Cof iso

Coefficient of Friction Testing of Plastics The coefficient of friction , or COF, is determined by the ease with which two surfaces slide against each other. The test apparatus is rotated and the torque required is measured.

Advertise with MatWeb! Data sheets for over , metals, plastics, ceramics, and composites. Follow MatWeb. Please read our License Agreement regarding materials data and our Privacy Policy. Questions or comments about MatWeb? Please contact us at webmaster matweb. We appreciate your input. Although less common, issues can also arise if CoF is too low on a wrap product is too slippery. In certain packaging lines, wrapped items are moved from one stage to another using wheels or belts and a wrap with too low of a CoF might be difficult to grab or move.

Increasing the CoF would allow such wheels or belts to better grip the product. Another symptom of too much slip in a wrap is slight build up on packaging lines of wax or silicon over time- if you are noticing such build up, you may need to lower your CoF spec. There are a variety of methods for measuring CoF and a variety of machines designed to do so. A below which uses a calibrated load cell to determine both static and kinetic readings for our products. Our procedure is to lay a long strip of the material on our device, then use the machine to drag a smaller square of that same material across the strip while the machine gathers data.

As the sample slides along the long strip, the machine calculates its Static and Kinetic CoF measurements — a video of this process is featured below:. The angle of that breaking point is then used to calculate CoF. When it comes to selecting the right range for CoF on your foil packaging, we have found that at the end of the day the best determinant of selecting an appropriate CoF is wrap speed.

The faster your machine, the lower the CoF spec should be. For example, an engineering consultant will perceive the consequences of failure associated with deferment of the washing of the exterior windows as negligible while an owner who occupies one of the suites may consider this to be higher.

The failure of a roof membrane that leaks into the building and causes significant disruption to the space users Operations and damage to interior finishes The quantitative and qualitative expression of possible loss that considers both the probability that an event will occur and the consequence of that event. A canopy that is loose and could fall onto people entering the building and injuring someone safety , perhaps fatally would be classed as "Catastrophic Tier 1.

Methodology Listed below are some of the key steps in the assignment of CoF rankings to events: Identify the asset eg. Identify the failure modes eg. Management Principles CoF is most essential for critical assets and bounded assets. Risk-based decision making is at the heart of asset management and this requires mindful consideration of the relationship between the probability of failure PoF and the consequences of failure CoF.

The complexities of these correlations can sometimes be captured on a risk matrix. Consequences of Failure CoF represented on the vertical y-axis of a criticality matrix risk matrix.

Care is oblivious to the extraordinary events that can totally wipe out his assets and upset the delicate order of things, such as force majeure and acts of God. Photograph array of some of the physical consequences of failure. Risk matrix with tiered separation of the consequences of failure CoF.