Introduction
Epoxy adhesive is a structural adhesive with high bonding strength. Suitable for bonding various substrates, especially with high bonding strength to metal materials.
| Property | Single-Component Epoxy | Two-Component Epoxy |
| Composition | Single resin with latent curing agent. | Resin + separate curing agent (e.g., polyamide). |
| Curing Method | Heat-activated (e.g., 80–180°C). | Mixing resin and curing agent; room temp. or heat-cured. |
| Key Applications | Fast-production electronics, low-temp processes, consumer goods. | High-strength bonding (metals, composites), aerospace, automotive. |
| Advantages | Simplified storage, rapid curing in heat, no mixing required. | Superior adhesion, chemical resistance, adjustable cure speed. |
| Limitations | Brittle when cured, limited shelf life (requires refrigeration). | Shorter pot life after mixing, requires precise mixing ratio. |
Compared to other types of adhesives, epoxy adhesives have better resistance to high temperatures and chemical corrosion, low shrinkage and cohesive strength, and are widely used in the fields of electronics, automotive, industry, and aviation.
Epoxy adhesives are divided into two types: single component and two-component. Single component epoxy adhesives can be divided into low-temperature curing epoxy, medium temperature curing epoxy, and high-temperature curing epoxy according to different curing temperatures. Low temperature curing epoxy is widely used in consumer electronics products. Its advantage is that the curing temperature is as low as 80 ℃ and the curing time can be controlled within 15-30 minutes. It can effectively meet the demand for fast production pace. Compared to single component products, two-component epoxy adhesives have a wider range of application scenarios and lower storage requirements. Typically, two-component epoxy does not require low-temperature storage.
At present, Moutainchem Electronics’ single component epoxy has mature applications in industries such as magnet bonding, motor bonding, VCM motor bonding, camera module bonding, and optical communication.
Epoxy Adhesive Systems Technical Summary
| Property | Single-Component | Two-Component |
| Composition | Pre-mixed resin/hardener | Separate resin & hardener |
| Curing Mechanism | Heat-activated | Chemical reaction at RT or heat-accelerated |
| Pot Life | N/A (pre-mixed) | 5 min – 24 hrs (varies by formulation) |
| Cure Time | 15-60 min @ 120-180°C | 2 hrs – 7 days (RT cure) |
| Typical Viscosity | 10.000-50.000 cP | 5.000-30.000 cP (resin) |
| Storage Conditions | -20°C to 5°C (uncured) | RT (separate components) |
| Shelf Life | 3-12 months | 12-24 months |
Performance Characteristics
| Parameter | Both Systems |
| Tensile Strength | 20-50 MPa |
| Shear Strength | 15-40 MPa |
| Temperature Resistance | -40°C to +150°C (standard) |
| Chemical Resistance | Excellent to oils, solvents |
| Shrinkage | <1% |
Application Comparison
| Feature | Single-Component | Two-Component |
| Ease of Use | Simple application | Requires mixing |
| Equipment Needed | Heating oven | Mixing tools |
| Best For | High-volume production | Custom applications |
| Bondable Substrates | Metals, ceramics | Metals, plastics, composites |
Safety & Handling
| Aspect | Both Systems |
| Skin Contact | Wear nitrile gloves |
| Eye Protection | Safety goggles required |
| Ventilation | Adequate airflow needed |
| Cured Material | Non-hazardous |
Note: Single-component systems offer processing efficiency while two-component systems provide formulation flexibility. Selection depends on production requirements, substrate types, and performance needs.
