The advantages of phenolic resin cotton sheet
Phenolic resin cotton sheet consists of several weights of cotton fabric that ranges from less than four ounces per square yard to 6, 8, 10 and 25 ounces per square yard. When used for gear and bearing-type applications, the phenolic resin cotton sheet is easy to machine and operate with relatively less noise than metal. It does not produce a spark even when struck which means it can be used in an explosive-proof environment. When the material is used for structural and electrical insulation it is less abrasive than fiberglass. A phenolic canvas composite can also be used to create a variety of parts that include gears, pulley, rollers and guide. When bleached linen is used in the product, it enhances moisture resistance, electric insulation and other desirable properties. If the phenolic resin cotton sheet will be used for various applications, it can be modified or lubricants can be added to reduce wear. The weight of canvas and the resin formulations can be changed in order to modify the properties of the composite laminate.
Phenolic cotton grades used for industrial laminates
- NEMA Grades C and CE canvas cotton cloth reinforced phenolic – its most typical color is light tan to brown. These grades usually consist of continuous cotton woven cloth that is impregnated with a phenolic resin binder. Generally speaking, these types of phenolic are not equivalent to epoxies in terms of resistance to moisture, humidity, dimensional stability, shrinkage and retention of electrical properties in extreme conditions but it is quite adequate a fair percentage of electrical applications. These grades are more known for its mechanical properties.
- NEMA Grades L and LE linen cloth reinforced phenolic – its natural color is also light tan to brown. These grades are made from a continuous fine weave linen cotton cloth that is impregnated with a phenolic resin binder. Similar to Grades C and CE, these grades are more significantly known for their mechanical properties but the finer weave allows for more intricate machining than the canvas grade. These grades are not also suggested for primary electrical insulations but Grade LE has superior moisture resistance compared to Grades L, C and CE. It can also be an adequate insulator for a good number of applications.
- NEMA Grades X, XX and XXX paper reinforced phenolic – these grades are composed of a paper base instead of a cloth base and it among those that are easiest to process and lowest in cost. These paper-based phenolics have fair mechanical strength but good electric strength properties. It should be noted that the more X’s mean more superior electrical properties while less X’s mean more mechanical properties.