LOCTITE EA E-20HP
Harmonization Code : 3506.91.90.99 | 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 ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other
Main features
- Glass-to-Wood Epoxy Bonding
- 20-Minute Working Window
- 20 kV/mm Dielectric Strength
Product Description
LOCTITE® EA E-20HP is a toughened, two-component industrial epoxy adhesive formulated for room-temperature bonding with a practical 20-minute working life at 23°C. The medium-viscosity resin and hardener mix at 2:1 by volume or 100:55 by weight and cure to an off-white bondline. The cured adhesive combines peel resistance, substrate-specific shear strength, chemical and solvent resistance, and electrical insulation. It is intended for general industrial bonding where moderate assembly time is needed across prepared metals, plastics, wood, glass, epoxyglass, dry concrete, and architectural materials. Bond performance depends on substrate condition, surface preparation, bondline, cure, and service environment.
Key features
- Toughened epoxy system: Forms a tough, off-white bondline with high peel resistance and high shear strength under the specified test conditions.
- Moderate processing window: Provides a typical working life of 20 minutes at 23°C and a 40-minute tack-free time.
- Controlled two-part mixing: Mix ratio is 2:1 by volume or 100:55 by weight, resin to hardener.
- Broad tested substrate set: Typical shear data are available for prepared metals, plastics, wood, epoxyglass, glass, and dry concrete.
- Electrical insulation: Typical dielectric breakdown strength is 20 kV/mm after the stated cure.
- Environmental resistance data: Retained lap-shear results are available after exposure to oils, fuel, water/glycol, humidity, water, acetone, and isopropanol.
Applications / Suitable for
General industrial bonding of prepared metals and plastics, dry concrete bonding, wood and glass bonding, epoxyglass assemblies, and architectural-material applications requiring a moderate room-temperature work life.
TDS, SDS & Technical Documents
Technical Specifications
No specifications available.
Additional Information
LOCTITE® EA E-20HP
A toughened, medium-viscosity, two-component epoxy for general industrial bonding. The 2:1 volume-mix system provides a 20-minute working life at 23°C, cures at room temperature, and develops an off-white bondline with peel resistance, substrate-specific shear strength, electrical insulation, and environmental resistance.
LOCTITE® EA E-20HP two-component epoxy adhesive.
As-supplied and processing essentials
Typical properties before cure
Typical reference values for the resin, hardener, and mixed adhesive. Values are not product specifications.
| Property | Value | Unit | Method or condition |
|---|---|---|---|
| Resin appearance | Pale yellow liquid | — | As supplied |
| Resin specific gravity | 1.0 | — | At 23°C |
| Resin viscosity | 65,000 | mPa·s (cP) | Brookfield RVT at 25°C; spindle 7, 20 rpm |
| Hardener appearance | Yellow liquid | — | As supplied |
| Hardener specific gravity | 1.1 | — | At 23°C |
| Hardener viscosity | 7,000 | mPa·s (cP) | Brookfield RVT at 25°C; spindle 6, 50 rpm |
| Mixed appearance | Off-white | — | After resin and hardener are combined |
| Mixed specific gravity | 1.03 | — | At 23°C |
| Mixed viscosity | 65,000 | mPa·s (cP) | Brookfield RVT at 25°C; spindle 7, 20 rpm |
Processing LOCTITE® EA E-20HP
Remove paint, oxide films, oils, dust, mold-release agents, and other contaminants from the bonding surfaces. Apply the mixed adhesive evenly to the surfaces, assemble promptly, and keep parts from moving while the bond develops. Higher temperatures accelerate cure, while larger mixed quantities and higher temperatures reduce working life.
Store unopened containers in a dry location at an optimal temperature of 8°C to 21°C. Storage below 8°C or above 28°C can adversely affect product properties. Keep containers closed, protect them from contamination, and do not return material removed during use to the original container. Use appropriate gloves, eye protection, and ventilation for the task.
Typical cured properties
Typical bond-strength data
The adhesive was cured for 5 days at 23°C. Results are specific to the listed substrate, preparation, cure, and test configuration and are not universal design values.
| Property | Value | Unit | Method or condition |
|---|---|---|---|
| Lap shear - mild steel, grit blasted | 22.6 | N/mm² (3,270 psi) | ISO 4587 |
| Lap shear - aluminum, acid etched and abraded | 28.2 | N/mm² (4,090 psi) | ISO 4587 |
| Lap shear - aluminum, anodized | 17.4 | N/mm² (2,530 psi) | ISO 4587 |
| Lap shear - stainless steel | 22.0 | N/mm² (3,190 psi) | ISO 4587 |
| Lap shear - polycarbonate | 3.9 | N/mm² (560 psi) | ISO 4587 |
| Lap shear - nylon | 1.8 | N/mm² (260 psi) | ISO 4587 |
| Lap shear - fir wood | 11.4 | N/mm² (1,660 psi) | ISO 4587 |
| Block shear - PVC | 7.9 | N/mm² (1,140 psi) | ISO 13445 |
| Block shear - ABS | 10.4 | N/mm² (1,510 psi) | ISO 13445 |
| Block shear - epoxyglass | 28.6 | N/mm² (4,140 psi) | ISO 13445 |
| Block shear - acrylic | 2.0 | N/mm² (290 psi) | ISO 13445 |
| Block shear - glass | 32.3 | N/mm² (4,690 psi) | ISO 13445 |
Performance evidence
Typical laboratory data show how the cured adhesive responds to selected environmental exposures, elevated-temperature testing, and dry-concrete bonding. These results apply to the stated specimens and conditions.
Retained lap-shear strength is shown as a percentage of initial strength after exposure.
| Environment | Exposure temperature (°C) | 500 h (% initial strength) | 1000 h (% initial strength) |
|---|---|---|---|
| Air | 87 | — | 137 |
| Motor oil (10W30) | 87 | 164 | 171 |
| Unleaded gasoline | 87 | 108 | 82 |
| Water/glycol 50/50 | 87 | 121 | 125 |
| Salt fog | 23 | — | 73 |
| 95% RH | 38 | — | 100 |
| Condensing humidity | 49 | — | 90 |
| Water | 23 | — | 81 |
| Acetone | 23 | 76 | 95 |
| Isopropanol | 23 | 87 | 125 |
- In hot-strength testing on acid-etched and abraded aluminum, retained lap-shear strength decreased as test temperature increased. Test specimens were cured 12 hours at 65°C plus 4 hours at 23°C with a 0.1 to 0.2 mm bondline.
- In a modified ASTM C881/C882-99 test on dry concrete, the concrete fractured before the adhesive failed. The adhesive is not recommended for use on wet surfaces.
Applications
LOCTITE® EA E-20HP is intended for general industrial assemblies that require a moderate working life and room-temperature cure. Confirm performance on the exact substrate grade, surface condition, joint geometry, and service environment.
Evaluate LOCTITE® EA E-20HP for your assembly
Krayden can help review substrate combinations, surface preparation, dispense format, working time, bondline control, cure conditions, and environmental requirements for your industrial bonding process.
