PCB on UV Curing Star

Gallium iodide lamp for PCB factory

Sat, 25 Jul 2026 07:47:08 +0800

Getting Your PCB Curing Right with Gallium Iodide UV Lamps

If you’re working with PCB fabrication, you know the struggle of getting the photoresist just right. Standard mercury lamps can be a bit blunt—they often over-cure the substrate, which is a headache nobody needs. That’s where Gallium iodide lamps come in. They hit a very specific UV wavelength. Instead of blasting the board with everything, they target exactly what the resist needs to harden quickly without messing up the rest of the board.

Gallium iodide lamp for PCB factory

Wed, 22 Jul 2026 07:21:07 +0800

Why We Switched to Gallium Iodide for PCB Lines

We spent some time auditing about 3,000 printing and PCB shops, and we noticed something frustrating. Most people were using generic UV lamps that looked great on a spec sheet but just didn’t cut it on a high-volume line. Standard mercury lamps often miss the mark on the exact wavelength these modern photoresists need. That’s why we stopped playing it safe and moved over to Gallium Iodide (GaI) technology. It just works better.

UV gallium lamp for PCB exposure

Thu, 25 Jun 2026 11:00:48 +0800

On the PCB floor, a misaligned or under-cured solder mask doesn’t just look off—it can short a 100 µm trace. It’s not enough to simply hit a UV dose; you need the right spectrum, delivered where it matters. That’s why we built our UV gallium lamp for PCB exposure around that reality. What matters under the hood We hold a tight 365 nm peak with a narrow spectral bandwidth, matched to the photoinitiator absorption in solder mask inks. Peak irradiance stays above 1,200 mW/cm² at the arc distance used in your exposure unit, so you get the photon flux needed for fast cross-linking. Output stays stable thanks to a low-decay arc tube—we’ve run units for 5,000+ hours with under 5% irradiance drop. The reflector uses a dichroic coating to knock out IR and keep the spectrum consistent, so the energy density across the substrate stays repeatable. Why it plays in fine-line territory When traces are this fine, there’s no room for a half-cure between lines. The 365 nm output gives you deeper penetration with lower surface heat, so you get full adhesion without thermal stress or mask bridging. The payoff shows up as higher yield on HDI and rigid-flex boards, a consistent surface finish, and fewer reworks. You can run faster cycles without sacrificing cure depth, and because lamp output stays steady, exposure settings don’t drift over long production runs. A few shop-floor details Match lamp power and arc length to your exposure frame and optics. If the system is undersized, you end up chasing dose by slowing down throughput. Go ozone-free in the design, and make sure your shutter and airflow line up with the lamp’s thermal profile to avoid hot spots. And yes, confirm compatibility with your spectral radiometer and dosimetry—repeatable curing depends on disciplined measurement.