PERMABOND UV620
Harmonization Code : 3907.30.00.40 | Epoxy Mold Compounds containing by weight more than 70 % silicon dioxide
Main features
- Optically Clear Glass Bonding
- Yellowing-Resistant Cured Appearance
- Rapid Low-Power Lamp Cure
Product Description
Permabond UV620 is a single-part, optically clear methacrylate adhesive for UV-curing glass, crystal, and decorative assemblies. The colorless liquid has a typical viscosity of 2,200 to 2,900 mPa s at 25 deg C and is formulated to resist yellowing for appearance-sensitive bonds. Typical fixture time is 5 seconds with a 4 mW/cm^2 battery lamp and 1 second with a 30 W/cm^2 light guide, subject to lamp output and substrate transmission. The cured material has a refractive index above 1.490, typical tensile strength of 16 N/mm^2, and elongation above 80%.
Key features
- Optically Clear Bondline: Supports appearance-sensitive glass and crystal assemblies with a cured refractive index above 1.490.
- Yellowing-Resistant Appearance: Resists yellowing in appearance-sensitive decorative assemblies.
- Rapid Optically Clear Cure: Fixtures in 5 seconds with a 4 mW/cm^2 battery lamp under stated conditions.
Applications
Applications include bonding glass, crystal, glass furniture, decorative ornaments, and other appearance-sensitive glass objects.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Appearance
Colorless, clear
Appearance at room temperature.
Refractive index
>1.490
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.
Specific Gravity
1.0
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.
Physical Properties
Viscosity
2,200-2,900 mPa.s
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
Mechanical Properties
Elongation
>80 %
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.
Electrical Properties
Dielectric Strength
12 kV/mm
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material.
Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property.
As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
Chemical Properties
Water Absorption
<4 %
Other Properties
Storage Temperature
5 - 25 °C
Additional Information
Technical properties
As-supplied / before-processing properties
Fixture time depends on lamp power, spectral output, distance, and substrate transmission.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Chemical composition | Methacrylate ester | As supplied | |
| Appearance | Colorless, clear | As supplied | |
| Viscosity | 2,200 to 2,900 | mPa s | At 25 deg C; 20 rpm |
| Specific gravity | 1.0 | As supplied | |
| Fixture time | 5 | seconds | 4 mW/cm^2 battery lamp |
| Fixture time | 2 | seconds | 100 mW/cm^2 LED lamp |
| Fixture time | 1 | second | 30 W/cm^2 UV light guide |
| Cure wavelength | 365 to 400 | nm | Match lamp output to the photoinitiator |
Technical properties
After-processing / final-state properties
Strength and optical values are typical cured results for the stated methods.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Steel-to-glass tensile strength | 9 to 10 | N/mm^2 | ASTM D-2095-69 |
| Tensile strength | 16 | N/mm^2 | ISO 37 |
| Refractive index | >1.490 | Cured adhesive | |
| Elongation | >80 | % | ISO 37 |
| Hardness | 60 to 75 | Shore D | ISO 868 |
| Dielectric strength | 12 | kV/mm | Typical cured value |
| Dielectric constant | 4 | 1 MHz at 25 deg C | |
| Water absorption | <4 | % | ISO 62; 2 hours in boiling water |
