Sealing plastic on plastic often requires specialized adhesives or bonding techniques tailored to the specific types of plastic involved.
Choosing the Right Method for Plastic Sealing
Not all plastics bond or seal easily. Materials like Polypropylene (PP) and Polyethylene (PE) are known for being difficult to bond due to their low surface energy. Other plastics like PVC are often more receptive to bonding.
For effectively sealing or bonding plastic on plastic, particularly for those challenging types, selecting the correct adhesive is crucial.
According to the provided reference, for difficult-to-bond plastics like PP and PE, reaching for the Loctite Plastics Bonding System is recommended. This product is a two-part system that also works on PVC, requires no mixing, and sets quickly in seconds, making it suitable for fast repairs or assemblies.
For applications needing a rigid, high strength bond that is also impact-resistant and will not shrink, the Loctite Plastic Bonder is suggested. This product is also mentioned in the reference as an option for durable plastic-to-plastic bonds.
Recommended Adhesives for Plastic Bonding/Sealing
Based on the reference, here are two specific Loctite options:
-
Loctite Plastics Bonding System:
- Type: Two-part system (often an activator and an adhesive)
- Suitable For: Difficult plastics like PP, PE, and also PVC
- Key Features: No mixing required, sets in seconds, designed for challenging plastic types.
- Best For: Quick bonding of problematic plastics, small repairs.
-
Loctite Plastic Bonder:
- Type: Likely a structural adhesive designed for plastics.
- Suitable For: Creating strong plastic-to-plastic bonds.
- Key Features: Provides a rigid, high strength, impact-resistant bond that doesn't shrink.
- Best For: Applications requiring durability and strength in the bond.
General Steps for Bonding Plastic
While the specific Loctite systems have their own instructions, here are general steps often involved in plastic bonding to achieve a good seal:
- Identify the Plastic Type: If possible, knowing the type of plastic (e.g., PP, PE, PVC, ABS) helps in selecting the most appropriate adhesive.
- Clean the Surfaces: Ensure both plastic surfaces are free from dirt, grease, oil, and moisture. Use a suitable plastic cleaner or isopropyl alcohol and let them dry completely.
- Surface Preparation (if required): Some bonding systems, like the Loctite Plastics Bonding System, may involve a surface activator applied before the adhesive. Follow the product's instructions carefully. For other adhesives, light sanding might be recommended, but be cautious as it can damage the appearance.
- Apply Adhesive: Apply the chosen adhesive according to the product's specific instructions. Use only the necessary amount.
- Join the Pieces: Bring the plastic pieces together and hold them firmly in place.
- Allow to Cure: Let the bond cure for the time specified by the adhesive manufacturer. Avoid stressing the joint during this period.
Summary of Plastic Bonding Options (from reference)
| Product Name | Plastic Types Handled | Key Features | Bond Type |
|---|---|---|---|
| Loctite Plastics Bonding System | PP, PE, PVC (Difficult Plastics) | Two-part, no mixing, sets in seconds | Fast bond for challenging materials |
| Loctite Plastic Bonder | Plastics (for high-strength bonds) | Rigid, high strength, impact-resistant, won't shrink | Durable, strong, structural bond |
Choosing the right adhesive based on the plastic type and the required bond strength and flexibility is essential for successfully sealing plastic on plastic. Products specifically formulated for difficult plastics, like those mentioned in the reference, are often the best starting point.
