TAPPI T 573 SP 2009 describes a laboratory procedure for evaluating the physical strength stability of printing and writing papers after accelerated temperature aging. The document covers sample conditioning, dry oven exposure in airtight glass tubes, apparatus requirements, tube preparation, specimen handling, aging conditions, post-aging equilibration, and related strength testing considerations.
This 5-page PDF is intended for paper manufacturers, testing laboratories, quality control personnel, researchers, conservators, and technical users who need a standardized method for comparing how paper retains mechanical properties after controlled thermal aging.
Application Scope: Applies to cellulose-based printing and writing papers, including plain base paper, internally treated paper, coated paper, printed paper, and common variants used in normal printing and writing applications; it characterizes thermally induced aging effects and does not fully represent aging caused by light, pollutants, or other environmental factors.
