A paper's ability to resist tears, fading, and general aging over time. The national standard for permanence requires a pH of 7.5-8.5; at least 2% calcium carbonate; and no ground wood or unbleached fiber. The standard also has specific fold endurance and tear resistance requirements. Paper meeting the standard for permanence can be expected to last more than 100 years. Paper with a pH level of 5.5 or higher can be expected to last up to 50 years.

The ability of paper to retain, for a given period of time, its desirable properties such as color, and folding endurance. Prolonged exposure to light, humidity and extreme temperatures will adversely affect this ability.

The resistance to effects of time by internal or external factors.

The quality or state of being permanent; continuance in the same state or place; duration; fixedness; as, the permanence of institutions; the permanence of nature.

the property of being able to exist for an indefinite duration

In the digital world, permanence is a complicated term that requires not only the accurate refreshing of files, but the continued updating of metadata.

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