Fasto UVM21 - UV Adhesives

Fasto UVM21 – UV & Visible Light Curable Adhesive for Plastics

Fasto UVM21 is a single-component, low-viscosity UV and visible light curable adhesive that forms a clear, flexible, and non-yellowing bond upon curing. It is specifically formulated for bonding transparent plastics, with excellent performance on acrylic sheets (PMMA) and other clear polymer substrates.

Its low viscosity allows the adhesive to spread quickly and uniformly, ensuring high precision and optical clarity—making it ideal for medical devices and signage applications where appearance and accuracy are critical.

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Key Features

  • UV & Visible Light Curing (≥310 nm)
    Cures efficiently under UV light and suitable visible light sources.
  • Low Viscosity (~400 cPs)
    Enables fast spreading and homogeneous bond lines.
  • Crystal Clear & Non-Yellowing
    Maintains long-term transparency.
  • Flexible Bond After Cure
    Absorbs minor stresses without cracking.
  • High Bond Strength
    Compressive shear strength up to 25 N/mm².
  • Wide Temperature Resistance
    Continuous service from -50°C to +120°C.

Benefits

  • Delivers invisible bonding for transparent plastic assemblies
  • Enhances aesthetic and functional quality of medical and signage products
  • Enables precise alignment before curing
  • Reduces rejection and rework in high-precision applications
  • Suitable for complex and delicate plastic bonding
Primary Application Sub-Applications Functional Purpose Key Performance Advantage
Transparent Plastic Bonding Acrylic sheets, transparent plastic parts Invisible bonding with optical clarity Cures to a clear, flexible bond
Acrylic Sheet Assembly Acrylic panels, display components Precise alignment and strong bonding Low viscosity enables uniform spread
Medical Equipment Assembly Transparent medical components High-precision bonding with cleanliness Controlled UV curing, non-yellowing bond
Signage & Display Bonding Sign boards, illuminated displays Aesthetic, bubble-free joints Excellent transparency and refractive match
Plastic-to-Plastic Bonding Clear plastic housings, covers Structural bonding without mechanical fasteners High compressive shear strength
Precision Optical Bonding Light-transmitting components Maintains light transmission efficiency UV-initiated cure with minimal haze
High-Accuracy Assembly Processes Components requiring positioning before cure On-demand curing after alignment UV/visible light activated curing

Surface Preparation

  • Ensure bonding surfaces are clean, dry, and free from dust, oil, and grease.
  • Protect the adhesive from premature UV exposure before curing.

Application Method

  1. Apply Fasto UVM21 to one bonding surface only.
  2. Assemble and position the parts accurately.
  3. Expose the entire bond line to UV or suitable visible light to initiate curing.
  4. Ensure complete exposure for uniform cure.

Curing Guidelines

  • Fixture time: 5–20 seconds (depending on light intensity)
  • Typical depth of cure: ~2 mm
  • Greater depths (up to 8 mm) achievable with high-intensity UV lamps and longer exposure
  • Designed for closely fitting joints

Additional Notes

  • Sunlight can cure the adhesive, but UV lamps are recommended for controlled, repeatable curing.
  • Dispensing systems must use black, UV-opaque tubing to prevent premature curing.

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