ISO 8295 Plastics Film and Sheeting, Determination of the Coefficient of Friction 

ISO 8295 coefficient of friction thin films and sheeting

ISO 8295 is a standardized test method used for determining static (μ_s ) and kinetic (μ_k ) coefficients of friction of plastic film and sheeting. Plastic film is a widely used material in the packaging industry. Within the packaging industry, one can separate the use of film into two categories: food packaging such as produce bags, carton liners, or meat seal wrap, and non-food packaging such as envelope liners or potting soil sacks. Outside of the packaging industry, plastic films are used for an assortment of products: trash bags, can liners, I.V. bags, construction liners, and barriers to name a few. The frictional properties of these films must be characterized and controlled to ensure the experience of the end consumer is acceptable.

Materials Testing System

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.




ISO 8295 Test Setup
1) 6800 Series Universal Testing System
2) Bluehill Universal Software
3) 2530 Series Load Cell
4) 2810-005 Coefficient of Friction Fixture

 

ISO 8295 coefficient of friction thin films and sheeting

How to Perform a Test to ISO 8295

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.

Tips and Tricks 

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.

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2530 Series Low Force Load Cells

Instron 2530 series load cells are specifically designed for use with any of Instron's low force testing systems. Force capacities range from ±5 - ±100 N (0.5 – 10 kgf, 1.12 – 22.5 lbf) with a wide measurement range allowing force to be measured down to 1/500th of the load cell's capacity.

2580 Series Load Cells

Instron 2580 series load cells are specifically designed for use with 5900 and 6800 series testing systems and offer exceptional performance with the ability to measure forces as low as 1/1000th of the force capacity to an accuracy of 0.5% of reading.

2810-005 Coefficient of Friction Fixture

Instron's 2810-005 Coefficient of Friction fixture measures the static and kinetic coefficient of friction of plastic film and sheeting using the ASTM D1894 or ISO 8295 standards.