On the windshield line, the sealant heater sits right after the green shade and before final inspection. If that heater lags, the PVB or SGP interlayer never hits the right flow window. You start seeing edge voids, haze, or worse—adhesion failure that only shows up after the car is long gone. We built this heater to keep the heating profile repeatable, cycle after cycle. What matters under the hood We run short-wave infrared (SWIR) quartz emitters. They deliver fast, directional heat with low thermal inertia. The heater body is shaped for glass processing: compact, shielded against stray radiation, and tuned for consistent emissivity across the sealant bead. Specs are matched to line reality—230 V or 400 V configurations, kW ratings scaled to windshield size, and standardized mounting and terminals so it drops into the tooling you already have. Temperature control is closed-loop, with even field distribution that keeps thermal stress off the glass during lamination. Here’s why it holds up on the windshield line. You need to hit interlayer flow temperature fast, hold it long enough for degassing and bonding, and never cook the glass. SWIR heats the sealant zone directly, so warm-up time drops and the process window stays stable. The payoff is fewer rejects from haze or edge seal defects and more consistent optical clarity. Energy use falls because heat is delivered on-demand, not wasted heating air or fixtures. A couple of practical notes. Because the emitters are line-of-sight, fixture alignment and working distance matter. Keep reflectors clean and make sure the sealant path stays inside the uniformity band. The heater plays nicely with most OEM presses and autofocus frames, but verify the mounting footprint and clearance before you refit. Plan for routine checks at the connector and thermal insulation points—that’s where reliability in the field is earned.