TAPPI T572 sp-21 PDF

This standard practice describes a laboratory procedure for the exposure of printing and writing paper to the common atmospheric pollutant gas nitrogen dioxide at elevated levels of concentration to permit accelerated aging of such paper.

This standard practice specifies the sample preparation and conditions of exposure required to obtain information on the relative stability of paper with regard to change in mechanical strength and optical properties brought about by exposure of such paper to common atmospheric pollutant gas.

This standard practice suggests qualitative analysis methods regarding paper stability and suggests the exact life expectancy for a given paper to reach a specified set of strength or optical properties. The limit(s) of acceptability and the test methods for a specified set of properties must be defined by each end user and will determine the life expectancy of the paper to be tested.