Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
IEC 60240-1: Industrial Infrared Emitters — The Science of Matching Emission Wavelengths to Material Absorption
IR Heating Efficiency Depends on Wavelength Matching, Not Power
IEC 60240-1 specifies electric infra-red emitter characteristics for industrial heating. A common misconception: “more power equals faster heating.” In reality, IR heating efficiency depends on how well the emitter wavelength matches the target material absorption spectrum. Wrong wavelength — most power is reflected or transmitted, regardless of wattage.
| Band | Wavelength | Emitter Temp | Penetration | Typical Use |
|---|---|---|---|---|
| Short IR-A | 0.78–1.4 μm | 1,800–3,500 K | Deep, mm-scale | Thick coatings, plastic welding |
| Medium IR-B | 1.4–3.0 μm | 700–1,800 K | Moderate | Thermoforming, textile drying |
| Long IR-C | 3.0–10 μm | Below 700 K | Surface only | Paint surface drying, food warming |
Wien Displacement Law: λpeak=2,898/T (μm·K). To produce short-wave IR (~1 μm), the filament must reach ~2,900 K (incandescent colour temperature). Medium-wave (~2 μm) requires ~1,450 K. IR emitter design centers on selecting the right filament material and temperature to match the target material absorption spectrum.
The water-based coating challenge: Water has strong absorption peaks at 3 μm and 6 μm — meaning efficient drying requires medium/long-wave IR emitters. Using short-wave IR on water-based paint causes most energy to penetrate through the coating and heat the substrate — substrate overheats while the coating remains wet.
TN Lab — IR heating is spectral matching science, not power stacking.
