syrefrie

Syrefrie is a Norwegian term that translates to acid-free in English. It is used to describe materials and products designed to resist the damaging effects of acidity over time. In archival, library, and art contexts, syrefrie materials are preferred because acids from wood fibers, inks, adhesives, or coatings can cause paper and other substrates to become brittle, yellow, or to deteriorate. A syrefrie item is typically pH-neutral (around 7) or alkaline buffered with substances such as calcium carbonate to slow acid migration. The term is commonly applied to papers, films, storage boxes, and mounting materials intended for long-term preservation.

Standards and characteristics: High-quality syrefrie paper for archiving is usually lignin-free and has low impurity content. Many syrefrie products are produced to meet archival permanence standards such as ISO 9706, which specify requirements for long-term durability and resistance to aging. In practice, "acid-free" labeling can be used more loosely in consumer markets; labels may indicate pH-neutral or buffered, and the degree of buffering, lignin content, and transparency vary by product.

Applications and limitations: Syrefrie materials are used in libraries, archives, museums, photographers, and hobbyists who handle documents, photographs, art prints, and memorabilia. Even with syrefrie labeling, long-term preservation depends on storage conditions, including temperature, humidity, and light exposure, as well as compatibility with other materials (for instance, acidic tapes or glues can cause acid migration). Regular assessment and proper handling are recommended to maximize longevity.