In industrial manufacturing and electronic equipment, choosing the right wire often determines product safety and reliability. Different application environments have strict requirements for temperature resistance, voltage rating, flexibility, and insulation performance. With high-temperature silicone wires widely applied in various devices, UL3135 and UL3239 have become two of the most popular models among engineers and manufacturers. While both are silicone rubber insulated wires, they differ significantly in performance and application. This article provides an in-depth understanding of these two wires, combined with practical examples and comparison analysis, helping you make a more informed and efficient selection.
What is UL3135 Cable?
UL3135 is a high-temperature silicone rubber insulated wire widely used in industrial and household appliance applications and complies with the UL758 standard. It features a finely stranded tinned copper conductor, which ensures excellent conductivity while effectively preventing oxidation and corrosion. Its silicone rubber insulation can operate safely in temperatures from -60℃ to +200℃, providing excellent flexibility and weather resistance.
One of UL3135's biggest advantages is its outstanding flexibility. It can bend easily in confined spaces or complex wiring environments without compromising conductor or insulation integrity. Additionally, UL3135 is flame-retardant, low-smoke, and halogen-free, ensuring electrical safety while meeting environmental requirements. This makes it a common choice in industrial equipment, household appliances, lighting devices, and control systems.
For instance, in an industrial hot air machine that operates continuously, UL3135 wires can withstand high temperatures around the motor while maintaining stable electrical performance, providing long-term protection for equipment.
What is UL3239 Cable?
Compared with UL3135, UL3239's most notable feature is its high voltage withstand capability. This wire is specifically designed for high-voltage applications, with rated voltages reaching 3kV, 5kV, 10kV, or even higher. It also uses a tinned copper conductor, but its insulation is generally thicker and made from specially formulated silicone rubber, offering stronger dielectric strength and electrical insulation. Its operating temperature range is also -60℃ to +200℃, allowing stable operation under high-temperature conditions.
While UL3239 is less flexible than UL3135, its insulation protection is much stronger, making it widely used in high-voltage applications. For example, it is commonly applied in high-voltage ignition lines in televisions, power systems in laser printers, high-voltage modules in air purifiers, and industrial high-voltage power equipment.
As an example, in an ozone generator that requires stable high-voltage output, UL3239 is the ideal choice. It can handle both high temperature and high voltage, ensuring the safety and stability of the electrical circuit.
Key Differences Between UL3135 and UL3239
Although both are high-temperature silicone wires, there are clear differences in structure, performance, and application:
| Feature | UL3135 | UL3239 |
|---|---|---|
| Rated Temperature | -60℃ to +200℃ | -60℃ to +200℃ |
| Rated Voltage | 600V | 3kV / 5kV / 10kV or higher |
| Conductor Material | Finely stranded tinned copper | Tinned copper |
| Insulation | Silicone rubber | Special silicone rubber, thicker insulation |
| Flexibility | Excellent – ideal for dynamic wiring | Moderate – primarily for fixed high-voltage applications |
| Typical Applications | Industrial equipment, appliances, lighting, control systems | High-voltage power supply, TVs, laser printers, ozone generators |
From the table, it is clear that UL3135 emphasizes flexibility and suitability for medium-voltage environments, while UL3239 focuses on insulation protection for high-voltage applications.
Practical Applications of UL3135 Cable
UL3135 is ideal for environments requiring flexible wiring and long-term heat resistance:
Industrial motors and equipment: Maintains long-term stability under vibration and high temperature.
Household appliances: Used inside rice cookers, ovens, and water heaters to ensure safe operation.
Lighting devices: Heat resistance and flame retardancy make it suitable for lamps and control boxes.
Electronic control systems: Flexible wiring simplifies installation and maintenance, improving overall efficiency.
For example, in an automated production line, the control system may require numerous wires routed through confined spaces. UL3135's flexibility allows efficient installation and easier future maintenance.
Practical Applications of UL3239 Cable
UL3239's high-voltage insulation makes it the preferred choice for high-voltage devices:
Televisions and displays: Used in internal high-voltage ignition lines.
Laser printers: Provides reliable electrical protection in high-voltage electrostatic development systems.
Air purifiers and ozone generators: Ensures stable voltage delivery in high-voltage modules.
Industrial power systems: Common in high-voltage generators and testing equipment.
In these applications, UL3239 must withstand both high temperature and high voltage. Its thicker insulation effectively prevents dielectric breakdown, protecting both equipment and personnel.
Comprehensive Summary of UL3135 and UL3239
In summary, UL3135 and UL3239 each have their strengths. UL3135 is more suitable for medium-voltage applications that require high flexibility, while UL3239 is the best choice for high-voltage applications. Both offer excellent high-temperature resistance, but UL3135 excels in flexible wiring and complex installations, whereas UL3239 provides superior insulation and high-voltage protection.
When selecting a wire, engineers should consider voltage rating, installation method, spatial layout, and equipment characteristics. For example, complex control cabinet wiring favors UL3135, while ozone generators or laser devices require UL3239.
Why Choose Dongguan Greater Wire & Cable Co., Ltd.
As a professional high-temperature wire manufacturer, Dongguan Greater Wire & Cable Co., Ltd. has extensive experience and mature production processes for UL3135, UL3239, and other silicone wires. We have advanced production facilities and strict quality inspection procedures, ensuring every spool meets international safety standards.
The company offers standard models and can customize wire specifications according to customer requirements, including conductor size, insulation thickness, temperature rating, and packaging. We focus on product stability and reliability while providing comprehensive after-sales support to help clients address any practical application issues.
Whether you are a household appliance manufacturer, industrial equipment supplier, or high-voltage power system integrator, we provide the most suitable wire solutions, helping your products stand out in the market.
Contact Us
Tel/WhatsApp/WeChat: +86 135 1078 4550 / +86 136 6257 9592
Email: manager01@greaterwire.com
Choose Dongguan Greater Wire & Cable Co., Ltd. for safer, more efficient, and reliable high-temperature wire applications!