Product Overview
Cartridge heaters place a spirally wound resistance wire inside a stainless-steel or Incoloy tube, compacted with high-purity MgO and sealed at the ends by epoxy or welding. Minimum OD is 3 mm; length is custom to hole depth; power density runs 10–30 W/cm², the standard for high-density localized heating.
When inserted into molds or hot runners, use holes with H7 tolerance and Ra0.8 finish, keeping the clearance at 0.05–0.1 mm. Too large raises thermal resistance and element temperature; too tight makes removal difficult. A layer of thermal grease before installation markedly improves transfer and life.
Lead styles include lead-wire, terminal-stud, and plug-in; high-temperature sites use fiberglass or ceramic sleeves. Hot-runner use typically pairs a K-type thermocouple with a PID controller, with the sensing point near the cavity for ±1°C accuracy.
Construction Features
- OD Φ3 – Φ30 mm, length custom to hole depth
- Power density 10 – 30 W/cm², up to 750°C
- Sheath 304 / 316L / Incoloy 800
- Lead-wire, terminal-stud, or plug-in exits
- Optional built-in K-type or J-type thermocouple
- High-density compacted MgO, insulation ≥500 MΩ
Technical Specifications
| Rated Power | 0.05 – 3 kW |
|---|---|
| Rated Voltage | 12V – 480V |
| OD | Φ3 / Φ4 / Φ6 / Φ8 / Φ10 / Φ12 / Φ16 / Φ20 mm |
| Length | 20 – 1500 mm |
| Power Density | 10 – 30 W/cm² |
| Sheath Material | 304 / 316L / Incoloy 800 |
| Max Temperature | 750°C |
| Bore Tolerance | H7, clearance 0.05 – 0.1 mm |
The table lists typical configuration ranges. Special pressure, temperature or media conditions require re-checking; final parameters are confirmed by the approved drawings and technical agreement.
Typical Applications
- Injection molds and hot runners
- Sealing and packaging machines
- 3D-printing hot ends
- Medical and analytical instruments
- Semiconductor equipment
Information Needed for Selection
- Medium name, concentration, and whether it contains particles
- Total medium volume or circulation flow rate
- Initial and target temperature
- Required heat-up time
- Vessel or pipe size and material
- Supply voltage, phases, and available capacity
- Installation environment and hazardous-area requirements
- Connection standard and mounting orientation
