Omar Khalid
Gluing hard plastic together can be challenging, but it's not impossible. Different types of plastics require different types of plastic glue, and the success of the adhesion depends on the porosity and molecular shape of the plastic. Plastic is not porous and is made of long molecules, which means there aren't many ends for the glue to connect to. However, there are various methods and types of glue that can be used to successfully glue hard plastics together.
| Characteristics | Values |
|---|---|
| Types of glue | Super glue, epoxy, Gorilla Glue, cyanoacrylate, PUR hot melt, solvent cement, model airplane glue, Polyurethane, PolyTAC 500, Scotch-Weld DP8005, Infinity Bond Rubber |
| Plastic types | Polyethylene, Polypropylene, Polystyrene, Polycarbonate, Acrylic, ABS, PVC, CPVC |
| Steps | Line up the edges, apply pressure, use tape or a weight to hold it in place, let it cure, use a soldering iron to melt the edges |
| Other methods | Plastic welding, drilling and bolting, using spacers, bondo |
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What You'll Learn
Soldering iron to melt the edges of the plastic
Soldering is a method of joining two pieces of plastic by melting another material that sticks to both pieces without melting the two pieces being joined. While it is possible to use a soldering iron to melt plastic and use it like a plastic welder, it is not recommended as it will look horrible and not work well.
If you choose to use a soldering iron to melt the edges of the plastic, you need to know the type of plastic and its melting point. If you heat it up too much, you will burn the plastic and significantly weaken it. Welding it properly will create a joint that is almost as strong as the original plastic. Reinforce the joint by knowing the direction of stress to decide how best to reinforce it. Reinforcing it usually means embedding stiff metal across the break. Thin metal straps are great for this. Apply heat to the metal and push down into the material.
Alternatively, if the plastic you are working with is ABS, you can use acetone to perform a chemical weld. You will need to add new ABS to fill any gaps. If you choose to glue, the glue you use depends on the plastic used. For a rigid bond, epoxy is recommended. For a flexible bond, E6000 is a good choice.
Another method of joining plastic is by using plastic welding, where you melt the plastics back together. This can be done using a plastic zip tie as the melting agent.
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Using epoxy glue
Epoxy glue is a great choice for bonding plastics as it creates a strong adhesive bond. It is especially useful for filling in gaps and carrying out high-strength, permanent exterior repairs. For instance, Loctite Extreme Epoxy is a strong adhesive that is compatible with most hard plastics.
Before applying the epoxy glue, it is important to sand the surface to be glued. Briefly sand the plastic with 120-200 grit sandpaper to create a rough surface for the glue to bond to. You can also use steel wool or emery cloth, but remember to only rub it briefly.
If you are using a two-part epoxy, carefully read the instructions on the container as you will need to mix the two glue components together in the correct ratio. Some two-part epoxies can be used for several hours after mixing, while others require application within a few minutes.
Apply an even layer of epoxy glue to both surfaces using a small brush. Press the pieces together lightly, ensuring that there are no air bubbles. Be careful not to push too hard, as this may cause the adhesive to ooze out of the joint.
Use clamps, tape, or rubber bands to hold the pieces firmly in place while the glue dries. Depending on the type and brand of adhesive, the bond could take a few minutes to 24 hours to develop. Avoid applying stress and heat to the glued piece for at least 24 hours, even if it seems strong.
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Using double-sided sticky tape
Double-sided sticky tape can be used to stick hard plastic together. It is important to ensure that the tape is suitable for the specific type of plastic and the conditions it will be exposed to, as certain tapes are designed for specific temperature ranges and surfaces.
To achieve optimal adhesion, the surface of the plastic must be clean, dry, and oil-free. Rubbing alcohol can be used to clean the surface, but it is important to test it on a small, hidden area first as it may cause discolouration. The surface should then be dried thoroughly with a soft cloth. If the plastic surface is rough, a thick adhesive tape will be required to ensure good contact.
Some recommended double-sided tapes for hard plastics include 3M exterior emblem tape, 3M VHB Waterproof Foam Tape, and Loctite Power Grab Double-Sided Exterior Tape. These tapes can be found at hardware stores or online.
When applying the tape, ensure that the temperature is suitable, as extreme temperatures can affect adhesion. It is also important to ensure that your hands are clean and dry to prevent grease or dirt from disrupting the adhesive bond.
Double-sided sticky tape can provide a strong and durable bond between hard plastic surfaces when used correctly, making it a convenient and effective solution for many applications.
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Gluing with model airplane glue
Choosing the Right Glue
Not all glues are created equal, and different types of model airplane glue are available for specific applications. For example, Yellow Carpenter's Glue (PVA glue) is tackier than white glue and is useful for gluing balsa airframes. Canopy glue is another option that bonds well with non-porous materials like plastic and remains flexible when dry. Goop, a household glue, can also be used but be cautious as it will dissolve some foams. If you are gluing large, flat surfaces, a standard cement like Revell might be a good choice, while extra-thin cement might be better for smaller pieces.
Surface Preparation
Before applying the glue, ensure that the plastic surfaces are clean and free of debris. Use a mild soap or solvent to clean the surfaces and allow them to dry completely. If necessary, lightly sand the surfaces to create some texture, which will help the glue adhere better.
Glue Application
Apply a thin layer of model airplane glue to both surfaces that you want to join. Be careful to avoid applying too much pressure, as you don't want the glue to ooze out from between the joints. Use clamps, rubber bands, or tape to hold the pieces together securely while the glue dries.
Curing and Bonding
Model airplane glue typically cures quickly, so you won't have to wait long for it to dry. However, avoid handling the glued pieces for at least 24 hours to ensure the bond is strong. The glue will continue to strengthen over the next 24-48 hours until it is fully cured. If you need to speed up the curing process, you can use a CA accelerator or "kicker", but be cautious as this can result in brittle joints.
Safety Precautions
Always follow safety precautions when working with model airplane glue. Work in a well-ventilated area, as some glues release dangerous vapors. Additionally, be careful not to get the glue on your skin, especially the CA glue, as it can cause blisters if it comes into contact with your skin.
By following these steps and tips, you can effectively use model airplane glue to stick hard plastic together, creating a strong and durable bond.
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Using a plastic welding technique
Plastic welding is a relatively simple task to perform at home, as plastic is soft and pliable. It is a good method for repairing cracks or joining pieces of plastic together.
Firstly, you need to identify the plastic type. Most plastics have letter identifiers printed on them, such as PE (polyethylene), PP (polypropylene), or PVC (polyvinyl chloride). You can use a welding rod test kit to identify the plastic type if you are unsure.
Next, you need to prepare the plastic. If the plastic has paint on it, you must remove it with 80-grit sandpaper or an abrasive disc/sanding wheel attachment. Be careful not to scratch the plastic. Clean the plastic with a liquid solvent like methyl ethyl ketone (MEK) to remove any stains.
Now, you can begin the welding process. Set up your workspace in a well-ventilated area or outdoors to protect against dust and fumes. Wear a dust mask and protective eyewear for safety. Clamp and tape the plastic pieces together to hold the joints in place, forming the desired joint. Wrap foil tape around the pieces to keep them pressed together, but avoid covering the welding area. Preheat your welding gun for at least 2 minutes, setting the temperature according to the plastic type. The temperature range is typically between 200°C and 300°C (390°F to 570°F).
Once the welding gun is preheated, use it to gradually melt and join the plastic pieces together. Finish the weld by smoothing it out to create a strong and cost-effective fix.
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Frequently asked questions
Different types of plastics require different types of plastic glue. For gluing PVC, use a two-part primer and PVC solvent cement. For bonding polystyrene, use a poly cement, epoxy, or cyanoacrylate. For polycarbonate, an epoxy will work best. For acrylic, an acrylic solvent adhesive or cyanoacrylate may work. For ABS plastics, use an epoxy for optimal results. Other options for gluing hard plastics include SuperTAC 500, Scotch-Weld DP8005, and Infinity Bond Rubber and Plastic Super Glue Cyanoacrylate.
Plastic welding involves melting plastics back together. This method creates a more durable connection than glue.
First, line up the edges of the plastic pieces carefully. Plastic glues dry quickly, so you may only get one shot. Apply a powerful plastic adhesive to the separated surfaces and use just enough glue to hold the pieces together. Press the pieces lightly together, removing any air bubbles. Use a clamp, vise, masking tape, or rubber bands to hold them firmly together. Refer to the adhesive container for instructions on how long to leave the pieces in place. Avoid applying stress and heat to the glued piece for at least 24 hours after application.
Soldering irons can be used to melt the edges of the plastic, creating a durable connection.
In addition to glue and soldering, you can use bolts to join plastic pieces. Drilling through and using long thin bolts can help secure the plastic pieces.
