LOCTITE AA 3751

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

LOCTITE AA 3751

Main features

  • Solvent-Free 100% Solids
  • 10-Second UV Fixture
  • Multi-Function UV Processing

Product Description

LOCTITE AA 3751 is a one-part, solvent-free modified acrylic ester adhesive for UV-light tacking, bonding, coating, encapsulating and sealing. The transparent amber-to-yellow liquid is 100% non-volatile and has medium, shear-dependent Brookfield viscosity for controlled dispensing and coverage. Under the stated UV conditions, fixture develops in 10 seconds or less on glass slides. Cured films reach Shore D 73 hardness and 50% elongation at break. This combination supports assembly processes that use one UV-curing material for bonding, coating, encapsulation and sealing.

Key features

  • Solvent-free formulation: The one-part material is 100% solids with no mixing required.
  • Fast UV fixture: Fixture develops in 10 seconds or less on glass slides at 6 mW/cm^2 and 365 nm.
  • Multi-function application: One grade supports tacking, bonding, coating, encapsulating and sealing.

Applications

Applications include UV-light tacking, bonding, coating, encapsulating and sealing.

Product Family

LOCTITE AA 3751

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Chemistry Type
Modified acrylic ester
Color
The color
Transparent amber to yellow liquid
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
One component
Solids
100 %
Physical Properties
Tack-Free Time
≤60 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
8,000 to 15,000 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 %
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.
29 kV/mm
Surface Resistivity
1.3×10^16 Ohms/sq
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.
5.4×10^14 Ohms⋅cm
Physical Properties
Depth of Cure
3.5 mm

Additional Information

Technical properties

As-supplied properties

Typical uncured-product values at 25 deg C unless otherwise stated.

Property Value Unit Method / condition
AppearanceTransparent amber to yellow liquidUncured
Solids / non-volatile content100%As supplied
Viscosity8,000 to 15,000mPa sBrookfield RVT, spindle 4, 2.5 rpm, 25 deg C
Viscosity3,600 to 7,000mPa sBrookfield RVT, spindle 4, 20 rpm, 25 deg C
Technical properties

Final-state properties

Typical cured-film values for 0.6 to 0.8 mm films cured at 30 mW/cm^2 and 365 nm for 2 minutes per side using a Zeta 7400 source, unless otherwise stated.

Property Value Unit Method / condition
Shore hardness73Durometer DISO 868
Elongation at break50%ISO 527-3
Tensile strength at yield22.7N/mm^2ISO 527-3
Tensile strength at break11N/mm^2ISO 527-3
Tensile modulus634N/mm^2ISO 527-3
UV depth of cure3.5mm25 mW/cm^2 at 365 nm for 10 seconds, Zeta 7400
Lap shear strength4.8N/mm^2ISO 4587, polycarbonate to polycarbonate; substrate failure

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