In industrial power supplies, LED drivers, communication base stations, and other outdoor equipment, we often see switching power supplies that are completely "potted"—the entire circuit board is completely encased in a layer of transparent or gray resin. This seemingly ordinary resin is actually the "invisible armor" of the switching power supply, providing five core functions to ensure its long-term stable operation in harsh environments. I. Waterproof and Moisture-proof – "Invisible Waterproof Casing"The primary function of potting is waterproofing and moisture protection. The potting compound (mostly silicone or epoxy resin) forms a dense, non-porous barrier after curing, effectively blocking water, salt spray, acids, alkalis, and other corrosive media. This allows the power supply to operate reliably in high-humidity, outdoor, and salt-spray environments (I...