TAPPI/ANSI T 428 om-13 describes a standardized laboratory procedure for measuring the titratable acidity or alkalinity of an aqueous paper extract after boiling water extraction. The method covers specimen preparation, apparatus, reagents, extraction, pH-meter titration, calculations, reporting, and precision information for evaluating how water-soluble paper constituents affect acidity or alkalinity.
This concise PDF is intended for paper laboratories, quality control teams, researchers, and technical personnel who need a recognized TAPPI method for routine acceptance testing, comparative evaluation, or classification of paper materials.
Application Scope: Applicable to writing, printing, and sized industrial paper; not intended for testing electrical insulating papers.
