Lignin fiber is derived from plant cellulose extracts such as wood and bamboo. It has a fluffy appearance, typically white or grayish white. It boasts a range of excellent properties: physically, it is insoluble in water, weak acids, and alkaline solutions, with a neutral pH value. It has a small density but a large surface area, offering superior thermal insulation, soundproofing, and breathability. It has even thermal expansion, is not prone to cracking, and possesses strong frost and heat resistance. Chemically stable, as a natural polymer material, it is non-toxic and biodegradable, and is resistant to corrosion from most solvents, acids, and bases. Mechanically, it has high strength, hardness, and stiffness, with tensile strength exceeding 4000 MPa. It also features good elasticity and wear resistance. Additionally, it has excellent flexibility and dispersibility, forming a three-dimensional network structure when mixed, and exhibits certain antibacterial properties, inhibiting the growth of bacteria, mold, and other microorganisms.

In the construction industry, lignin fiber has shone as an additive. Added to materials like concrete and gypsum boards, it significantly enhances strength and stability, effectively preventing cracks caused by plasticity and mechanical shrinkage. It also plays a crucial role in the production of soundproof and thermal insulation materials. In road construction, lignin fiber can boost the performance of asphalt mixtures, improving the road's resistance to rutting, fatigue, and water damage, thereby extending the lifespan of the road. In agriculture, it improves soil structure, enhances soil water and nutrient retention, promotes crop growth, and can also be used as a feed additive to improve animal digestion and absorption.

As research into lignin fiber deepens, its application scope is expected to expand further. Experts say that in the future, lignin fiber will continue to make strides in environmental protection and high-performance materials, injecting new momentum for green and efficient development across various industries.