Phenol-formaldehyde resins are synthetic polymers created by the reaction of phenol and formaldehyde. These resins are known for their strong adhesive properties and durability, making them widely used in the production of wood products, such as plywood and particleboard. They are also utilized in various applications, including coatings, plastics, and insulation materials. The curing process of phenol-formaldehyde resins involves heat and pressure, which helps to form a rigid, thermosetting structure. This results in materials that are resistant to heat, chemicals, and moisture. Due to these properties, phenol-formaldehyde resins are essential in industries like construction and automotive manufacturing.