Product Name
Permabond UV645 UV glue high viscosity gap filling slow-flow plastic bonding clear transparent
Brief Description
Permabond UV645 is a single-part, fast-curing, high-viscosity UV curable adhesive. It is specifically engineered for robust and clear bonding of plastics, and also exhibits excellent adhesion to metals and glass. This adhesive is designed for gap-filling applications, offering a slow-flow characteristic and curing rapidly upon exposure to ultraviolet light.
Popular Applications & Uses
- Bonding a wide variety of plastics, including polycarbonate, PVC, PC/ABS, and acrylic.- Adhering metals and glass in various assemblies.- Applications demanding high shear strength, elongation, and impact resistance.- Joining substrates with differing coefficients of thermal expansion.- Utilized as a sealant due to its effective depth of curing capabilities.- General manufacturing and assembly processes.- Bonding clear acrylic and polycarbonate in signage, shields, retail displays, and protective enclosures.- High-performance Point-of-Purchase (POP) displays.- Assembly of mobile device housings.
Industries that Commonly Use It
- General Manufacturing- Plastic Fabrication- LED/Electronics (e.g., mobile device housings, optical sensor applications)- Sign & Display (e.g., retail displays, signage, protective enclosures)- Medical Device/ Prosthetics (for precision bonding and clarity)
Special and Unique Features
- Single-part adhesive formulation.- Fast curing on demand with UV light.- High viscosity for effective gap filling and controlled application.- Slow-flow characteristic prevents running on vertical or large surfaces.- Produces clear and transparent bonds (colourless appearance).- Composed of 100% solids with no solvents.- Demonstrates excellent adhesion to a diverse range of plastics, metals, and glass.- Offers very high shear strength, elongation, and impact resistance.- Ideal for bonding dissimilar substrates with varying coefficients of thermal expansion.- Possesses good depth of curing capabilities, allowing its use as a sealant.- Can endure brief exposures to higher temperatures, such as during paint baking or wave soldering processes.
Key Properties
- Chemical composition: Methacrylate ester.- Appearance: Colourless, clear.- Viscosity @ 25°C: 20 rpm: 8,000-10,000 mPa.s (cP); 2.5 rpm: 30,000-60,000 mPa.s (cP).- Specific gravity: 1.1.- Typical fixture time (acrylic): 10 secs (low power 4mW/cm² battery lamp); 4 secs (LED 100mW/cm² lamp); 2 secs (UV light guide 30W/cm²).- Cure wavelength: 365 - 420 nm.- Overlap shear strength (ISO4587): Polycarbonate >9 N/mm² (>1300 psi); PVC >5 N/mm² (>700 psi); PC/ABS >7 N/mm² (>1000 psi); Acrylic >1.5 N/mm² (>220 psi).- Tensile strength (ISO37): 11 N/mm² (1600 psi).- Refractive index: 1.490.- Elongation at break (ISO37): >70%.- Hardness (ISO868): 50-65 Shore D.- Dielectric strength: 25-30 KV/mm.- Dielectric constant: 1MHz@25°C 4.- Water absorption (ISO62) 2 hours in boiling water: <5%.- Operating temperature range (cured adhesive): -55°C (-67°F) to 120°C (248°F) continuous, with brief periods up to 204°C (400°F).
Surface Compatibility
- Plastics: Excellent adhesion to a wide range, including polycarbonate, PVC, PC/ABS, and acrylic.- Metals: Bonds effectively to various metals.- Glass: Forms strong bonds with glass surfaces.- Note: Surfaces must be clean, dry, and free of grease for optimal adhesion. Light abrasion may be beneficial for certain metals like aluminum and copper. Compatibility testing is recommended for thermoplastic surfaces.
Known backups / known substitutes
- Permabond UV670: A tough, flexible UV curable adhesive, particularly noted for metalized plastics.- Ultrabond 750 (Hernon): A UV curable acrylate adhesive used for sealing plastics.- Other Permabond UV adhesives: Such as UV620 for glass bonding or UV681 for tack-free coatings.- General adhesive categories: Cyanoacrylates (instant adhesives), Epoxies, Anaerobics (threadlockers, thread sealants), Structural Acrylics (MMA), Urethanes, and Solvent cements may serve as alternatives depending on specific application requirements.
Comparison Note
Permabond UV645 distinguishes itself as a high-viscosity, gap-filling UV adhesive specifically formulated for creating strong, optically clear bonds across plastics, metals, and glass. Its ability to cure rapidly on demand with UV light significantly accelerates production processes. The adhesive's high shear strength, elongation, and impact resistance make it particularly well-suited for demanding applications, especially those involving dissimilar materials with varying coefficients of thermal expansion. Furthermore, it is a 100% solids, solvent-free formulation, contributing to a cleaner and more efficient bonding process. Its good depth of cure also allows it to function effectively as a sealant, offering versatility beyond simple bonding.
