Shadow-area insurance
The thermal cure step gives you a path to finish the bond where direct UV exposure is limited or blocked.
FLASHBOND product
UV-3607HT
UV / heat cure cationic epoxy
Hybrid UV plus thermal cure for shadowed areas
UV-3607HT is a single-component UV/thermal cure adhesive and sealant. It cures under moderate UV and elevated temperature for shadowed areas. Its low viscosity supports coating, capillary flow, and doming.
In plain English
UV-3607HT is the hybrid option for joints where light can tack the exposed area but heat must finish cure in blocked areas.
Product fit
Why buyers choose this grade
Still fast to fixture
The UV stage can lock parts in place in 5 to 10 seconds before the oven step happens later.
Good all-around physicals
A Shore D 80 cure, 5,000 PSI tensile strength, and high resistivity support electronics, sealing, and encapsulation work.
Good fit for
- Parts with hidden bond areas, undercuts, or shaded geometry
- Coating, capillary, and doming jobs that need low-viscosity flow plus thermal backup
- Electronics and sealing work where chemical resistance and 200°C service matter
Things to confirm first
- You need both UV access and a thermal post-cure path in the process plan.
- If the assembly cannot tolerate a 125°C oven cycle, use a direct-light or room-temperature dual-cure option instead.
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) | 3,000 to 4,000 cps |
| Specific gravity | 1.12 |
Cured material
| Glass transition (Tg) | 125°C |
|---|---|
| Hardness | Shore D 80 |
| Ultimate tensile strength | 5,000 PSI |
| Elongation at break | 4 to 6% |
| 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 |
| UV cure time | 5 to 10 seconds |
| Thermal cure | 30 minutes at 125°C |
Shelf life and storage
6 months from DOM at 0°C ± 5°C. Material will advance over time if stored above 5°C and is light sensitive.