Maya Ellison
Threadlockers are used to prevent screws from vibrating loose. While threadlockers work on metal, they do not work on plastic. In fact, some threadlockers like Loctite will destroy plastic, causing it to become brittle and disintegrate. Loctite 425 Assure is a threadlocker that can be used on both plastic and metal. Other alternatives to threadlockers for plastic include Krazy Glue, GE silicone caulk, and rubber washers.
| Characteristics | Values |
|---|---|
| Loctite on plastic | Not recommended; will cause plastic to become brittle and disintegrate |
| Loctite on metal | Recommended |
| Alternative for plastic | GE silicone caulk, Gorilla glue, Krazy Glue, rubber washers, Tamiya Thread Locker, Loctite 425 |
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What You'll Learn
Loctite 425 is a threadlocker for plastic and metal
Loctite 425 is a threadlocker that can be used on plastic and metal. It is a fast-curing, low-strength, cyanoacrylate-based adhesive that is designed for locking small metal and plastic fasteners. It cures in less than 2 minutes on plated metal and plastic fasteners and has full strength in 24 hours.
Loctite 425 is suitable for plastic-to-plastic or plastic-to-metal applications. It is important to note that not all Loctite products are suitable for use on plastic. Some Loctite threadlockers, such as Loctite Blue 242, can cause plastic to become brittle and disintegrate. Therefore, it is essential to choose a product specifically designed for use on plastic, such as Loctite 425.
Loctite 425 is intended for industrial use only and is not meant for consumer sale or application. It is available in a 20-gram bottle and can be purchased from various suppliers, including Henkel Adhesives, Ellsworth Adhesives, and Amazon.
When using Loctite 425, it is important to ensure that the bonding surfaces are clean and free from grease for optimal performance. The adhesive performs best in thin bond gaps of approximately 0.05 mm. Any excess adhesive can be dissolved using Loctite cleaning solvents, nitromethane, or acetone.
Loctite 425 is a reliable choice for securing small metal and plastic fasteners, offering a quick cure time and low strength. It is important to follow the instructions and take the necessary precautions when using this industrial-grade adhesive.
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Loctite will make plastic brittle and cause cracking
Loctite is a threadlocker that can be used to lock metal nuts and bolts. However, it is not suitable for use on plastic, as it will make the plastic brittle and cause cracking.
Loctite contains chemicals that can react badly with most plastics, causing them to become brittle and crack, or even disintegrate completely. This is known as chemical stress cracking, where chemical agents come into contact with areas of tensile stress, resulting in the plastic breaking over time due to the combined effect of the chemical agent and stress.
Several users have reported incidents where Loctite has damaged plastic parts. For example, one user applied Loctite to a hard plastic item mounted to a metal bracket, and the plastic became brittle and disintegrated within minutes. Another user applied Loctite to the nylon nuts and bolts of their quadcopter, only to find that it had eaten away at the nylon, causing the nuts to split easily.
Loctite's website acknowledges that their product can react with plastic and recommends wiping off any excess immediately. They also suggest using an accelerator to flash cure the Loctite if it comes into contact with plastic.
To avoid damaging plastic parts, it is recommended to use alternative products such as Vibra-Tite, GE silicone caulk, or Tamiya Thread Locker. These products can provide similar thread-locking functionality without the risk of damaging plastic components.
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Krazy Glue is a plastic-safe threadlocker
Threadlockers are used to prevent screws from vibrating loose or backing out. While Loctite is a popular threadlocker, it is not suitable for use on plastic as it can cause the material to become brittle and disintegrate.
Some Loctite products, such as Loctite 425, are specifically designed for use on plastics and metals. However, as a general rule, Loctite should not be used on plastic. So, what are the alternatives?
In addition to Krazy Glue, there are several other plastic-safe adhesives that can be used as threadlockers. These include silicone gasket sealer, GE silicone caulk, white or yellow wood glue, Gorilla glue, and hot glue. For plastic-to-plastic applications, gel superglue can also be used.
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Use rubber washers to dampen vibration
While threadlockers like Loctite Blue 242 are effective on metal surfaces, they can have adverse effects on plastic, causing it to become brittle and disintegrate. This is due to a chemical reaction between the solvent in threadlockers and plastic, which can lead to cracking and degradation. Therefore, it is recommended to avoid using threadlockers on plastic components.
When it comes to dampening vibration, rubber washers made from high hysteresis rubber are an excellent choice. This type of rubber has a unique ability to absorb vibrations by "springing back with a delay," effectively killing the vibration. Rubber mats or pads made from resilient rubber compounds with high elasticity and tension can also be used under vibrating equipment to absorb and reduce vibrations, making them ideal for use with washers and other machinery.
In addition to rubber, other materials such as polyurethane are effective at dampening vibrations. Polyurethane skateboard wheels, for example, can convert vibration into heat, providing a novel solution for vibration reduction. Sorbothane is another notable material in vibration damping, especially for optics applications. It is essential to consider the load and elasticity of the material; softer rubbers may deform under heavy loads, so a balance must be struck between vibration absorption and maintaining structural integrity.
To address the issue of vibrations in washers specifically, anti-vibration rubber pads or mats can be placed under the machines to reduce the transmission of vibrations to the surrounding structure. This not only lessens the noise but also helps protect the equipment and nearby items from the damaging effects of prolonged vibration. By investing in these rubber pads, you can effectively mitigate the impact of vibrations on your washer and create a quieter, more peaceful environment.
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Silicone caulk can be used to prevent screws from vibrating out
Threadlockers are used to prevent screws from loosening due to vibration. However, they are not suitable for use on plastics as they can cause the material to become brittle and disintegrate. Loctite, a common threadlocking adhesive, is known to react with plastic in this manner.
For example, in a discussion on a boat-building forum, a user reported that screws on their rub rail had loosened during a 30-mile offshore run. They were advised to use a marine sealant for in-hull tapping screws to make the hole watertight and prevent further loosening. Another user recommended using nylock nuts for stainless steel bolts, while also suggesting silicone as a suitable alternative.
Silicone caulk is also recommended for use on plastic items in another forum discussion. In this case, the user was seeking advice on using threadlocker on plastic screws for a 3D-printed body. Other users warned against using threadlocker on plastic, with one suggesting a silicone gasket sealer instead. This user reported success with silicone, stating that it kept the screws from vibrating out while still being removable.
Therefore, silicone caulk is a suitable alternative to threadlockers for preventing screws from vibrating out, especially when working with plastic or when a watertight seal is required. It provides flexibility, cushioning, and grip, making it ideal for applications subject to constant vibration or movement.
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Frequently asked questions
No, threadlockers should not be used on plastic. Some threadlockers will eat into the plastic, causing it to become brittle and crack.
Yes, Loctite 425 Assure is a threadlocker that can be used on plastics and metals. It is blue in colour and is basically just blue Krazy Glue.
Some alternatives to threadlockers for use on plastic include GE silicone caulk, Gorilla glue, and hot glue.
