LOCTITE 363

Harmonization Code : 3909.20.00.90 | Amino-resins, phenolic resins and polyurethanes, in primary forms : Melamine resins : Other

LOCTITE 363

Main features

  • Low-Viscosity Shallow Potting
  • Rapid 365 nm UV Cure
  • Dielectric Electronic Encapsulation

Product Description

LOCTITE AA 363 is a one-component, low-viscosity urethane methacrylate material for UV-light shallow potting and thin-film encapsulation. The transparent yellow liquid requires no mixing and flows into electronic assemblies that need photocured protection. Typical cure is 20 to 30 seconds at 100 mW/cm^2 with a 365 nm medium-pressure mercury lamp, with a 25-second tack-free time at the same wavelength and intensity. After cure, the material reaches Shore D 50 and has a dielectric breakdown strength of 34 kV/mm. Its function is limited to shallow electronic potting and thin protective encapsulation layers.

Key features

  • Low-Viscosity Encapsulation: A 100 to 400 mPa s viscosity supports shallow potting and thin-film coverage.
  • Rapid UV Cure: Typical cure is 20 to 30 seconds at 100 mW/cm^2 and 365 nm.
  • Electrical Insulation: The cured material provides 34 kV/mm dielectric breakdown strength under the listed test method.

Applications / Suitable for

  • Shallow potting of electronic assemblies
  • Thin-film encapsulation of electronic assemblies
Product Family

LOCTITE 363

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Chemistry Type
Acrylated urethane
Color
The color
Transparent yellow liquid
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
One component
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
Tack-Free Time
25 seconds minutes
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
100 to 400 mPa.s
Electrical Properties
Dielectric Strength
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.
34 kV/mm
Volume Resistivity
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.
2×10^15 Ohms⋅cm
Physical Properties
Depth of Cure
15 mm
Curing Conditions
Fixture Time
5 seconds

Additional Information

Technical properties

As-supplied / before-processing properties

Typical values for the uncured or as-supplied product unless otherwise noted.

PropertyValueUnitMethod / condition
AppearanceTransparent yellow-Uncured
Specific gravity1.1-25 deg C
Viscosity100 to 400mPa sBrookfield RVT, spindle 1, 20 rpm, 25 deg C
Technical properties

After-processing / final-state properties

Typical values for the cured product under the listed methods and conditions.

PropertyValueUnitMethod / condition
Coefficient of thermal expansion100 x 10^-6K^-1ISO 11359-2; cured material
Thermal conductivity0.1W/(m K)ISO 8302; cured material
Shore hardness50Durometer DISO 868; cured material
UV depth of cure>=1.8mm100 mW/cm^2 at 365 nm for 20 seconds
Dielectric breakdown strength34kV/mmIEC 60243-1; cured material
Volume resistivity2 x 10^15ohm cmIEC 60093; cured material
Tensile strength3 to 12N/mm^2ISO 6922; steel pin to glass; cured 20 seconds at 100 mW/cm^2 and 365 nm

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