Surface strength is a resistance against peeling, an important property for printing paper in general and for offset printing paper in particular. A number of testing methods are available for measuring the surface strength of paper, including a method using wax and a printing-based method using a wide range of printability testers. The method using wax is widely employed since it provides simple measurement of the property. However, it cannot be used for testing coated paper in which thermoplastic binder is used. The wax products come in bars with numbering stamped from 2A to 26A, with higher viscosity provided for greater numbers. 2A to 20A wax bars are commonly used.
|Kinds||2A, 3A, 4A, 5A, 6A, 7A, 8A, 9A, 10A, 11A, 12A, 13A, 14A, 16A, 18A, 20A, 23A, 26A|
|Referential standards||J TAPPI 1-2000, TAPPI T459om-03|
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