Reactive adhesives are adhesives that cure by undergoing a chemical reaction, typically between two or more components. This reaction results in the formation of a strong, permanent bond between the adhesive and the substrates being bonded. Reactive adhesives are often used in high-performance applications where strong adhesion and durability are required, such as in the aerospace, automotive, and construction industries.

Here are some common types of reactive adhesives:

1. Epoxy adhesives: These adhesives are based on epoxy resins, which are typically cured using a curing agent such as an amine. Epoxy adhesives offer high strength and good toughness, and they are resistant to chemicals and solvents.

2. Acrylic adhesives: These adhesives are based on acrylic resins, which are typically cured by exposure to ultraviolet light or heat. Acrylic adhesives offer fast curing speeds and good adhesion to a variety of substrates.

3. Urethane adhesives: These adhesives are based on urethane resins, which are typically cured by exposure to moisture. Urethane adhesives offer high strength and flexibility, and they are resistant to water and other environmental factors.

4. Cyanoacrylate adhesives: These adhesives are also known as instant adhesives because they cure very quickly, often in seconds. Cyanoacrylate adhesives are based on cyanoacrylate resins, which are activated by moisture.

5. Anaerobic adhesives: These adhesives cure when deprived of oxygen, making them well-suited for applications where it is difficult to exclude air, such as in the bonding of metal parts. Anaerobic adhesives are based on acrylic or methacrylate resins.

Reactive adhesives can provide strong and durable bonds between a wide variety of substrates, including metals, plastics, composites, and wood. They are often used in demanding applications where high performance and reliability are essential.