To permanently bond LEGO bricks, you typically use a solvent that melts the plastic surface, effectively welding the pieces together. One common method involves using Methyl Ethyl Ketone (MEK).
Bonding LEGO Bricks with MEK
LEGO bricks are made from ABS (Acrylonitrile Butadiene Styrene) plastic. Instead of using traditional adhesives, solvents like MEK work by slightly dissolving the plastic surfaces. When the solvent evaporates, the dissolved surfaces fuse together, creating a very strong, permanent bond.
Materials Needed
To bond LEGO bricks using MEK, you will need:
- LEGO Bricks: The pieces you wish to join.
- MEK (Methyl Ethyl Ketone): A potent solvent for ABS plastic.
- Applicator: A dropper or fine-tipped applicator is necessary for precise application.
- Safety Gear: Gloves and eye protection are recommended.
- Ventilation: Work in a well-ventilated area as MEK fumes can be strong.
The Bonding Process
Follow these steps for bonding LEGO bricks using MEK:
- Preparation: Ensure your workspace is well-ventilated. Wear gloves and eye protection. Position the LEGO bricks exactly as you want them to be bonded.
- Application: Using a dropper or fine-tipped applicator, apply a small amount of MEK to the surfaces of the LEGO bricks you wish to bond. This is where the solvent begins to soften the plastic.
- Sparse Application: It's essential to apply MEK sparingly to avoid excessive dissolution of the plastic. Too much can damage the bricks or create a messy bond.
- Joining: Immediately join the prepared surfaces of the LEGO bricks together.
- Holding: Hold the pieces firmly in place for a few seconds to ensure good contact as the solvent begins to evaporate and the plastic fuses.
- Curing: Allow the bonded pieces to sit undisturbed for several hours to ensure the bond fully cures and hardens.
Important Considerations
- Permanence: Bonding with MEK is permanent. The bricks cannot be separated without breaking the plastic.
- Safety: MEK is a strong chemical. Always use it in a well-ventilated area and avoid skin or eye contact.
- Availability: MEK may have restrictions on purchase or use depending on your location.
- Alternative: While MEK is effective, some modelers might use other ABS-specific plastic solvents or cements. However, the provided reference specifically highlights the use of MEK.
This method is particularly useful for creating static displays or models that need to withstand handling without falling apart.
