TAPPI T 578 SP 2011

A six-page TAPPI standard practice for accelerated light aging evaluation of printing and writing paper using a xenon-arc exposure apparatus.

TAPPI T 578 sp-11 provides a laboratory procedure for exposing printing and writing paper to controlled xenon-arc light at elevated irradiance to assess relative optical stability. The document covers scope, applicable TAPPI and ASTM standards, test chamber requirements, filtration, cooling, calibration, specimen conditioning, exposure procedures, optical measurements, calculation guidance, stability classifications, reporting requirements, and considerations for interpreting brightness loss, yellowness, post color number, and photoaging behavior. It is intended for paper manufacturers, laboratories, conservators, researchers, and other organizations evaluating the relative light stability and aging performance of paper products.

Application Scope: Use for controlled laboratory assessment and comparison of the photo-induced optical stability of printing and writing papers exposed to xenon-arc light.