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UV681 Tack-Free Coating UV-Curable Adhesive, Clear
Permabond® UV681 has been developed for use as a coating. It is ideal for coating electronics (such as conformal coating) to protect against environmental and vibrational damage. The optically clear / tack-free formulation also makes this product particularly suitable for coating smart card microchips amongst various other applications. Its low viscosity ensures an even, bubble-free coating and high-temperature resistance allows it to resist wave soldering.
- Cure on demand
- Low viscosity for good coverage
- Tack free
- Fast curing with low-power lamps
- 100% solids, no solvents
Código PAC | C100364 |
---|---|
Marca | Permabond |
Tipo | Adhesivo UV |
Physical Properties of Uncured Adhesive
- Chemical composition: Acrylate
- Appearance: Colourless
- Viscosity @ 25°C: 80-120 mPa.s (cP)
- Specific gravity: 1.1
Typical Curing Properties
- Typical fixture time*
- Low power 4mW/cm2 battery lamp: 7 secs
- LED 100mW/cm2 lamp: 2 secs
- UV light guide 30W/cm2: 1 sec
- Tack free time
- Low power 4mW/cm2 battery lamp: 15 secs
- LED 100mW/cm2 lamp: 5 secs
- UV light guide 30W/cm2: 1-2 secs
- Cure wavelength: 320 - 420 nm**
*The cure time depends on the power of the UV lamp, its spectral output, the distance between the lamp and the components, and the transmission characteristics of the substrates.
**LED UV lamps have a narrow range of spectral output. It is important to check suitability with Permabond to match the LED lamp's peak wavelength with that of the adhesive's photoinitiator to ensure optimal adhesive cure.
Typical Performance of Cured Adhesive
- Tensile strength (ISO37): 10-12 N/mm2 (1450-1700psi)
- Light transmittance: >98%
- Refractive index: >1.490
- Elongation at break (ISO37): >50%
- Hardness (ISO868): 50-65 Shore D
- Water absorption (ISO62) 2 hours in boiling water: <2%
- Glass transition (Tg) DSC 20°C/min rate: +55°C
*Strength results will vary depending on the level of surface preparation and gap.