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PERMABOND UV681

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Permabond UV681 — UV/light-activated adhesive, Shore D 50-65.

UV conformal coating — protective coating for smart card microchips and electronic components.

Price on request

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  • Brand
  • Container
  • Color
  • Country of origin
  • Chemical group
  • Viscosity (adhesives)
  • Viscosity at 20 rpm
  • Specific Gravity
  • Curing Wavelength
  • Storage Temperature (°C)
  • Tensile strength (ISO37)
  • Refractive index
  • Elongation at break (elasticity) (ISO37)
  • Hardness (Shore D)
  • Dielectric Strength
  • Water absorption (ISO62) 2 hrs in boiling water
  • UFI (Unique Formula Identifier)

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UV-curing metal, plastic, glass, solvent-free

 
General Terms and Conditions

Shipping usually within 1 to 3 business days
(Availability confirmed after order)

Express logistics. Fast and reliable within Switzerland & Europe

From Swiss stock Dispatch within 24h Batch certificate Invoice 30 days (B2B) Technical advice
Shipping & Delivery

Usually 1 to 3 business days

Availability is confirmed after order receipt.

Express logistics within Switzerland & Europe.

Terms and Conditions →

Product data

HS Code: 3506.9190000

HS Code: 3506.9190000

PERMABOND UV681
PERMABOND UV681
Permabond · Permabond Engineering Adhesives Ltd ·

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.

APPLICATION PROFILE

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.

Permabond UV681 in figures
>98 %
Light transmission
Conformal
Coating
Wave solder-resistant
High temperature
320–420 nm
Extended spectrum

What distinguishes Permabond UV681

Conformal Coating
Protective coating for microchips and electronic components.
>98% light transmission
Crystal-clear optics — also for LEDs and optical components.
Surface dry
Non-sticky after UV curing.
Wave solder-resistant
Tg 55 °C — withstands wave soldering processes.
Low viscosity
80–120 mPa·s — uniform, bubble-free coating.
Extended UV spectrum
320–420 nm — Applicable to standard UV lamps.

What is Permabond UV681 used for?

Smart card microchip protection
Encapsulation against environmental influences.
Electronic protective coating
Protection against vibrations and environmental pollution.
LED encapsulation
>98% light transmission.
Conformal coating printed circuit boards
PCB protection with UV curing.
Optical coatings
Transparent protective layer.

Processing

1
Clean surfaces
Prepare bonding surfaces clean, dry, and free of grease — degrease with isopropanol or acetone. For aluminum/copper, lightly sand to remove the oxide layer. For plastics, check compatibility.
2
Apply adhesive thinly
Apply Permabond UV681 thinly and evenly – directly from the bottle or using a dispensing device. Keep the adhesive protected from light. Avoid air bubbles.
3
Join and align components
Assemble quickly and precisely. For glass bonding, spread the adhesive into a thin film by applying pressure. Do not move components during UV curing.
4
Cure with UV light
Aim the UV lamp at the bond line. Curing time depends on lamp power, wavelength, and light transmission of the components — typically 1–5 seconds with a 30 W/cm² light guide system, or 5–15 seconds with a 4 mW/cm² low-power lamp.
5
Full strength after UV exposure
After complete UV curing, the components are immediately handleable. Final strength is achieved immediately after irradiation. For dual-cure products (UV + anaerobic), allow an additional 24 hours for complete anaerobic curing of shadow areas.
Data Sheets & Safety Data Sheet
Complete TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

Recommended accessories

Permabond Cleaner A Aerosol
Spray cleaner for rapid degreasing of bonding surfaces before applying the UV adhesive — reliably removes oil, grease, and release agents.
To the product →
Permabond UV620 — Glass Standard
Optically clear glass-metal UV adhesive for high-quality glass furniture — the all-rounder of the UV series.
To the product →
Permabond UV630 — Biocompatible Plastic
UV adhesive for plastics (polycarbonate, acrylic) — biocompatible per ISO 10993-5, long-wavelength curing 365–420 nm.
To the product →
Permabond UV7141 — Dual-Cure UV+Anaerobic
UV + anaerobic dual curing for shadow areas — ceramic-coated glass, backlit mirrors, overlapping bonding surfaces.
To the product →

Important Notes

Not suitable for / Important notes
Conformal coating, not an adhesive in the traditional sense — protects components but does not bond materials together. Store away from light.
Storage
Store at 5 to 25 °C and protect from direct light exposure. Curing begins under UV light — keep the bottle in the dark and only open under UV-blocked light.

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 →
ApplicationConformal Coating UV coating (electronics)Higher viscosity for domingSpecial Dual-Cure UV+HeatAdhesive instead of coating
Viscosity80–120 mPa·s1,000–1,600 mPa·s—250 mPa·s
Substrate Strength—DomingBlack UV+HeatPolycarbonate
Elongation at break>50 %>50 %—110 %
Topics & Application Fields
Key terms related to this product. Also useful for our search and filters.
UV-curing metal, plastic, glass, solvent-free

Technical data for PERMABOND UV681

All 18 product information 5 Performance at final strength 5 Physical properties 5 Curing values ​​1 Mechanical properties 1 Thermal properties 1
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

Please refer to the technical data sheet (TDS) in the "Documents" tab for binding values.

Documents and data sheets

Click on a document for the preview or the download icon for direct download.

Technical Data Sheets (TDS) 3
Permabond UV681 - Technical Data Sheet DE.pdf
309 KB
Permabond UV681 - Technical Data Sheet EN.pdf
314 KB
Permabond UV681 - Fiche Technique FR.pdf
283 KB
Safety Data Sheets (SDS) 3
Permabond UV681 - Safety Data Sheet DE.pdf
480 KB
Permabond UV681 - Safety Data Sheet EN.pdf
475 KB
Permabond UV681 - Fiche de Sécurité FR.pdf
480 KB

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.

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Product Specifications

Product Information
Container 50 ml or 1 l
Manufacturer Permabond Engineering Adhesives Ltd
Brand Permabond
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
Keywords
Keywords
UV-curing metal, plastic, glass, solvent-free

Documents and data sheets

Safety Data Sheets (SDS) and Technical Data Sheets (TDS) for download: