or both.
The coefficient of friction fixture mounts in the testing system load frame using Instron’s standard type D base grip adapter. The tow line attaches directly to the load cell.
Principle Of Operation
The coefficient of friction test fixture consists of a horizontal table and a moveable sled. Both the table and sled are covered with the test material. A tow line attaches to the sled and a low force load cell with a pulley guiding the tow line during the test. The fixture is mounted to the base of the instrument and, as the crosshead/ load cell moves, the sled is pulled across the horizontal table.
Data is recorded from the load cell during the test and analyzed to determine both static and kinetic friction.
The static friction is derived from the first maximum peak (force) on the load curve and kinetic friction is derived from the average force between two predefined points. The coefficient of friction is defined as the recorded force divided by the weight of the sled.