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Coefficient of Friction Tester

Saicheng coefficient of friction (COF) tester is specialized in measuring the static and kinetic coefficients of friction of plastic films, sheeting, paper, cardboard, rubber, textile, metal, laminate and other similar materials.

The coefficient of friction test will help the packaging manufacturers to assess the stacking capacity of the plastic films. It contributes to preventing the accidents that usually occur due to friction in packaging, transportation, loading, etc.

Coefficient of Friction Test Standards

Saicheng coefficient of friction tester meets the following testing standards:

  • ISO 8295: Coefficients of Friction Test for Plastics, Thin Films and Sheeting
  • ASTM D1894: Static and Kinetic Coefficients of Friction test for Plastic Film and Sheeting
  • TAPPI T816: Coefficient of Static Friction test for Corrugated and Solid Fiberboard (Horizontal Plane Method)

COF Test Principle

Two sheets of same or different material is required to understand the coe-fficient of friction between them. One piece is clamped on the slider and the other is fixed on the sliding surface in such a way that both material slides on each other. The initial and dynamic forces required for the relative movement of samples are recorder and evaluated to calculate coefficient of friction. The test result is displayed after the completion of the test.

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Customer Reviews and Testimonials

 4.9 ( based on 16 ratings )

  • CustomerPosted on Jul 22, 2021
    I received my COF tester in a timely matter. The machine was well packaged. Great value for the price. I’d recommend this tester table to others.
  • CustomerPosted on Sep 11, 2023
    I can't express how impressed with this coefficient of friction tester! The test results is very accurate. It made the whole process much more simple in our product testing. Five stars all the way!
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What is Coefficient of Friction Tester ?

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The coefficient of friction (COF) tester is designed to measure the static and kinetic coefficients of friction of plastic film, sheeting and similar materials.

What is Coefficient of Friction?

Coefficient of friction, the ratio of the frictional force resisting the motion of two surfaces in contact to the normal force pressing the two surfaces together.

Coefficient of Friction Measurement

Coefficient of friction (COF) is a dimensionless number that is defined as the ratio between friction force and normal force. Materials with COF smaller than 0.1 are considered lubricous materials. COF depends on the nature of the materials and surface roughness.

The formula for the coefficient of friction is μ = Ff / FN, where μ is the coefficient, Ff is the friction force, and FN is the normal force.

Materials with COF smaller than 0.1 are considered lubricous materials. COF depends on the nature of the materials and surface roughness. Usually, ASTM D1894 is the most widely used method for COF measurement.

Static vs Kinetic Friction

Typically friction can be distinguished into static friction and kinetic friction. Static friction force Ffs is the friction force prior the initiation of motion. Kinetic friction (also known as dynamic, or sliding) force Ffk is the friction force developed during the motion. It should be noted that these forces are different with a following relation holding in most situations:

Ffk ≤ Ffs

Correspondingly, there are two friction coefficients, static μs and kinetic friction μk coefficients.

Static friction coefficient is calculated according to the following equation:

μs = Ffs / FN

Kinetic friction coefficient is calculated according to following equation:

μk = Ffk / FN