Soft Pages Hard Cover Checked For Home Exercise Office File Folder With Plain Cover

Paper is made from wood pulp, the fiber of which is extracted, purified, and reconstituted into sheets. To make the paper more durable, and to add value, other materials are often added. This can include clay, calcium carbonate, chalk, and limestone. One of the most common additions is a chemical called alum. Alum is a chemical compound that is obtained from a number of sources, but most often comes from a type of rock called potassium aluminum sulfate. Alum adds a chemical strength to the paper and it is used in a variety of products. For a file folder, the alum may be used to help strengthen the folder and add a chemical coating to the paper. File folders are often used to organize papers in the office. They are often made of manila paper or other durable paper that can be folded or easily ripped. File folders are often used for things like schoolwork, work-related documents, or for use in a home office.