In terms of insulating varnish, Water-based Enamelled Winding Wire Insulating Coating Although there haven’t been any completely new upgrades, technological advancements in improving and enhancing existing varieties have continued unabated. Several improved variants are steadily replacing older models, leading to enhanced performance in enameled wires. In fact, some products have even introduced innovative trends like anti-corona coatings, which significantly boost the reliability of enameled wires. Meanwhile, the widespread adoption of self-lubricating enamels has further expanded the versatility of these wires.

　　Some of the improvements are purely the result of advancements in enameled wire technology. For instance, ongoing research into small-flat-wire technology has led to the development of water-based enamel-coated winding wire with enhanced flexibility, enabling new machinery to be created for certain older products. Additionally, polyimide has recently regained attention and has evolved into a high-solids-content product that remains stable at room temperature.

　　The exploration of entirely new varnish coatings for enameled wires and their application methods is ongoing. There are always companies, investors, and technicians tirelessly pursuing innovation.

　　Domestic Development Trends in Water-Based Insulating Coatings for Painted Winding Wire Development trends in domestic winding wire products:

　　Consumption of low-heat-level products rated at 155 and above has gradually declined—eventually leading to their phase-out—while demand for high-heat-level products rated at 180 and above has seen a significant surge. The 130-grade polyurethane is set to be phased out, as production of the 155-grade reaches its peak, whereas the 180-grade, already widely adopted, continues to grow substantially. Meanwhile, the 200-grade product has already proven its effectiveness. Additionally, to meet stringent environmental protection standards, direct-welded polyester imide is beginning to replace polyurethane in this application.

　　Production of Polyester Grade 130 has significantly decreased and is ultimately set to be phased out. Meanwhile, Grade 155 currently dominates production volumes. However, the cost of Grade 180 coating materials is inevitably dropping, leading to its gradual replacement—especially for larger wire gauges exceeding 0.8mm, where Grade 155 has already been superseded by domestically produced Grade 180 coatings. On the other hand, Grade 200 polyester is widely used as the base layer in composite structures.

　　Polyimide polyester grade 155 has been phased out, while grade 180 has become the primary product for coated wires and is set to replace the 155-grade polyester, securing a major share of the coated wire market. Production of direct-welded polyimide polyester will also increase.

　　As a versatile enameled wire, the 200-grade polyester or polyester-imide composite polyamide-imide boasts an even broader range of applications. Production in Europe and the U.S. accounts for approximately 60% of this product, while China holds only a 30% share. As the cost of coating materials decreases and demands for product reliability continue to rise, the vast majority of existing polyester and polyester-imide products are expected to be gradually replaced by this advanced option.

　　Production of both 220-grade and 240-grade polyimide products will increase significantly, as China’s automotive, rail transit, energy, mining, and smart manufacturing sectors continue to grow rapidly—currently accounting for less than 0.5% of total output.