More D The coefficients of friction are related to the slip properties of plastic films that are of wide interest in packaging applications. These methods yield empirical data for control purposes in film production. Correlation of test results with actual performance can usually be established. These additives have varying degrees of compatibility with the film matrix. Some of them bloom, or exude to the surface, lubricating it and making it more slippery.
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This test method measures the initial and moving friction of one material being dragged across another, otherwise known as the static initial and kinetic moving coefficients of friction COF. ASTM D is commonly used for plastic sheeting but you can adapt it for nearly any product or material example: Friction of sneakers on anti-slip paint. The initial force to move the sled is used to calculate the static COF, and the average force once the sled is moving is used to calculate the kinetic COF.
It consists of two main parts, a sliding plane or plate and a sled. The test can be performed sliding material over itself or over a different material. Cut the material you are testing to the size specified by the standard. Tape the material to the plate, ensuring there are no wrinkles in the material.
Cut and tape the material or special surface to the sled using the specified method. Run the string attached to the sled through the pulley and connect it to the load cell on the testing machine actuator.
Begin pulling the string at the specified rate. Record the load when the specimen begins to move. Continue pulling the sled, making sure the data is being recorded graphically. Stop the test once the specified sliding distance has been covered.
ASTM D1894 Coefficient of Friction Film Testing
Coefficient of Friction ASTM D1894