LOCTITE EA 3942

Harmonization Code : 3214.10.00 | Putty and other mastics | Resin cements, caulking compounds and other mastics

LOCTITE EA 3942

Main features

  • 900-1,600 mPa s Dispensing
  • Sub-5-Second UV Fixture
  • UV-Fluorescent Assembly Inspection

Product Description

LOCTITE AA 3942 is a one-part, medium-viscosity UV and visible-light acrylic adhesive for disposable medical-device assembly. It is specifically designed for bonding stainless-steel cannulae into hubs, syringes and lancets and also bonds the specified plastic, glass and metal substrates. The 900 to 1,600 mPa s viscosity at 25 deg C supports controlled needle-assembly dispensing, while fixture develops in less than 5 seconds under the stated 365 nm UV conditions. UV fluorescence supports adhesive-presence inspection, and the cured material reaches Shore D 76 with 29 N/mm^2 tensile strength under the stated cure.

Key features

  • Controlled needle dispensing: Typical viscosity is 900 to 1,600 mPa s at 25 deg C.
  • Fast UV fixture: Fixture develops in less than 5 seconds at 30 mW/cm^2 and 365 nm on glass.
  • UV inspection: Positive fluorescence supports adhesive-presence checks in bonded assemblies.

Applications

Applications include stainless-steel cannula bonding in hubs, syringes and lancets, plus documented plastic, glass and metal bonding for disposable medical-device assembly.

Product Family

LOCTITE EA 3942

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Transparent to hazy liquid, free of undissolved solids
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.
1.03
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
900 - 1,600 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.
15 %
Thermal Properties
Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding. The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.
55 °C
Chemical Properties
Water Absorption
5.0/4.8 %

Additional Information

Technical properties

As-supplied properties

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

Property Value Unit Method / condition
AppearanceTransparent to hazy liquidFree of undissolved solids
UV fluorescencePositiveInspection under UV light
Specific gravity1.03At 25 deg C
Gardner color3 or lessTypical limit
Viscosity900 to 1,600mPa sBrookfield RVT, spindle 2, 20 rpm, 25 deg C
Technical properties

Final-state properties

Typical cured-material values after 100 mW/cm^2 at 365 nm for 30 seconds using an electrodeless D bulb, unless otherwise stated.

Property Value Unit Method / condition
Shore hardness76Durometer DISO 868
Linear shrinkage2.0%Cured material
Elongation at break15%ISO 527-3
Glass transition temperature55deg CASTM E 228
Tensile strength29N/mm^2ISO 527-3
Tensile modulus986N/mm^2ISO 527-3
UV depth of cureAt least 1.5mm100 mW/cm^2 at 365 nm for 10 seconds, electrodeless D bulb
Block shear strength11.1N/mm^2Polycarbonate to polycarbonate, 100 mW/cm^2 at 365 nm for 10 seconds

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