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Technical Data
Typical values, not a specification. The technical data sheet (TDS) is binding.
Product Information
- Manufacturer
- Permabond Engineering Adhesives Ltd
- Brand
- Permabond
- Container
- 50 ml, 1 l
- Country of origin
- Italy
- UFI (Unique Formula Identifier)
- P6N0-V0P6-Q00Q-3643
Performance at Full Cure
- Tensile strength (ISO37)
- 10-12 N/mm²
- Refractive index
- >1,490
- Elongation at break (elasticity) (ISO37)
- >50%
- Dielectric Strength
- 12 KV/mm
- Water absorption (ISO62) 2 hrs in boiling water
- <2%
Physical Properties
- Color
- colorless
- Chemical group
- Acrylate
- Viscosity (adhesives)
- Low viscosity <500 MPas
- Viscosity at 20 rpm
- 80-120
- Specific Gravity
- 1.1
Curing values
- Curing Wavelength
- 320-420 nm
Mechanical properties
- Hardness (Shore D)
- 50-65
Thermal Properties
- Storage Temperature (°C)
- 2-7
Product Description
Permabond UV681 is a UV-curing conformal coating material — specifically for smart card microchips and electronic components for coating against environmental influences, shock and wave soldering stress.
Unlike adhesives, UV681 is a UV-curing coating material—it protects electronic components under a transparent, tack-free surface. Its low viscosity (80–120 mPa·s) ensures uniform, bubble-free coatings.
The high temperature resistance (glass transition temperature 55 °C, heat-resistant during wave soldering) and the >98% light transmittance make UV681 the ideal choice for smart card encapsulation, LED protection, and general electronic protective coatings. The extended curing spectrum of 320–420 nm also allows curing with conventional UV lamps.
UV coating material for electronics protection — protects smart card microchips and electronic components against environmental and shock stress. Crystal clear, non-sticky, bubble-free, wave solder resistant.
What distinguishes Permabond UV681
What is Permabond UV681 used for?
Processing
Recommended accessories
Important Notes
Which Permabond UV adhesive for which application?
Permabond UV681 in direct comparison with related products of the UV series.
Permabond UV681 Current Product | Permabond UV683 → | Permabond UV7220 → | Permabond UV630 → | |
|---|---|---|---|---|
| Application | Conformal Coating UV coating (electronics) | Higher viscosity for doming | Special Dual-Cure UV+Heat | Adhesive instead of coating |
| Viscosity | 80–120 mPa·s | 1,000–1,600 mPa·s | — | 250 mPa·s |
| Substrate Strength | — | Doming | Black UV+Heat | Polycarbonate |
| Elongation at break | >50 % | >50 % | — | 110 % |
Frequently asked questions about Permabond UV681
Practical application and design questions — answered by SILITECH.
Permabond UV681 is an acrylate (UV-curing) adhesive with a viscosity of 80–120 mPa·s. It provides conformal UV coating for smart cards and electronics, offering surface-dry protection. The adhesive cures upon exposure to UV light in the 320–420 nm spectral range, enabling instant curing on demand.
Permabond UV681 cures in the spectral range of 320–420 nm. Standard mercury vapor UV lamps, LED UV lamps with a suitable wavelength, or UV light guide systems are all suitable. For LED lamps, the maximum wavelength of the LED must be matched to the curing spectrum of the adhesive—we are happy to advise you on selecting the right lamp.
Permabond UV681 typically cures in: 15 s with a 4 mW/cm² low-power lamp; 2 s with a 100 mW/cm² LED lamp; 1 s with a 30 W/cm² UV light guide system. The exact curing time depends on the layer thickness and the light transmittance of the components.
Permabond UV681 typically bonds glass, metals, and plastics. See TDS for substrate-specific strength values.
Permabond UV681 is a conformal UV coating (electronics) (80–120 mPa·s viscosity, >50% elongation at break). Permabond UV683 is a doming coating (1,000–1,600 mPa·s, >50% elongation at break) — higher viscosity for doming.
When stored at 5 to 25 °C and protected from light, Permabond UV681 is stable until the printed expiration date. IMPORTANT: UV adhesives cure upon contact with light — always store the bottle in the dark and only open it briefly under UV-blocked light. Daylight-stable variants (e.g., UV675) can be used briefly under ambient light.
From the Permabond UV range, select according to substrate, viscosity, and special properties: Permabond UV681 (Conformal Coating UV coating (electronics)); Permabond UV683 (Doming Coating); Permabond UV7220 (Cationic Epoxy); Permabond UV630 (Biocompatible plastics). For shaded areas (where UV light does not fully reach the adhesive gap), a dual-cure variant such as Permabond UV7141 (UV + Anaerobic) should be used.