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Thermoset coils, thermoplastic coils, and hydraulic coils are three common types of electromagnetic coils. The key differences lie in material types, application scenarios, and performance characteristics. Below is a detailed comparison of their structure, performance, manufacturing processes, and applicable fields.
Type | Definition |
Thermoset Coil | The coil housing is made of thermoset materials (e.g., epoxy, phenolic resin), which cannot be reshaped once cured. |
Thermoplastic Coil | The coil housing is made of thermoplastic materials (e.g., PA66, PBT), which can be repeatedly heated and reshaped. |
Hydraulic Coil | Specifically designed for hydraulic system solenoid valves, with features like high pressure resistance, oil resistance, and corrosion resistance. |
Coil Type | Main Material | Characteristics |
Thermoset Coil | Epoxy resin, phenolic resin, DMC, BMC | High heat resistance, chemical resistance, and dimensional stability, but low toughness. |
Thermoplastic Coil | PA66, PBT, PC, PEEK | High toughness, easy to process, suitable for mass production. |
Hydraulic Coil | Typically thermoplastic housing with special sealing treatment | Excellent high-temperature, high-pressure, oil, and water resistance. |
Performance Indicator | Thermoset Coil | Thermoplastic Coil | Hydraulic Coil |
Heat Resistance | ✅ Excellent (200°C and above) | ❌ Good (100°C to 150°C) | ✅ Excellent (suitable for high-temp environments) |
Corrosion Resistance | ✅ Excellent | ❌ Moderate | ✅ Excellent (suitable for oil and corrosive environments) |
Water Resistance | ✅ Excellent (can achieve IP67) | ✅ Good, but requires additional sealing | ✅ Excellent (designed for harsh environments) |
Mechanical Strength | ❌ Low toughness, prone to cracking | ✅ High toughness, good impact resistance | ✅ High strength, suitable for high-pressure systems |
Processing Complexity | High, requires precise molding | Low, suitable for injection molding | Medium, requires specialized sealing processes |
Oil Resistance | Moderate | Moderate, requires additional sealing | ✅ Excellent (long-term oil contact) |
Cost | Medium | ✅ Low, suitable for mass production | ❌ High, specialized for hydraulic systems |
Processing Type | Thermoset Coil | Thermoplastic Coil | Hydraulic Coil |
Molding Method | Compression molding, casting | Injection molding, extrusion | Injection molding + sealing treatment |
Sealing Method | Epoxy resin potting, fully sealed | Partial sealing with O-rings or gaskets | Typically uses epoxy potting or sealing adhesives |
Repairability | Non-repairable after curing | Repairable through welding, cutting, reshaping | Typically does not require repairs |
Application Field | Thermoset Coil | Thermoplastic Coil | Hydraulic Coil |
Automotive | Engine control systems, brake systems | Dashboard, electric windows | Transmission control valves, power steering systems |
Industrial Automation | High-temperature environments, chemical equipment | General solenoid valves, pneumatic equipment | Hydraulic systems, hydraulic solenoid valves |
Outdoor Equipment | Power equipment, outdoor control boxes | Photovoltaic systems, outdoor solenoid valves | Hydraulic lifts, oil control valves |
Hydraulic Equipment | Rarely used | Rarely used | ✅ Widely used in hydraulic systems |
Coil Type | Advantages | Disadvantages |
Thermoset Coil | High heat resistance, chemical resistance, excellent dimensional stability | Low toughness, complex processing, non-repairable |
Thermoplastic Coil | Low cost, flexible processing, high toughness | Lower heat and chemical resistance compared to thermoset materials |
Hydraulic Coil | High pressure resistance, oil resistance, excellent waterproofing | High cost, complex sealing requirements |
Application Requirement | Recommended Coil Type | Reason |
High-temperature environments (above 150°C) | Thermoset Coil | Excellent heat resistance, suitable for harsh environments |
Mass production and low cost | Thermoplastic Coil | Easy to process, suitable for quick production |
Hydraulic systems (high pressure, oil resistance) | Hydraulic Coil | Excellent oil and pressure resistance, designed for hydraulic systems |
Outdoor or humid environments | Thermoset Coil / Hydraulic Coil | Both can achieve IP67 waterproof protection |
- Thermoset Coils are suitable for high-temperature and chemical-resistant environments, but their processing is complex and non-repairable.
- Thermoplastic Coils are suitable for mass production and general industrial applications due to their low cost and high toughness.
- Hydraulic Coils are specifically designed for hydraulic systems, with high pressure, oil, and water resistance, making them the preferred choice for hydraulic valves.
