Everything about Plastic Bonding Adhesives

Plastic bonding adhesives have multiple applications. Just look around you and you’ll find them in a bunch of things. From plastic containers, clamshell packages and medicine tablet strips to household appliances, mobile phones, laptops, plastic laminates, and industrial assembly productions, as well as automotive and aeronautical uses, plastic bonding adhesives are used practically everywhere. Often, plastic bonding adhesives provide a kind of bond that welding or regular adhesives are unable to render. Interestingly, each kind of plastic adhesive has a different use and it’s important to pick the right kind to ensure the bond lasts.

Choosing the best plastic bonding adhesives requires a tad bit of research. Adhesives can differ in their substrates, viscosity at room temperature and their elongation. A plastic bonding adhesive with viscosity of 150-200 at 25°C with substrates of polycarbonate and steel among others is ideal for plastic window bonding as well as in assembly productions of appliances (say, hair dryers, shavers, water filters etc). These adhesives will have a relatively lower tensile strength with an elongation variability of 55%.

Speaking of assembly productions, even the equipment for manufacturing utilizes ample bonding adhesives. Plastic housing assembly used for clipping, fitting, screwing and controlling time/date require a glue to hold them sturdy while performing these functions. Plastic bonding adhesives with viscosity of 450-550 at 25°C, which have substrates of PVC, Polyurethane, Steel and a few others will make the perfect choice for plastic housings to be used for safe manufacturing of multiple referenced batches. These kind of adhesives are also popular in plastic lamination and plastic window bonding. With an elongation of 68%, they are one of the best options where bonding and sealing is non-negotiable.

Then you have some plastic adhesives that have a very high viscosity of 5000-7500 at room temperature. They contain substrates of acrylic (PMMA) and glass (and others) but have the least elongation of only 45%. These bonding adhesives are useful for display assemblies particularly for laptop & mobile phone screens or aquariums. They are also useful in aerospace and automotive industries for their ability to be used in windshields, windows and other viewing panels.  They are also suitable for electrical potting.

Finally, plastic adhesives that have majority substrates of PET, recycled PET and amorphous PET along with paper have been widely used in packaging. Their viscosity at 25°C is a good 3000-4000, and they have an elongation of 92%. This makes them ideal for clam shell packaging (like those of take-away meals) as well as blister packaging used on strips of medicine tablets. The substrate materials give them excellent strength for bonding and sealing.

While there are many kinds of plastic bonding adhesives, make sure you choose UV ones. Only UV adhesives will cure instantly upon exposure to light. They may even cure right through UV-blocked plastics. It’s important to first identify what you want to use the adhesive for, what materials you want to bond together, and if you need the bond to elongate or not. Once you assess these factors and study all your options, you are bound to choose wisely.

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