Solid phenolic resin is yellow, transparent and amorphous mass. It is red with free phenol. The weight of solid is about 1.7. It is easy to dissolve in alcohol and is insoluble in water. It is stable to water, weak acid and weak alkali solution. A resin made from phenol and formaldehyde under condensation, neutralization and water washing under catalyst conditions. Because of the difference in catalyst selection, it can be divided into two categories: thermosetting and thermoplasticity. Phenolic resin has good acid resistance, mechanical properties and heat-resistant properties. It is widely used in anti-corrosion engineering, adhesives, flame retardant materials, and grinding wheel manufacturing industry.

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