LOCTITE AA 3381

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

LOCTITE AA 3381

Main features

  • Fast 365 nm Light Fixturing
  • High-Elongation Glass Joint Sealing
  • Dissimilar Rigid-Substrate Bonding

Product Description

LOCTITE AA 3381 is a one-component, medium-viscosity acrylated urethane adhesive for UV-light bonding, potting, and sealing. The translucent colorless liquid requires no mixing and is intended primarily for glass-to-metal joints exposed to thermal cycling and environmental conditions. It also bonds dissimilar rigid substrates and reaches fixture strength in 15 seconds or less under the specified 365 nm light conditions. The cured material combines Shore A hardness of at least 72 with 330% elongation. Block-shear performance is characterized for glass-to-glass, glass-to-steel, glass-to-aluminum, and polycarbonate assemblies. Applications include disposable medical-device assembly.

Key features

  • Glass-to-Metal Joint Sealing: The product is intended for potting and sealing glass-to-metal joints exposed to thermal cycling and environmental conditions.
  • High-Elongation Cure: The cured material provides 330% elongation with Shore A hardness of at least 72.
  • Fast 365 nm Fixture: Fixture strength develops in 15 seconds or less under the listed 365 nm light conditions.

Applications / Suitable for

  • Potting and sealing glass-to-metal joints
  • Bonding dissimilar rigid substrates
  • Disposable medical-device assembly
Product Family

LOCTITE AA 3381

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Chemistry Type
Acrylated urethane
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.
1.08
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
3,600 to 6,600 mPa.s
Chemical Properties
Water Absorption
4.9 %
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.
330 %
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.
37 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.
1.06×10^14 Ohms⋅cm

Additional Information

Technical properties

As-supplied / before-processing properties

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

PropertyValueUnitMethod / condition
AppearanceTranslucent colorless-Uncured
Specific gravity1.08-25 deg C
Viscosity3,600 to 6,600mPa sBrookfield RVT, spindle 4, 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
Shore hardness>=72Durometer AISO 868; cured 30 seconds at 100 mW/cm^2 and 365 nm, D bulb
Elongation at break330%ISO 527-3; same cure
Tensile strength at break7.91N/mm^2ISO 527-3; same cure
Tensile modulus18.6N/mm^2ISO 527-3; same cure
Dielectric breakdown strength37kV/mmIEC 60243-1; same cure
Block shear strength4.2N/mm^2ISO 13445; glass to glass; 0.127 mm gap; same cure
Block shear strength3.5N/mm^2ISO 13445; glass to steel; 0.127 mm gap; same cure

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