Woodfree uncoated paper
Woodfree uncoated paper (WFU), uncoated woodfree paper (UWF) or uncoated fine papers are manufactured using wood that has been processed into a chemical pulp that removes the lignin from the wood fibers and may also contain 5–25% fillers. Both softwood and hardwood chemical pulps are used and a minor part of mechanical pulp might be added (often of aspen or poplar). These paper grades are calendered. Properties. Woodfree uncoated papers are of high quality and have a natural look and feel. The properties are good strength, high brightness and good archival characteristics. They provide a non-glare  surface suitable for reading and writing. Special types. "Offset paper" is a WFU paper with ISO brightness > 80% and a basis weight of 40–300 g/m. Surface strength and low linting are the main parameters, but brightness and opacity are also important. "Lightweight offset paper", also called onionskin, has a basis weight of 25–40 g/m and are normally used for bibles (hence the name Bible paper) and dictionaries.