Cable industry has remained a much diversified field. It has the potential to provide a huge range of products starting from a very small power level to a very large power level. Electrical cables which are being manufactured are completely capable to sustain electrical charge according to its characteristics. Every major industry involving the use of electrical applications have become dependent on the cable industry.
Polyurethane (PUR) in cable industry
Polyurethane has become increasingly important in the cable industry over the past years. This material shows at certain temperatures mechanical characteristics similar to rubber. The combination of thermoplastic and elastic characteristics has led to the description thermoplastic elastomer.
The insulation materials of the cables are usually not subject to high mechanical stress. Sheaths, on the other hand are heavily used. This is especially true for flexible control and connection cables which are often pulled over sharp corners and rough surfaces. This can lead to cuts which are accentuated when the cable is stretched during flexible use. Compressive stress caused by squashing and impacting from tools and machines can also occur. The most important mechanical characteristics of PUR are:
- high tensile strength
- high tear resistance
- notch resistance
- abrasion resistance
The chemical resistance depends upon many factors such as chemical type, reaction time, temperature, volume, concentration and of course the type of Polyurethane used. In comparison with many other materials, such as rubber or PVC, PUR has a better resistance against chemical reaction. The outstanding chemical characteristics are:
- very good resistance against mineral oils
- good resistance against alcohol-free benzene
- good resistance during storage in water
- good resistance against many solvents
Exemplary applications of PUR cables
Polyurethane cables for control devices, e.g. machine tools, flow and assembly lines, conveyor systems and production lines, machine and plant construction, conveyor technology (e.g. work platforms and transport systems), automotive industry, handling and automation technology, iron, steel and chemical industry.