HQ8840 is a composite modified thermosetting phenolic resin, mainly used in industrial fabrics. Its characteristics are: resin infiltration, bonding strength and high heat resistance; good compatibility, can be fully mixed with other organic and inorganic additives, dipping process is easy. The low content of free resorcinol can avoid the problems that the resorcinol will affect the operating environment, the operator's health, and the “spraying” phenomenon on the surface of the rubber compound due to high temperature sublimation during the mixing process. Resorcinol-formaldehyde resins and methylene donors vulcanize faster at vulcanization temperatures, reduce the elongation stress of vulcanizates, increase tensile strength and adhesion, and provide excellent adhesion properties, allowing The adhesive strength of fibers and steel wires is greatly improved, and the durability of finished tires can be improved. R-50D is a high-activity resorcinol-phenol-formaldehyde resin that combines the advantages of phenolic and resorcinol-formaldehyde resins. Compared to phenolic resins, the resin has a lower curing temperature and a shorter curing time. At the same time, it has excellent water and weather resistance and high bonding strength. The low content of free resorcinol can avoid problems such as the operating environment, the operator's health, and the "spraying" phenomenon of resorcinol on the surface of the rubber compound due to high temperature sublimation during the mixing process. .