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Solid phenolic resin is yellow, transparent, amorphous mass substance, because it contains free phenol and reddish, the average specific gravity of the entity is about 1.7, soluble in alcohol, insoluble in water, stable to water, weak acid, weak alkali solution. Resin made of phenol and formaldehyde polycondensation, neutralization and water washing under catalyst conditions. Due to the different catalysts selected, it can be divided into two categories: thermosetting and thermoplastic. Phenolic resin has good acid resistance, mechanical properties and heat resistance, and is widely used in anti-corrosion engineering, adhesives, flame retardant materials, grinding wheel manufacturing and other industries.

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