ECCOBOND 3730
Harmonization Code : 3919.10.80 | Other self-adhesive plastic rolls not exceeding 20 cm wide.
Main features
- Tack-Free in 15 Seconds or Less
- At Least 2.5 mm Cure Depth
- 17 kV/mm Dielectric Strength
Product Description
LOCTITE 3730 is a one-part, transparent amber acrylic sealant for UV/visible-light curing in LCD end-sealing. Typical viscosity is 22,000 to 28,000 mPa s at 25 deg C under the stated Haake test. At 40 mW/cm^2 measured at 365 nm, tack-free time is 15 seconds or less, while a 50-second exposure provides a listed UV cure depth of at least 2.5 mm. After cure, typical properties include Shore D 82 hardness, 17 kV/mm dielectric breakdown strength, and 7.0E+12 ohm*cm volume resistivity. The material is used as an electrically insulating end seal for LCD assemblies.
Key features
- 15-Second-or-Less Tack-Free Time: Measured at 40 mW/cm^2 and 365 nm with a high-pressure mercury arc source.
- At Least 2.5 mm UV Cure Depth: Measured after 50 seconds at 40 mW/cm^2 and 365 nm.
- 17 kV/mm Dielectric Breakdown Strength: Typical cured value is measured to IEC 60243-1.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Appearance
Transparent amber liquid
Appearance at room temperature.
Chemistry Type
Acrylate
Physical Properties
Viscosity
22,000 to 28,000 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
Electrical Properties
Dielectric Strength
17 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.
Volume Resistivity
7.0×10¹² Ohms⋅cm
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
Additional Information
Technical properties
As-supplied / before-processing properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Viscosity | 22,000 to 28,000 | mPa s | 25 deg C; Haake PK1, 20 s^-1; LMS |
| Tack-free time | <=15 | s | 40 mW/cm^2 at 365 nm; high-pressure mercury arc; LMS |
| UV cure depth | >=2.5 | mm | 40 mW/cm^2 at 365 nm for 50 s; LMS |
Technical properties
After-processing / final-state properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| CTE at -30 deg C | 55E-6 | 1/K | ISO 11359-2; typical |
| CTE at 30 deg C | 140E-6 | 1/K | ISO 11359-2; typical |
| CTE from 50 to 150 deg C | 190E-6 | 1/K | ISO 11359-2; typical |
| Shore hardness | 82 | Shore D | ISO 868; typical |
| Surface resistivity | 4.0E+15 | ohm | IEC 60093; typical |
| Volume resistivity | 7.0E+12 | ohm*cm | IEC 60093; typical |
| Dielectric breakdown strength | 17 | kV/mm | IEC 60243-1; typical |
