TAPPI T 628 CM 2010, Analysis of rosin size, is a 7-page PDF test method covering the analysis of rosin sizes ordinarily made by reacting rosin with an alkali. It includes procedures for paste size, dry size, and size emulsions, with guidance on sampling, sample preparation, moisture and volatile matter, free rosin, total rosin, combined rosin, unsaponifiable material, ash, alkalinity, free alkali, specific gravity, total solids, and total alkali.
The method includes apparatus and reagent requirements, calculation formulas, safety cautions for chemical handling, and notes on the use of extraction and titration approaches. It is classified as a Classical Method, preserving a technically sound procedure with a history of use for laboratories and quality control personnel working with rosin sizing materials in pulp, paper, and related chemical applications.
Application Scope: Applies to paste rosin size, dry rosin size, and rosin-size emulsions made by reacting rosin with an alkali; it does not apply to colloidally protected sizes or sizes containing added ingredients such as waxes or oils.
