Permabond UV620 Medical Grade UV glue with High Optical Clarity, Very Clear, Transparent, thicker slow flow

Product Name: Permabond UV620 Medical Grade UV Glue with High Optical Clarity (Thicker/Slow Flow)

Permabond UV620 is a single-component, fast-curing, UV-curable adhesive designed for high-strength bonding of glass and metal. It is distinguished by its exceptional optical clarity and resistance to yellowing over time, making it the ideal choice for aesthetic applications like glass furniture and crystal display cases. Its medium-high viscosity provides a controlled flow, allowing for precise application on vertical surfaces or joints with larger gaps without dripping immediately.

Popular Applications & Uses
- Bonding glass to glass for furniture (tables, shelving, display cases).
- Bonding glass to metal (aluminum, steel, brass) for structural, load-bearing joints.
- Assembling decorative crystal and glass ornaments.
- Bevel bonding in architectural glass.
- Applications requiring an "invisible" bond line.

Industries that Commonly Use It
- Furniture Manufacturing
- Art and Decor (Glassware, Awards, Trophies)
- Architectural Glass and Glazing
- Lighting (Lampshades, fixtures)
- Optical Assembly

Special and Unique Features
- Optical Clarity: Cures crystal clear and resists yellowing, maintaining an invisible bond line.
- Cure on Demand: Remains liquid until exposed to UV light, allowing unlimited time for alignment.
- High Strength: Forms strong structural bonds capable of bearing weight (e.g., glass shelves).
- Controlled Flow: Thicker viscosity (~2,500 cP) prevents running and allows for gap filling up to 1.5mm.
- 100% Solids: Solvent-free formula means no shrinkage or outgassing during cure.

Key Properties
- Base: Methacrylate Ester
- Color: Clear / Colorless
- Viscosity: Medium-High (~2,200 - 2,900 cP)
- Hardness: ~65-75 Shore D
- Refractive Index: >1.490 (Matches glass closely)
- Elongation: ~80%
- Service Temperature: -55°C to 120°C (-65°F to 250°F)

Materials Bonded
- Glass (Soda Lime, Borosilicate, Crystal)
- Metals (Steel, Aluminum, Zinc)
- Some rigid plastics (Testing recommended)

Cure Information
- Cure Mechanism: UV Light (365 - 400 nm).
- Fixture Time: ~5 seconds (with low power lamp).
- Full Cure: Instant upon sufficient UV exposure.

Known backups / known substitutes for this product
- Loctite AA 350 or 358 (Classic glass bonding UV adhesives).
- Permabond UV610 (Similar but lower viscosity/thinner).
- Permabond UV625 (Gel version for non-sag vertical applications).
- Dymax 4-Series Optical Adhesives.

Comparison Note
- Permabond UV620 is the "Standard" for structural glass bonding. It hits the sweet spot in viscosity—thick enough not to run all over the table while you position the glass, but thin enough to settle into a bubble-free layer. Unlike cyanoacrylates (super glue) which can fog glass ("blooming"), UV620 remains perfectly clear.