Lignin fiber is an organic fiber primarily used in road paving as an indispensable stabilizer. It is usually fluffy, but sometimes, for example, in Stone Mastic Asphalt (SMA) road surfaces where it acts as a stabilizer, the lignin fiber is granular.

Lignin fiber is an organic fiber obtained through chemical processing of natural wood, appearing as cottony in texture and white or grayish white. It is processed through筛选, splitting, high-temperature treatment, bleaching, chemical treatment, neutralization, and sieving to different lengths and thicknesses to meet the needs of various application materials. Due to its processing temperature exceeding 250°C, it is chemically very stable under normal conditions, not corroded by general solvents, acids, or alkalis. It boasts excellent qualities of being non-toxic, tasteless, pollution-free, and non-radioactive, affecting neither the environment nor human health, and is a green and environmentally friendly product—a characteristic not found in other mineral fiber types. The microscopic structure of the fiber is banded and wavy, uneven, and porous, with flat intersections, offering good toughness, dispersibility, and chemical stability. It has strong water absorption capabilities and excellent thickening and crack resistance properties.