Fluxless/Formic Reflow Ovens 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 […]