PERMABOND UV681

Harmonization Code : 3907.30.00.40 | Epoxy Mold Compounds containing by weight more than 70 % silicon dioxide

PERMABOND UV681

Main features

  • Low-Viscosity Coating Application
  • Tack-Free UV-Cured Surface
  • Balanced Cured Strength and Hardness

Product Description

Permabond UV681 is a low-viscosity UV-curable acrylate coating for electronics protection and smart-card microchip coating. The coating has viscosity of 80 to 120 mPa s and cures to a tack-free surface. Cured values include tensile strength of 10 to 12 MPa and hardness of 50 to 65 Shore D. These characteristics support thin UV-cured protective layers requiring a dry surface and controlled cured hardness. The low-viscosity format is relevant to electronics and smart-card microchip surfaces where the complete coating area can receive UV exposure.

Key features

  • Low-Viscosity UV Coating: Viscosity is listed at 80 to 120 mPa s.
  • Tack-Free Cured Surface: UV cure produces a tack-free coating surface.
  • Cured Mechanical Profile: Cured values are 10 to 12 MPa tensile strength and 50 to 65 Shore D hardness.

Applications

Applications include electronics coating, conformal-coating protection, and smart-card microchip coating.

Product Family

PERMABOND UV681

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Colorless
Refractive index
The refractive index determines how much the path of light is bent, or refracted, when entering a material. It is calculated by taking into account the velocity of light in vacuum compared to the velocity of light in the material. The refractive index calculation can be affected by the wavelength of light and the temperature of the material. Even though it is usually reported on standard wavelengths it is advised to check the TDS for the precise test parameters.
>1.490
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.1
Physical Properties
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
80-120 mPa.s
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
>50 %
Chemical Properties
Water Absorption
<2 %
Other Properties
Storage Temperature
2 - 7 °C
Thermal Properties
Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding. The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.
55 °C

Additional Information

Technical properties

After-processing / final-state properties

Property Value Unit Method / condition
Cured coating surfaceTack-freeUV-cured coating characteristic
Tensile strength10 to 12MPaCured coating
Hardness50 to 65Shore DCured coating

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