As a materials science expert with a focus on adhesives, I can provide an in-depth explanation of what glues plastic together. Plastics are a diverse group of materials that can be bonded using various types of adhesives, each with its own set of properties and applications. The choice of adhesive depends on the type of plastic, the application's requirements, and the desired bond strength.

Super Glues, also known as cyanoacrylate adhesives, are one of the most common types of glues used to bond plastics. They cure rapidly at room temperature and provide strong, immediate bonding. The Loctite All-Plastic Super Glue, as mentioned, includes a tube of bonding agent and a surface activator. The bonding agent is the actual adhesive that forms a bond with the plastic, while the surface activator is used to prepare the plastic surface for better adhesion. The surface activator works by removing any contaminants or oils that might prevent the adhesive from forming a strong bond.

Super glues work well with a variety of plastics, including polyethylene and polypropylene, which are common materials used in many household and industrial products. These adhesives are known for their ability to bond with both hard and soft plastics, making them versatile for a wide range of applications.

However, not all plastics are compatible with super glues. Some plastics, particularly those with low surface energy, may require a different type of adhesive or a special primer to achieve a strong bond. For example, polyvinyl chloride (PVC) and polytetrafluoroethylene (PTFE), commonly known as Teflon, are less receptive to super glues and may require alternative bonding methods.

Another type of adhesive that is often used for plastics is epoxy resin. Epoxy adhesives are two-part systems that consist of a resin and a hardener. When mixed, they cure to form a very strong bond. Epoxies are versatile and can be used with a wide range of substrates, including different types of plastics. They offer excellent adhesion, chemical resistance, and can be formulated to cure at different temperatures and speeds.

Plastic cement or solvent cements are also used for bonding certain types of plastics, especially those that are not compatible with super glues. These cements work by partially dissolving the plastic, allowing the two surfaces to fuse together. This type of bonding is commonly used in model kits and other applications where a strong, permanent bond is required.

In addition to these adhesives, there are also pressure-sensitive adhesives (PSAs), which are used for applications where a temporary or repositionable bond is needed. PSAs are often found in tapes and labels and can be used with certain types of plastics.

When choosing an adhesive for plastic, it is important to consider the specific properties of the plastic, the required bond strength, the environmental conditions the bond will be exposed to, and the curing time. Some adhesives may require a specific surface preparation, such as cleaning with a solvent or applying a primer, to ensure the best results.

In conclusion, the choice of adhesive for bonding plastics is vast and depends on the specific needs of the application. Super glues, epoxy resins, plastic cements, and PSAs are all viable options, each with their own advantages and considerations. Proper surface preparation and understanding of the adhesive's properties are key to achieving a successful bond.

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The Loctite All-Plastic Super Glue includes a tube of bonding agent and a bottle of surface activator. It bonds with hard and soft plastic. The glue works well with polyethylene and polypropylene surfaces.read more >>