UV Curing Acrylic-to-PET Bonding Adhesive

3321 UV Curing Acrylic-to-PET Bonding Adhesive is a light yellow transparent UV adhesive with broad plastic compatibility and good adhesion to a wide range of plastics. It offers low viscosity with good leveling, fast curing and a transparent, anti-yellowing cured layer, making it suitable for PET, APET, PE, TPU, TAC and some PP difficult-to-bond materials such as optical films and packaging boxes.

Technical Specifications

Key Features

• Broad compatibility with good adhesion to various plastics
• Low viscosity with good leveling
• Fast curing for efficient production
• Transparent cured layer
• Anti-yellowing for long-term clarity
• Ideal for difficult-to-bond materials
• Suitable for optical films and packaging boxes

Applications

• Bonding PET, APET, PE, TPU, TAC and some PP materials
• Optical film bonding
• Packaging box assembly
• Bonding of difficult-to-bond plastics
• Applications requiring a transparent, anti-yellowing bond

Operation and Curing Guide

1. Surface preparation: clean the surfaces to remove oil, dust and contaminants for maximum adhesion.
2. Dispensing: apply the adhesive evenly to the bonding area.
3. Assembly: position and join the parts, pressing to spread the adhesive and removing any excess before curing.
4. UV curing: expose the adhesive to UV light at 300 mJ/cm² until fully cured.
5. Inspection: verify a uniform bond with no whitening or bubbles.
6. Rework: gently separate bonded parts, clean the surfaces and re-apply the adhesive when repair is needed.

FAQ

Q1: What is the 3321 adhesive mainly used for?
3321 is a UV curing acrylic-to-PET bonding adhesive used for PET, APET, PE, TPU, TAC and some PP materials such as optical films and packaging boxes.

Q2: Does it bond difficult plastics?
Yes. 3321 offers broad compatibility and good adhesion to various plastics, including difficult-to-bond materials.

Q3: Why is low viscosity important?
The low viscosity provides good leveling, so the adhesive spreads evenly for a smooth, uniform bond.

Q4: Does the cured layer stay clear?
Yes. 3321 cures to a transparent layer with anti-yellowing performance for long-term clarity.

Q5: How fast does it cure?
3321 cures quickly under UV light at 300 mJ/cm².

Q6: What strength does it provide?
3321 has a Shore D 56 hardness, a tensile strength above 10 MPa and a shear strength of 6 MPa.

Q7: What are the storage conditions and packaging?
Store at 8-28°C in the original sealed container. Shelf Life is 12 months. Available in 1kg and 5kg packaging.