LOCTITE UK3173
Harmonization Code : 3907.30.00.40 | Epoxy Mold Compounds containing by weight more than 70 % silicon dioxide
Main features
- Low-Viscosity Resin Handling
- 45-Minute System Work Time
- Flame-Retardant Potting System
Product Description
LOCTITE UK 3173 Polyurethane Potting Resin is the low-viscosity polyurethane resin component of the LOCTITE UK 3173 / UK 3184 potting system. The clear to dark-brown resin has a typical viscosity of 75 mPa s at 25 deg C and is mixed with UK 3184 hardener at 1:4.8 by volume or 15:85 by weight. The combined material has a mixed viscosity of 2,250 mPa s, a 45 minute work time, and a 24 hour room-temperature cure. The resulting flame-retardant potting compound is used for encapsulation where controlled flow, electrical insulation, and a Shore A 80 cured material are required.
Key features
- Low-Viscosity Resin Component: The UK 3173 resin has a typical viscosity of 75 mPa s at 25 deg C.
- Defined UK 3184 Mix Ratio: Uses 1:4.8 by volume or 15:85 by weight with the specified hardener.
- Room-Temperature Potting Cure: The complete system cures in 24 hours at 25 deg C.
Applications
Applications include potting and encapsulation using the complete LOCTITE UK 3173 / UK 3184 resin-hardener system.
TDS, SDS & Technical Documents
Technical Specifications
Physical Properties
Viscosity
2,250 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
Viscosity (Part A)
75 mPa.s
Viscosity (Part B)
14,000 mPa.s
General Properties
Appearance
Opaque tan
Appearance at room temperature.
Chemistry Type
Polyurethane
Mix Ratio
15 to 85
The amount of a constituent divided by the total amount of all other constituents in a mixture
Specific Gravity
1.40
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.
Work life @25°C
0.75 hours
Work life is the amount of time we have to work with a material until it is no longer able to be easily worked and applied on a substrate.
It is based on the change in viscosity and it can rely on the application requirements.
Thermal Properties
Glass Transition Temperature (Tg)
-15 °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.
Electrical Properties
Dielectric Strength
14,57 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
6.61×10^12 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.
Additional Information
Technical properties
Resin properties
Values apply to the LOCTITE UK 3173 resin component before mixing.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Chemical type | Polyurethane resin | UK 3173 component | |
| Appearance | Clear to dark brown | As supplied | |
| Viscosity | 75 | mPa s | 25 deg C, Brookfield, spindle 1, 20 rpm |
| Specific gravity | 1.23 to 1.24 | 25 deg C |
Technical properties
UK 3173 / UK 3184 system properties
Final-state values apply only when UK 3173 resin is mixed with UK 3184 hardener at the specified ratio.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Mix ratio | 1:4.8 | by volume | UK 3173 resin : UK 3184 hardener |
| Mix ratio | 15:85 | by weight | UK 3173 resin : UK 3184 hardener |
| Mixed viscosity | 2,250 | mPa s | 25 deg C |
| Work time | 45 | min | 300 g mass at 25 deg C |
| Gel time | 150 | min | 300 g mass at 25 deg C |
| Cure schedule | 24 | h | 25 deg C |
| Hardness | 80 | Shore A | Cured system |
| Glass transition temperature | -15 | deg C | ASTM E1545, cured system |
