Permabond UV006810050B0101, UV681 UV-Curable Adhesive, 50ml Bottle, Case of 10
Permabond UV006810050B0101, UV681 UV-Curable Adhesive, 50ml Bottle, Case of 10
Permabond UV681 is a low-viscosity, UV-curable acrylate developed for coating electronics and smart card microchips. It offers an optically clear, tack-free finish to help protect against environmental and vibrational damage. This listing is SKU UV006810050B0101, supplied as ten 50 mL bottles per case.
Best Uses / Applications
Use UV681 for professional electronics coating, including conformal-coating applications and smart card microchip protection, where curing light can reach the material. Its low viscosity supports even coverage; careful dispensing remains essential to avoid entrapped air. The manufacturer also identifies UV681 as an option in its phenolic-material guidance when light access and the application requirements permit. Validate electrical, thermal and environmental performance on the actual assembly before production.
Key Features
- Cure on demand with suitable UV equipment.
- Low viscosity of 80–120 mPa·s at 25°C for coverage.
- Optically clear, tack-free cured formulation.
- Fast curing with low-power lamps under the TDS test conditions.
- 100% solids with no solvents.
- Suitable for evaluation in wave-soldering processes; brief high-temperature exposure requires appropriate stress and process conditions.
Technical Specifications
| Specification | Typical manufacturer data |
|---|---|
| Grade / SKU | UV681 / UV006810050B0101 |
| Packaging | 50 mL bottle; case of 10 |
| Chemical composition | Acrylate |
| Uncured appearance | Colourless |
| Viscosity at 25°C | 80–120 mPa·s (cP) |
| Specific gravity | 1.1 |
| Cure wavelength | 320–420 nm; confirm LED peak-wavelength suitability with Permabond |
| Tensile strength, ISO 37 | 10–12 N/mm² / 1,450–1,700 psi |
| Light transmittance | >98% |
| Refractive index | >1.490 |
| Elongation at break, ISO 37 | >50% |
| Hardness, ISO 868 | 50–65 Shore D |
| Water absorption, ISO 62 | <2% after two hours in boiling water |
| Glass transition temperature, DSC at 20°C/min | +55°C |
| Minimum cured exposure temperature | −55°C, depending on the materials being bonded |
| Liquid storage temperature | 2–7°C / 35–45°F; protect from room lighting |
| Technical source | Global TDS Revision 7, June 8, 2018; typical guideline data, not a product specification |
Fixture Time vs. Tack-Free Time
| TDS lamp condition | Typical fixture time | Typical tack-free time |
|---|---|---|
| Low-power 4 mW/cm² battery lamp | 7 seconds | 15 seconds |
| LED 100 mW/cm² lamp | 2 seconds | 5 seconds |
| UV light guide, 30 W/cm² | 1 second | 1–2 seconds |
These are lamp-dependent examples, not universal cure guarantees. Cure depends on spectral output, intensity, distance and substrate transmission. Confirm the LED peak wavelength with Permabond and validate your exposure process. Fixture time and a tack-free surface are different endpoints.
Application and Surface Preparation
Surfaces should be clean, dry and grease-free. Remove silicone-based cleaning residues. The TDS notes that light abrasion can benefit aluminium, copper and its alloys; isopropanol can degrease many surfaces, but test thermoplastic compatibility and consider mold-release contamination.
Dispense directly from the bottle or use automated equipment for controlled dosing while minimizing ambient-light exposure. Apply an even layer, dip, or dispense a bead as appropriate. Allow material to spread outwards and avoid trapping air; a spreader or roller can introduce bubbles. Cure with a suitable, validated light source. Do not use in contact with strong oxidizing materials. Read the SDS before handling.
Coating Selection Guidance
| Application priority | Selection consideration |
|---|---|
| Low-viscosity electronics coating | UV681 is formulated for good coverage and a clear, tack-free finish. |
| Doming or encapsulation | Permabond discusses UV683 for these applications; assess viscosity and geometry rather than treating grades as interchangeable. |
| Phenolic components | Confirm light can reach the coating or bond and review electrical, thermal, non-corrosive and flame requirements with a specialist. |
| Shadowed or opaque areas | Do not assume UV681 will cure where suitable light cannot reach; obtain manufacturer process guidance. |
Frequently Asked Questions
How much material is included?
This SKU supplies ten 50 mL bottles of UV681 per case.
Is UV681 intended for electronics coatings?
Yes. Permabond developed it for coating applications, including electronics conformal coatings and smart card microchips.
Does UV681 contain solvent?
The TDS identifies it as 100% solids with no solvents.
Will any UV LED lamp work?
No universal lamp compatibility is stated. The TDS lists 320–420 nm and calls for confirmation that the LED's peak output matches the adhesive's photoinitiator.
Does the two-second LED example mean every coating is cured in two seconds?
No. Two seconds is a typical fixture time at the stated 100 mW/cm² LED condition; the listed tack-free time is five seconds. Actual requirements depend on the process.
Can I use it on phenolic components?
Permabond identifies UV681 in its phenolic application guidance where curing light can reach the material. Validate the particular substrate and assembly requirements.
Can it withstand wave soldering?
The manufacturer describes resistance to brief high-temperature processes such as wave soldering provided the joint is not unduly stressed. This is not a blanket continuous-temperature rating; validate your assembly and profile.
How should the liquid be stored?
The TDS specifies 2–7°C (35–45°F) and protection from room lighting. Follow the SDS and manufacturer handling instructions.
Manufacturer Application Video
Technical Documents and Manufacturer Resources
- UV681 Technical Data Sheet, Revision 7 (PDF)
- UV681 Safety Data Sheet (PDF)
- Permabond: Advances in Light Curing and Light-Curing Adhesives
- Permabond: How to Bond Phenolic
Related Resources
Explore our Conformal Coating & PCB Protection Resource Hub, browse Conformal Coating, or shop the Permabond collection.
For professional or industrial use only. Keep out of reach of children. Typical TDS values are selection guidance; test suitability under your operating conditions.
