Y6521 is a kind of rubber modified thermosetting phenolic resin produced by polycondensation of phenol and formaldehyde (paraformaldehyde) under alkaline catalysis. It is mainly used in textile styling agents, and the products are mainly used as positioning support for loudspeakers. Its characteristics are: This product is an alcohol-soluble phenolic resin, can dissolve in more than 70% concentration of alcohol, the cured product has both rigidity and toughness, good strength, large tension, has good stability and service life. Y6522 is a kind of high activity modified thermosetting phenolic resin obtained by polycondensation of phenol and formaldehyde (paraformaldehyde) under alkaline catalysis. It is mainly used in chemical fiber binder, and the product can be used as grinding material. Its characteristics are: can be dissolved in the right amount of water, can be infinitely dissolved in more than 70% concentration of alcohol, cured products, good rigidity, strength, and has good heat resistance, water resistance, wear resistance.