Permanent paper is a type of paper that is designed to last for a long time without yellowing or becoming brittle. It is often used for important documents, such as birth certificates and legal documents, that need to be preserved.
The paper is made with a high percentage of cotton or linen fibers, which makes it more durable than standard paper made with wood pulp. Permanent paper is also acid-free, which helps to prevent it from yellowing over time.
There are a few different standards that permanent paper must meet in order to be considered truly “permanent.” One is that the paper must have a pH level of 7.5 or higher. This means that it is neutral or slightly alkaline, which helps to prevent it from breaking down.
The paper must also be lignin-free, which means that it does not contain any of the natural compounds that make paper degrade over time. Finally, the paper must be buffered, meaning that it has been treated to resist changes in pH level.
Permanent paper is usually made from wood pulp that has been treated to resist degradation. The paper may also be coated with a material that further protects it from damage, such as calcium carbonate.
Permanent paper is not as common as it once was due to the development of more durable synthetic materials, such as polyester. However, it remains the material of choice for many important documents that need to be preserved for posterity.
Permanent paper is extremely important to the printing and book industry because it ensures that books and other printed materials will last for a very long time. This type of paper is made with chemicals that make it resistant to degradation from light, heat, and moisture, which means that it won’t yellow or fall apart over time. This is essential for books, which are often passed down through generations or kept on shelves for many years. It’s also important for prints and other documents that need to be preserved.