TAPPI T 459 OM 2013 provides a test method for measuring the surface strength of uncoated and coated papers using calibrated sealing waxes of increasing adhesive strength. The method identifies the highest wax number that does not disturb the paper surface, producing a critical wax strength number for comparing pick resistance.
The document covers scope, significance, definitions, apparatus, materials, safety precautions, calibration, sampling, test procedure, reporting requirements, precision data, keywords, and related methods. It is intended for paper, paperboard, printing, converting, coating, and quality control professionals who need a standardized procedure for assessing surface durability during production or performance evaluation.
Application Scope: Applicable to uncoated and coated papers where surface strength and resistance to picking are evaluated by the wax pick test; not suitable for loosely felted papers, papers containing heat-softening materials such as waxes or latex-type additives, or lightweight papers that may slip during wax removal.
