LOCTITE 420
Harmonization Code : 3907.30.00.40 | Epoxy Mold Compounds containing by weight more than 70 % silicon dioxide
Main features
- Very-Low-Viscosity Capillary Bonding
- Fast Close-Fitting Assembly
- Broad Metal-Plastic-Rubber Bonding
Product Description
LOCTITE 420 is a one-component, very-low-viscosity ethyl cyanoacrylate instant adhesive for general-purpose bonding of plastics, rubbers, and metals. The transparent, colorless-to-straw liquid requires no mixing and cures with atmospheric moisture. At 22 deg C and 50% relative humidity, fixture times range from under 5 seconds on neoprene and nitrile rubber to 5 to 15 seconds on aluminum and 10 to 30 seconds on degreased mild steel. After 24 hours at 22 deg C, grit-blasted steel lap shear strength is 15 to 26 N/mm^2. The material is intended for thin, close-fitting bond gaps.
Key features
- Very-Low-Viscosity Flow: A 1 to 5 mPa s viscosity supports capillary flow into thin, close-fitting joints.
- Fast Close-Fitting Assembly: Neoprene and nitrile fixture in under 5 seconds under the listed ambient condition.
- Broad Substrate Bonding: The adhesive bonds plastics, rubbers, and metals with substrate-specific strength data.
Applications / Suitable for
- General-purpose plastic bonding
- Rubber and elastomer bonding
- Thin, close-fitting metal joints
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Thermal Properties
Physical Properties
Electrical Properties
Curing Conditions
Additional Information
As-supplied / before-processing properties
Typical values for the uncured or as-supplied product unless otherwise noted.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Transparent, colorless to straw | - | Uncured |
| Specific gravity | 1.05 | - | 25 deg C |
| Viscosity | 1 to 4 | mPa s | Cone and plate, shear rate 3,000 s^-1, 25 deg C |
| Viscosity | 1 to 5 | mPa s | Brookfield LVF, spindle 1, 6 rpm, 25 deg C |
| Vapor pressure | <1 | hPa | As supplied |
After-processing / final-state properties
Typical values for the cured product under the listed methods and conditions.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Coefficient of thermal expansion | 100 x 10^-6 | K^-1 | ISO 11359-2; cured 24 hours at 22 deg C |
| Thermal conductivity | 0.1 | W/(m K) | ISO 8302; same cure |
| Softening point | 165 | deg C | DIN EN 1427; cured material |
| Dielectric breakdown strength | 25 | kV/mm | IEC 60243-1; cured material |
| Lap shear strength | 15 to 26 | N/mm^2 | Grit-blasted steel; cured 24 hours at 22 deg C |
| Lap shear strength | 12 to 19 | N/mm^2 | Grit-blasted aluminum; cured 24 hours at 22 deg C |
| Tensile strength | 12 to 25 | N/mm^2 | ISO 6922; steel; cured 24 hours at 22 deg C |
