Made to stay clear
This high-clarity, water-clear epoxy is built to hold optical clarity at elevated temperature.
FLASHBOND product
UV-6502CL
UV cure cationic epoxy, high clarity
Low-viscosity, water-clear UV epoxy that stays clear at temperature
UV-6502CL is a low-viscosity, high-clarity light cure epoxy adhesive that cures to a clear polymer and maintains optical clarity at elevated temperatures. It wets metals, ceramics, and glass and cures best with UVA wavelengths from 315 to 365 nm.
In plain English
UV-6502CL is a water-clear, low-viscosity epoxy for tight gaps and bonds where optical clarity matters.
Product fit
Why buyers choose this grade
Very easy wetting
At 200 to 500 cps, it is one of the lowest-viscosity grades in the lineup and can reach fine bondlines quickly.
Still behaves like an epoxy
Even with its optical focus, it keeps a rigid cure profile and a -55°C to 200°C operating range.
Good fit for
- Optical bonds where haze, yellowing, or loss of clarity would hurt the design
- Glass, ceramic, and metal assemblies with tight gaps that benefit from capillary flow
- Clear encapsulation or seal areas that still need good temperature performance
Things to confirm first
- Low viscosity is great for tight gaps, but it can run if the bondline is open or vertical.
- This grade is best with direct UVA access at 315 to 365 nm, so confirm the lamp and part geometry early.
Datasheet applications
- Electronics
- Encapsulation
- Sealant
Key features
- RoHS and REACH compliant
- Chemical resistance
- High bond strength
- Fast UV cure
Recommended substrates
- Metals
- Ceramics
- Glass
Packaging
- Syringes
- Bulk
Technical data
Material profile at a glance.
Typical values for reference only. Use these material, cured-state, and cure-window values to compare fit before confirming specifications.
Uncured material
| Chemical class | Cationic epoxy |
|---|---|
| Appearance | Clear |
| Viscosity (20 RPM at 25°C) | 200 to 500 cps |
| Specific gravity | 1.12 |
Cured material
| Glass transition (Tg) | 135°C |
|---|---|
| Hardness | Shore D 82 |
| Ultimate tensile strength | 5,000 PSI |
| Elongation at break | 4% |
| Operating temperature | -55°C to 200°C |
| Volume resistivity | 1 x 10¹⁴ Ω-cm |
Cure overview
| Wavelength | 315, 365 nm |
|---|---|
| Intensity | 100 to 300 mW/cm² |
Shelf life and storage
23°C ± 5°C, 1 year from DOM. Material is light sensitive.