Determination of the Coefficient of Friction of Film
PLEASE NOTE: we recommend using the low-capacity load cell with the coefficient of friction testing package
The coefficient of friction testing package for plastic films is an add-on to the zwickiLine Z0.5 TH for film testing.
It is used for tests according to ASTM D1894/ISO 8295 Test Method for Static and Kinetic Coefficients of Friction of Plastic Film and Sheeting.
The coefficients of friction provide information about the sliding properties of plastic films and play an important role in the packaging industry in particular and are relevant both in quality control during film production and in the development of film material for technical design. They also play an important role in EV battery testing in the form of separator film.
What is the coefficient of friction?
The coefficients of friction (μ) static friction and dynamic friction are the main result of the test according to ASTM D1894. They indicate the force required to move two surfaces parallel to each other that are loaded with a weight. The lower the coefficient of friction, the easier the movement. The coefficients of friction are influenced by many factors. These include the materials of the surfaces, their roughness, the presence of lubricants, the ambient temperature and the humidity.
How is the coefficient of friction calculated?
The formulas for calculating the static and dynamic coefficient of friction are as follows:
Coefficient of static friction: μs = As/B
Coefficient of dynamic friction: μk = Ak/B