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File box printing paper

File box printing paper
File box printing paper

The acid content of the paper printed on the file box is a good indicator of its service life. It can be measured with a pH between 0 (acidic, which means the paper has a very short life) and 14.0 (alkaline, which means the paper has a long service life). As the paper used in the box printing increases with age and the number of exposures in daylight and air, the acidity of any type of paper increases. The pH of the acid value is below 7.0. For example, the newspaper you read every day is made of acid paper. If you can carefully save it, the newspaper will last for 20 years, but if you expose the newspaper to sunlight and air, then It may only be kept for a few weeks.

Acid-free means that the pH of the paper is 7.0 (neutral) or higher (alkaline). Under normal conditions of use and storage, the life of acid-free paper can reach 200 years.