6-Hydroxy-2-naphthoic acid is white to light yellow powder (excellent product), light yellow to light brown powder or block (qualified product), melting point ≥245ºC, soluble in ethanol, ether, benzene, trichloromethan and alkaline solution, slightly soluble in hot water, almost insoluble in cold water.
This product can be used as an important organic intermediate of engineering plastics, organic pigments, liquid crystal materials, medicine, especially as a monomer of heat-resistant synthetic materials.