Sofia Martinez
Epoxies are strong adhesives that can be used on plastics and other materials. They can also work as fillers for gaps, holes, and cracks. The strength of epoxies varies, with some epoxies being strong enough to be used as an alternative to welding metal. The strongest epoxy glue commercially available is SystemThree's T-88, which has a tensile strength of 7000 psi. Other strong epoxies include PC Products' PC-7 Adhesive Paste and Loctite EA 109 High Temperature & Toughened. To use an epoxy, one must mix the resin and hardener and apply the desired amount to both surfaces, pressing and clamping them together until the epoxy sets.
| Characteristics | Values |
|---|---|
| Strongest epoxy glue | Systemthree's T-88 |
| Tensile strength of T-88 | 7000 psi |
| Other strong epoxies | PC Products' PC-7 Adhesive Paste, Loctite EA 109 High Temperature & Toughened, PlasticWeld, Loctite Plastic Bonder |
| PlasticWeld tensile strength | 700 PSI |
| PlasticWeld cure time | 2-3 hours |
| PlasticWeld cure colour | Off-white |
| PlasticWeld compatibility | Does not adhere to polyethylene, polypropylene or some other plastics |
| Loctite Plastic Bonder compatibility | ABS plastic, PVC, acrylic, polycarbonate, FRP, and most other plastics |
| Loctite Plastic Bonder features | High impact resistance, water resistance, no shrinking or cracking |
| Loctite Plastic Bonder cure time | 25 minutes |
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What You'll Learn
SystemThree's T-88 is the strongest epoxy glue
Epoxies are strong adhesives that can work as fillers and are suitable for use on gaps, holes, and cracks. They can be used on a variety of materials, including metal, and can even provide an alternative to welding.
T-88 has a long working time, with a gel time of up to 60 minutes, and is easy to mix and work with. It is also waterproof and solvent-free. The adhesive can be used without modifications in normally fitted joints and will cure without shrinkage. T-88 is clear amber and becomes virtually invisible when varnished.
SystemThree's T-88 is a versatile and powerful epoxy glue that can be used for a wide range of applications, including woodworking, marine applications, and repairs. It is a popular choice for professionals and hobbyists alike due to its superior strength and performance.
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Epoxy can work as filler and adhesive
Epoxy is a strong plastic adhesive that can be used to fill and repair gaps, holes, and cracks in a variety of materials, including metal, wood, and plastic. When used on metal, epoxy can even provide an alternative to welding, demonstrating its impressive strength. For example, DELO Adhesives used 3 grams of epoxy glue to lift a 17.5-ton truck with a crane, setting a world record.
Epoxy fillers are used to thicken the basic epoxy resin/hardener mixture, allowing for specific applications and greater control over the consistency of the epoxy. Adhesive fillers, for instance, are high-density fillers used for bonding applications, particularly with high-density materials like hardwoods and metals. They create a strong, hard-to-sand cured epoxy plastic that is ideal for structural bonding applications.
When using epoxy as a filler, it is important to select the appropriate filler type for your project. Common epoxy fillers include colloidal silica, microballoons, milled glass fibre, and wood flour. Wood flour, for instance, is ideal for wooden projects as it absorbs the epoxy to create a stiff, strong putty that has a natural wood colour. For bonding hardwoods and metals, or filling large gaps, a high-density filler like colloidal silica is recommended for maximum-strength bonds.
To use epoxy as a filler, first mix the desired amount of resin and hardener on a disposable surface, following the manufacturer's instructions. Then, gently stir in the chosen filler type, being careful to avoid making the particles airborne. The mixture should be thoroughly combined and have a consistency similar to mayonnaise or ketchup, depending on the application. Once the epoxy filler is ready, apply it to the desired surface, following standard epoxy application procedures.
Epoxy is also an effective adhesive, capable of holding moving parts and load-supporting parts. Systemthree's T-88, a two-part adhesive, is known for its exceptional strength, with a tensile strength of 7000 psi, which is well above the average for epoxies. When selecting an epoxy adhesive, it is important to consider the specific materials being bonded and choose an epoxy that is suitable for those surfaces. Additionally, always follow the manufacturer's instructions for the best results.
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PlasticWeld is a hand-mixable, fast-setting epoxy putty
PlasticWeld has a work life of 20-25 minutes and a functional cure time of 2-4 hours. It cures to an off-white colour and has a lap shear strength of 600-700 PSI. It can withstand continuous temperatures of up to 250°F (121°C) and intermittent temperatures of up to 300°F (148-149°C).
PlasticWeld is easy to mix and apply, and it provides strong adhesion. It can be used to repair almost any plastic item, including classic car parts. It can also be moulded, shaped, sanded, drilled, cut, sawed, carved, and painted.
It is important to note that PlasticWeld does not adhere to polyethylene, polypropylene, or some other plastics. Therefore, it is recommended to test for adhesion first before applying it to the desired surface.
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Loctite Plastic Bonder is best for ABS plastic, PVC, acrylic, etc
Epoxy is a strong adhesive that can work as a filler and is suitable for use on gaps, holes, and cracks. When used on metal, it can even provide an alternative to welding. Epoxies can hold moving parts and load-supporting parts. For example, in 2019, DELO Adhesives lifted a 17.5-ton truck with a crane using just 3 grams of glue.
Loctite Plastic Bonder is one of the best epoxies for bonding and repairing plastic surfaces, including ABS plastic, PVC, acrylic, polycarbonate, FRP, and most other plastics on the market. It is ideal for larger household repairs and can bond materials such as nylon, Mylar, Delrin, phenolic, aluminum, and stainless steel. The formula produces a tough, rigid, high-strength bond in just 20 to 25 minutes. It does not shrink and is resistant to water, most common solvents, and shop fluids. It also has high impact resistance and can be sanded and drilled.
Loctite also offers other epoxies for specific use cases, such as Loctite Metal and Concrete Epoxy for repairing holes, pop-outs, and larger cracks, and Loctite Super Glue for repairing plastic toys.
While Loctite Plastic Bonder is a strong epoxy, the strongest commercially available epoxy is Systemthree's T-88, which has a tensile strength of 7000 psi.
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Epoxy alone may not be enough to bond plastic to metal
Epoxy is a strong adhesive that can work as a filler as well as a glue. It is suitable for use on materials such as metal and plastic, and can even fill gaps, holes, and cracks. However, epoxy alone may not be enough to bond plastic to metal.
When bonding plastic to metal, the type of plastic is an important consideration. Some plastics can be glued, while others cannot. For example, hard plastics like acrylic, ABS, polystyrene, and vinyl/PVC can generally be glued, whereas flexible "waxy" polyethylene and polypropylene such as HDPE, PETE, most buckets, cups, and bottles cannot.
Additionally, surface preparation is critical for a successful bond. Both the metal and plastic surfaces should be sanded or scuffed to create a rough surface for the epoxy to grip onto. Proper mixing of the epoxy components and allowing adequate cure time are also essential. Inadequacies in any of these steps can result in a weak bond that may break prematurely.
Furthermore, the specific application and environmental conditions should be taken into account. For instance, if the bonded item will be subjected to heat, hot water, or forces and stresses, the epoxy may not be sufficient on its own. In such cases, additional mechanical fasteners, such as screws, washers, and nuts, might be necessary to reinforce the bond.
Finally, while epoxy is a versatile adhesive, there are alternative glues and cements that may be better suited for specific applications. For instance, contact cement can be effective for flat surfaces, and polyurethane glue works well for bonding 3D printed PET plastic to other materials. If epoxy alone is not sufficient, exploring these alternative adhesives or combining them with mechanical fasteners could provide a stronger and more durable bond.
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Frequently asked questions
A strong plastic epoxy is an adhesive that can be used to bond plastic to other surfaces, including metal. It can also be used as a filler for gaps, holes, and cracks.
SystemThree's T-88 is believed to be the strongest plastic epoxy available on the market. It has a tensile strength of 7000 psi, which is well above the average for epoxies.
Using a plastic epoxy usually involves mixing a resin and a hardener on a disposable surface, applying the mixture to the desired surfaces, and then clamping the pieces together until the epoxy sets.
Some strong plastic epoxies include Loctite Plastic Bonder, PlasticWeld, PC Products' PC-7 Adhesive Paste, and Loctite EA 109 High Temperature & Toughened.
