Let me tell you all about insulating varnish. All-in-One Water ) Viscosity and key storage tips:

　　What is the viscosity of insulating varnish (fanlisi)?

　　Insulating varnish (Fanli Shui) can be applied to various printed circuit boards to form a fully transparent original film, providing reliable and effective protection against environmental hazards such as internal moisture, corrosion, dust, and vibration—issues that often lead to corrosion, mold growth, static electricity, short-circuit failures, and even circuit damage.

　　Insulating Varnish (Fanlisi) Application Categories:

　　1. Civilian Electronics and Electrical Products Line

　　Automatic washing machines, sink dishwashers, shower systems, air conditioners, outdoor display screens, anti-theft locks, security devices, induction cooktops, and more.

　　2. Diagnostic and treatment equipment, laboratory instruments

　　Various diagnostic and experimental instrument panels, such as high-precision LCR testers, constant temperature and humidity chambers, and more.

　　3. Aerospace, marine vessels, and other related control systems

　　Coating viscosity is a critical factor determining permeability, especially when superheated steam penetrates the material. Insulating varnish (Varnish Water), in particular, tends to become more viscous as temperature rises. Typically, the viscosity specification for insulating varnish (Varnish Water) in industry standards is set at 20°C. However, the "reasonable viscosity" refers to the specific viscosity value obtained by heating the material—under the pre-impregnation temperature standard—to the temperature required by the processing technology guidelines during operation. This precise viscosity can be determined by consulting the corresponding viscosity-temperature curve.

　　Solvent-based coatings can have their viscosity adjusted using appropriate solvents, depending on the evaporation rate during the drying process. In contrast, solvent-free coatings rely on specialized coating thinners that are designed to maintain consistent reflectivity throughout the entire drying and curing process—requiring careful preparation—and cannot be used to adjust viscosity. Solvent-free insulating varnishes (also known as "fanli shui") can only be adjusted by adding more of the same insulating varnish ("fanli shui").

　　Since the solvent in the varnish will evaporate during the drying process, exploring the properties of the solvent and carefully selecting the drying method—as well as determining the appropriate heating rate and implementing essential, reliable preventive measures—is a critical issue.

　　What should be kept in mind when storing and using insulating varnish (fanlishui)?

　　Most specialized paint thinners for insulating varnishes (fanlishui) are made of styrene, as styrene tends to undergo auto-polymerization during storage and use—or even copolymerize with unsaturated aliphatic polyesters present in the paint—leading to gelation. To prevent these issues, edge-sealing paints must be stored in ultra-low temperature environments (below 25°C) or in freezer warehouses. Additionally, they should never be exposed to open flames or direct sunlight. Regular viscosity checks are also essential; it’s recommended to monitor viscosity changes monthly. If rapid increases in viscosity are detected, an appropriate amount of polymerization inhibitor like hydroquinone should be added promptly, and the paint should be used up within a short period. In cases where product performance is compromised or gelation occurs, resulting in costly disposal fees, users are advised to thoroughly clean the paint tank annually at the start of each new year, replacing the old paint entirely. Then, in the following month, adding 10% fresh paint can help extend the lifespan of the coating significantly.

　　That's all for our introduction to insulating varnish (Fanli Shui). Thanks for watching—see you again next time!