Permabond UV681 UV Curable Clear Coating Thin Flowable Low Viscosity to Smooth over Surfaces, Transparant, Crystal Clear Coating

PERMABOND UV681 is a cure-configurable coating. Since it's curable to UV light it makes for a very configurable and customizable curing coating. It is ideal for coating small parts and 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. Features & Benefits User-Controlled Clear Coating Cure on demand with UV Light Low viscosity for good coverage Tack free Fast curing with low-power lamps 100% solids, no solvent Physical Properties of Uncured Adhesive Chemical Composition Acrylate Viscosity @ 25°C 80 to 100 mPa.s (cP) Specific Gravity 1.1 Performance Characteristics UV Curing Wavelength 320 - 420 nm UV Curing Fixture Time (by strength of light) Low power 4mW/cm² battery lamp: 7 secsLED 100mW/cm² lamp: 2 secsUV light guide 30W/cm²: 1 sec UV Curing Tack-Free Time (by strength of light) Low power 4mW/cm² battery lamp: 15 secsLED 100mW/cm² lamp: 5 secsUV light guide 30W/cm²: 1-2 secs Tensile Strength 10-12 N/mm²  (1450-1700psi) Light Transmittance >98% Temperature Resistance 212f (100C) 60% strength 302f (150C) 18% strength Appearance High Clarity, Colorless, Optically Clear, Transparent Elongation (ISO37) >50% Hardness (ISO868) 50 to 65 Shore D *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 in order to match the LED lamp’s peak wavelength with that of the adhesive’s photoinitiator to ensure optimal adhesive cure.