Crystal products are known for their clarity and elegant appearance. When it comes to bonding crystal glass, the process must be done with great care, as even a small mistake can lead to contamination from the adhesive. Standard glues are not suitable for this delicate material. Instead, light-curing shadowless glue—also called UV shadowless glue—is recommended for bonding crystal glass.
Shadowless glue works by reacting to ultraviolet (UV) light. The glue contains a photosensitizer that activates when exposed to UV light, causing the monomer in the glue to bond and harden. In theory, there is no residual glue left after full curing, and the process is almost completely complete once the UV light has been applied. However, it’s important to ensure that the UV light source is strong enough and positioned correctly for optimal results.
The bonding process should be carried out as follows:
- Use a soft cloth or paper towel dipped in acetone alcohol to gently wipe the surfaces of the crystal glass and the adherend. Make sure there is no oil, dust, or debris on the surface. If any impurities are present, clean them immediately before proceeding.
- Apply a small amount of the light-curing glue onto the bonding area. Then, press the two pieces together carefully to ensure the glue spreads evenly and fills the joint, while also eliminating any air bubbles that may form.
- Expose the bonded area to sunlight or a mercury lamp from a distance of about 10 cm. A curing time of 5 to 10 seconds is typically sufficient for initial positioning. However, the complete curing time depends on the power of the UV lamp and the distance from the surface. For best results, use a UV lamp with a wavelength between 200-400 nm, and allow a few minutes for full curing.
- Tip: Avoid applying too thick a layer of glue. The adhesive should be thin and evenly spread to ensure proper bonding and a clean finish.
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