LOCTITE 3922
Harmonization Code : 3907.30.00.40 | Epoxy Mold Compounds containing by weight more than 70 % silicon dioxide
Main features
- Low-Viscosity Cannula Bonding
- Fast UV/Visible-Light Fixturing
- Sterilization-Tested Needle Assemblies
Product Description
LOCTITE AA 3922 is a one-component, low-viscosity UV/visible-light acrylic adhesive for rapid needle assembly and other precision medical-device bonding. The transparent-to-hazy liquid requires no mixing, fluoresces under UV light for presence inspection, and fixtures glass in 10 seconds or less under the specified 365 nm exposure. It bonds stainless steel cannulae into hubs, syringes, and lancets. Cannula-bonding results cover multiple hub polymers and sterilization methods. At the specified cure condition, the material has 135% elongation, Shore D 66, and 18 N/mm^2 tensile strength. Its flow and cure profile suit small bond areas and controlled cannula placement.
Key features
- Low-Viscosity Cannula Bonding: A 150 to 450 mPa s viscosity supports controlled flow around small cannula-to-hub joints.
- Fast Light Fixture: Glass fixture strength develops in 10 seconds or less at the listed 365 nm condition.
- Sterilization-Tested Assemblies: Tested needle assemblies retained bond strength after listed gamma, EtO, and autoclave cycles.
Applications / Suitable for
- Bonding stainless steel cannulae into hubs
- Syringe and lancet needle assembly
- Disposable medical-device assembly
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Appearance
Transparent to hazy liquid
Appearance at room temperature.
Chemistry Type
UV acrylic
Component System
One component
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Specific Gravity
1.04
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.
Thermal Properties
Glass Transition Temperature (Tg)
75 °C
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.
Physical Properties
Tack-Free Time
>60 minutes
Viscosity
150 to 450 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
Chemical Properties
Water Absorption
7.2 %
Mechanical Properties
Elongation
135 %
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.
Electrical Properties
Dielectric Strength
37 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
1.06×10^14 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.
Curing Conditions
Fixture Time
≤10 seconds
Additional Information
Technical properties
As-supplied / before-processing properties
Typical values for the uncured or as-supplied product unless otherwise noted.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Transparent to hazy | - | Uncured |
| UV fluorescence | Positive | - | Uncured material under UV light |
| Specific gravity | 1.04 | - | 25 deg C |
| Viscosity | 150 to 450 | mPa s | Cone and plate, shear rate 1,000 s^-1, 25 deg C |
Technical properties
After-processing / final-state properties
Typical values for the cured product under the listed methods and conditions.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Glass transition temperature | 75 | deg C | ISO 11359-2; cured 30 seconds per side at 100 mW/cm^2 and 365 nm |
| Shore hardness | 66 | Durometer D | ISO 868; same cure |
| Elongation at break | 135 | % | ISO 527-3; same cure |
| Tensile strength | 18 | N/mm^2 | ISO 527-3; same cure |
| Tensile modulus | 630 | N/mm^2 | ISO 527-3; same cure |
| Block shear strength | 23.5 | N/mm^2 | ISO 13445; polycarbonate to polycarbonate; same cure |
