Definition of 3-in-1 conformal coating:

　　Three-proofing coating is a protective varnish used on the circuit boards of various electronic devices. Once cured, it effectively safeguards against moisture, corrosion, and salt spray.

　　Reasons for choosing to use 3D protective coatings:

　　The product will be exposed to significant moisture in its operating environment. Excessive moisture can severely reduce the insulation resistance between conductors, accelerate high-speed degradation, lower the Q value, and even cause corrosion of the conductors. Three-proof adhesive (or coating), also known as moisture-resistant adhesive (or coating), is specifically designed to protect against such conditions.

　　Development of 3-in-1 Coatings:

　　Initially, conformal coatings were used exclusively on printed circuit boards in high-tech military and defense applications. In fact, these coatings can now be found on many PCBs—critical components that are vulnerable to moisture intrusion, which can lead to electronic degradation, conductor corrosion, and even irreparable short circuits. Contaminants in these electrical systems include residual chemicals from the manufacturing process, solvents, mold-release agents, metal particles, marking inks, and more. They also encompass contaminants caused by human negligence, such as body oils, fingerprints, cosmetics, and food residues. Additionally, the operational environment itself introduces a host of other pollutants, including salt spray, sand, fuel, acids, corrosive vapors, and even mold growth.

　　The purpose of applying three-proof paint:

　　To reduce costly maintenance and upkeep, as well as lower product costs, a thin film is applied to the surface of the circuit board to protect against moisture, salt spray, and corrosion. This step enhances product quality, extends service life, and ensures reliable safety performance. Notably, this coating serves as the precursor to the "three-proof" adhesive (paint).

　　Can three-proofing coating be applied to the device surface to make it waterproof?

　　The material is metal, offering primary protection against moisture, water, corrosion, and salt spray. Since the equipment lacks an external casing, and the conformal coating cannot withstand significant levels of water or air pollution, it’s not suitable for applying conformal coating directly onto the device’s surface. Instead, a specialized coating designed specifically for such surfaces can be used—this alternative ensures long-term resistance to air pollution, humidity, and dampness, preventing the rapid degradation of the conformal coating’s protective properties.

　　Three-proofing coatings are typically applied to the surface of a product’s external circuit board. While the enclosure shields most contaminants, only a small portion of the circuit board remains exposed to potential pollution. In this scenario, the three-proofing coating serves as a protective barrier. Its primary functions include safeguarding the circuit board against moisture, corrosion, and salt spray. For everyday household appliances and consumer electronics, the nano-series three-proofing coatings are an excellent choice for application on standard electronic device motherboards. These coatings deliver outstanding protection at a competitive price, helping to enhance product quality while also providing cost-effective control over the coating process.

　　For large electronic products, the surrounding environment is often humid and harsh. Acrylic conformal coatings are a suitable choice here, as they have high viscosity and excellent moisture resistance. However, for electronics used in marine or offshore applications—where salt spray and humidity are particularly severe—standard conformal coatings simply can’t withstand the conditions. In such cases, silicone-based conformal coatings are the better option. These organic silicon conformal coatings effectively protect electronic boards from damage caused by even the most severe forms of contamination. While they come at a higher price compared to conventional coatings, they’re ideal for military-grade products or exports where quality standards are exceptionally stringent.