Permabond UV006810001L0101, UV681 UV-Curable Adhesive, 1 Liter Bottle
Permabond UV006810001L0101, UV681 UV-Curable Adhesive, 1 Liter Bottle
Permabond UV681 is a low-viscosity, UV-curable acrylate developed for coating electronics and smart card microchips. Its optically clear, tack-free finish helps protect against environmental and vibrational damage. SKU UV006810001L0101 supplies one 1 liter bottle, not a case of smaller bottles.
Best Uses / Applications
Use UV681 for professional electronics coating, including conformal coating and smart card microchip protection, where curing light can reach the material. Its low viscosity supports even coverage; careful dispensing remains necessary to avoid bubbles. The 1 L bottle is an option for larger coating runs and automated dispensing. Permabond also identifies UV681 in its phenolic-material guidance when light access and application requirements permit. Validate electrical, thermal and environmental performance on the actual assembly.
Key Features
- Cure on demand with suitable UV equipment.
- Low viscosity of 80–120 mPa·s at 25°C for good coverage.
- Optically clear, tack-free cured finish.
- Fast curing with low-power lamps under the stated TDS conditions.
- 100% solids, with no solvents.
- Manufacturer-described resistance to brief wave-soldering exposure, subject to process and stress conditions.
Technical Specifications
| Specification | Typical manufacturer data |
|---|---|
| Grade / SKU | UV681 / UV006810001L0101 |
| Package quantity | One 1 liter bottle |
| Chemical composition / uncured appearance | Acrylate / 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 / refractive index | >98% / >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 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 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 examples are not universal cure guarantees. Cure depends on lamp power, spectral output, distance and substrate transmission. Confirm LED peak-wavelength compatibility with Permabond and validate the exposure process. Fixture time and tack-free time are different endpoints.
Application and Surface Preparation
Clean and dry surfaces and remove grease and silicone-based cleaning residues. The TDS notes that aluminium, copper and its alloys may benefit from light abrasion. Isopropanol can degrease many surfaces; test thermoplastic compatibility and account for mold-release contamination.
Dispense directly from the bottle or use automated equipment for controlled dosing. Minimize ambient-light exposure and air entrapment. Apply as an even layer, dip or bead as appropriate, allowing material to spread outwards. A roller or spreader can help distribute material but may introduce bubbles. Cure with a suitable validated light source. Do not use in contact with strong oxidizing materials. Read the SDS before handling.
Coating and Package Comparison
| Option | Selection guidance |
|---|---|
| UV681, this 1 L bottle | Same UV681 grade in a larger single bottle for coating runs and controlled dispensing. |
| UV681, 50 mL bottles | Smaller package format; separate listing supplies a case of ten. |
| Doming or encapsulation applications | Permabond discusses UV683 for these uses; assess viscosity and geometry rather than treating grades as interchangeable. |
| Phenolic components | Verify light access and electrical, thermal, non-corrosive and flame requirements with a specialist. |
| Shadowed or opaque areas | Do not assume cure where suitable light cannot reach; obtain manufacturer process guidance. |
Frequently Asked Questions
Is this one bottle or a case?
This SKU supplies one 1 liter bottle of UV681.
Is the formulation the same as UV681 in 50 mL bottles?
Yes, both listings are the UV681 grade. Package size and sales quantity differ; the same grade TDS applies.
What applications is UV681 designed for?
Permabond developed it for coatings, including electronics conformal coatings and smart card microchip protection.
Does it contain solvent?
The TDS identifies UV681 as 100% solids with no solvents.
Will any UV LED lamp work?
Do not assume universal compatibility. The TDS lists 320–420 nm and calls for confirmation that the LED peak output matches the adhesive's photoinitiator.
Does the two-second LED example guarantee full cure?
No. Two seconds is the typical fixture time at the stated 100 mW/cm² condition, while the listed tack-free time is five seconds. Validate your actual process.
Can UV681 withstand wave soldering?
Permabond describes resistance to brief high-temperature processes provided the joint is not unduly stressed. This is not a blanket continuous-temperature rating; validate the assembly and profile.
How should I store the 1 L bottle?
The TDS specifies 2–7°C (35–45°F) and protection from room lighting. Follow manufacturer handling and SDS 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.
