Both SG-3000 furnaces are built for EVA laminated glass. The difference is mainly capacity architecture: a more compact single-chamber layout versus a higher-throughput dual-chamber system.
The SG-3000-2SD suits factories that need reliable EVA lamination without oversizing the chamber line. It is a practical first EVA furnace or a dedicated cell for medium volumes.
The SG-3000-4SD is designed for higher tray throughput with a dual-chamber approach, better when EVA demand is continuous and cycle overlapping matters.