Heller has designed and built a production ready horizontal Flux-Free Formic Reflow oven for formic acid vapor soldering. This new oven has been designed to meet Semi S2/S8 safety standards (including toxic gases).
Our Formic Reflow Process. These formic reflow ovens operate like a normal reflow oven with the addition of formic acid vapor injection into key thermal zones (typically soak zones). Here the formic acid removes any oxides on the metal prior to reflow. Formic levels are maintained by a bubbler system and monitored in real time.
Formic Acid Precision Bubbler Cabinet. Our formic acid reflow ovens use a bubbler system to provide stable and consistent formic concentrations in the process chamber
- Designed to provide consistent, reliable formic acid vapor concentration to within 0.5%, ensuring a stable process.
- Formic acid vapor concentration saturates nitrogen according to Antoine equation for a given temperature. Formic acid vapor concentration in the oven can be varied by bubbler temperature and nitrogen flow through bubbler
- Auto refill system ensures bubbler never drops below minimum level
Bubbler Cabinet
Heller Formic Gate. We have developed the formic gate system, which serves to dramatically reduce process gas consumption. Formic gate acts as sets of double doors placed at the oven’s entrance and exit. During production, only one door ever opens at a time when a product is entering or exit the machine. This isolates the process chamber from the outside, and lowers Nitrogen and formic acid consumption.
