ISO 8295 Coefficient of Friction Plastic Film and Sheeting

Instron’s 6800 series frames are capable of data capture up to 5 kHz to ensure that all fast-changing test events are captured. Too low of a data capture rate may lead to missed force peaks and troughs, resulting in an inaccurate average strength value. For ISO 8295 testing we recommend a 6800 series single column frame equipped with a low force (5 – 100 N) 2530 series load cell depending on the expected frictional forces. This test requires the use of Instron's 2810-005 Coefficient of Friction fixture, which is specifically designed to meet the requirements of ISO 8295 and ASTM D1895.

The ISO 8295 test method is used to investigate the static and dynamic frictional properties of film and sheet plastics when sliding against either itself or another material. This method is intended to be used for non-sticky plastic film and sheeting of up to 0.5 mm in thickness. To perform this test, the specimen is supported on a friction table consisting of a horizontal test table, a sled, and a driving mechanism which uses a pully to produce a relative motion between the sled and the test table. One piece of the specimen is attached to the table with double-sided adhesive tape while the other piece is secured to the sled in the same way. The test machine then drags the sled across the table at a constant rate of displacement, causing friction between the two pieces of material. The force is recorded, and test results are calculated. As always we suggest reviewing the full ISO 8295 standard to fully understand the testing requirements.

Instron’s 6800 controller can accurately measure forces down to 0.1% (1/1000th) of the 2580 series load cell's capacity, enabling the measurement of very low forces, potentially eliminating the need for multiple load cells. The lowest capacity 2580 series load cell is 500 N, meaning that it can maintain 1% accuracy from 0.5 N to 500 N. Instron’s 2530 series load cells can maintain 1% accuracy down to 1/250th of the cell’s capacity when used on a 6800 frame. The lowest capacity 2530 series load cell is 5 N, meaning it can maintain 1% accuracy from 0.02 N to 5 N. Forces beneath the lower limits of the 2580 and 2530 series cells can be measured, but Instron cannot guarantee 1% accuracy.