LOCTITE 493
Harmonization Code : 3506.10.00.00 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg
Main features
- Very-Low-Viscosity Capillary Bonding
- Fast Metal-Focused Fixturing
- Broad Rubber-Plastic Bonding
Product Description
LOCTITE 493 is a clear to slightly hazy, very-low-viscosity methyl cyanoacrylate instant adhesive for general-purpose bonding, with particular suitability for metals. The one-part liquid also bonds supported rubber and plastic substrates and cures through atmospheric moisture without mixing. A cone-and-plate viscosity of 1 to 4 mPa s supports capillary flow into very close-fitting joints. Fixture time ranges from under 10 seconds on neoprene and nitrile rubber to 20 to 60 seconds on tested metals under the specified conditions. Full chemical and solvent resistance develops after at least 24 hours.
Key features
- Very-low-viscosity capillary flow: A 1 to 4 mPa s viscosity supports penetration into very close-fitting bondlines.
- Metal-focused instant bonding: The methyl cyanoacrylate formulation is particularly suited to rapid metal assembly.
- Fast rubber and plastic fixture: Tested elastomers fixture in under 10 seconds, with short fixture times on ABS and other plastics.
Applications / Suitable for
- Capillary bonding of close-fitting metal joints
- Rapid rubber and elastomer bonding
- General-purpose plastic assembly
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Chemistry Type
Methyl cyanoacrylate
Color
Clear to slightly hazy, colorless liquid
The color
Component System
One component
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Specific Gravity
1.1
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
Linear thermal expansion
100x10^-6 K -1
Thermal Conductivity
0.1 W/m.K
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance.
Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
Physical Properties
Viscosity
1 to 10 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
Mechanical Properties
Peel Strength
<0.5 N/mm
Electrical Properties
Dielectric Strength
25 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.
Surface Resistivity
10×10^15 to 80×10^15 Ohms/sq
Volume Resistivity
2×10^15 to 10×10^15 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
20 to 40 seconds
Additional Information
Technical properties
As-supplied / before-processing properties
Typical values for the product before cure, application, or assembly.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Clear to slightly hazy, colorless liquid | - | Uncured |
| Chemical type | Methyl cyanoacrylate | - | As supplied |
| Components | One part | - | No mixing required |
| Specific gravity | 1.1 | - | 25 deg C |
| Viscosity | 1 to 4 | mPa s | Cone and plate, 25 deg C, shear rate 3,000 s^-1 |
| Viscosity | 1 to 10 | mPa s | Brookfield LVF, spindle 1, 60 rpm, 25 deg C |
| Vapor pressure | <1 | hPa | As supplied |
Technical properties
After-processing / final-state properties
Typical values for the cured or installed product under the listed conditions.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Fixture time, degreased mild steel | 20 to 40 | s | 22 deg C, 50% RH; time to 0.1 N/mm^2 shear strength |
| Fixture time, nitrile rubber | <10 | s | 22 deg C, 50% RH; time to 0.1 N/mm^2 shear strength |
| Fixture time, ABS | 10 to 30 | s | 22 deg C, 50% RH; time to 0.1 N/mm^2 shear strength |
| Coefficient of thermal expansion | 100 x 10^-6 | K^-1 | ISO 11359-2; after 24 h at 22 deg C |
| Lap shear strength, grit-blasted steel | 20 to 30 | N/mm^2 | ISO 4587; cured 24 h at 22 deg C |
| Lap shear strength, grit-blasted aluminum | 15 to 22 | N/mm^2 | ISO 4587; cured 24 h at 22 deg C |
| Dielectric breakdown strength | 25 | kV/mm | IEC 60243-1; after 24 h at 22 deg C |
