The best polymer-based adhesives and sealants for bonding and sealing plastics, metals, and ceramics in automotive manufacturing include:1. Epoxy Resins: Epoxy resins are high-performance adhesives that provide excellent bonding strength and durability. They are suitable for bonding various materials, including plastics, metals, and ceramics. The properties that make epoxy resins well-suited for automotive applications include excellent adhesion, high mechanical strength, resistance to chemicals and moisture, and good thermal stability.2. Polyurethane Adhesives: Polyurethane adhesives are versatile and flexible, making them suitable for bonding different materials in automotive manufacturing. They offer excellent adhesion to plastics, metals, and ceramics, and provide good resistance to chemicals, moisture, and temperature variations. Their flexibility and elongation properties make them ideal for applications that require some degree of movement or stress.3. Cyanoacrylate Adhesives: Cyanoacrylates, also known as super glues, are fast-setting adhesives that provide strong bonding between various materials, including plastics, metals, and ceramics. They are well-suited for automotive applications due to their rapid curing time, high bond strength, and resistance to chemicals and moisture.4. Silicone Sealants: Silicone sealants are widely used in automotive manufacturing for sealing and bonding applications. They offer excellent adhesion to various materials, including plastics, metals, and ceramics, and provide good resistance to temperature fluctuations, chemicals, and moisture. Their flexibility and ability to withstand movement make them ideal for sealing joints and gaps in automotive assemblies.5. Acrylic Adhesives: Acrylic adhesives are suitable for bonding plastics, metals, and ceramics in automotive manufacturing. They offer good adhesion, high bond strength, and resistance to chemicals, moisture, and temperature variations. Some acrylic adhesives also provide excellent UV resistance, making them suitable for outdoor applications.The properties that make these polymers well-suited for automotive applications include:1. Excellent adhesion: These adhesives and sealants provide strong bonding between various materials, ensuring the durability and integrity of automotive components.2. High mechanical strength: They offer high bond strength and resistance to stress, making them suitable for applications that require robust and long-lasting bonds.3. Resistance to chemicals and moisture: Automotive adhesives and sealants must be able to withstand exposure to various chemicals, oils, and moisture. These polymers offer excellent resistance to such conditions.4. Thermal stability: Automotive components are often exposed to temperature fluctuations and high temperatures. These adhesives and sealants provide good thermal stability, ensuring their performance is not compromised under such conditions.5. Flexibility and elongation: Some automotive applications require adhesives and sealants that can accommodate movement or stress. Polymers like polyurethane and silicone offer flexibility and elongation properties, making them ideal for such applications.