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Transformer Phenolic Resin Paper Tube is a high-performance insulating material widely used in electrical equipment such as transformers. It provides reliable insulation, mechanical protection, and excellent thermal stability, ensuring the long-term safe operation of power systems.

Transformer insulation materials play a vital role in ensuring the reliability and service life of transformers. Their performance directly affects the operational stability, efficiency, and durability of the equipment. With the rapid advancement of science and technology, transformers and other electrical equipment such as motors are widely used in various industries, and insulating materials have become an essential focus for transformer design and manufacturing engineers.

The EPGC series epoxy laminate sheets are high-performance insulation materials widely used in the mechanical, electrical, and electronic industries. These products are manufactured according to IEC60893-3-1:2003 and GB standards, ensuring reliable quality and stable performance under demanding conditions.

In the electronics industry, Epoxy FR4 Yellow Sheets and Green FR4 Sheets are two terms often mentioned together. Many engineers and buyers wonder: Are they different materials, or just different colors?

When discussing transformer performance, most attention is usually given to electrical efficiency, thermal management, and insulation design. However, one often overlooked factor is mechanical strength. Transformers in operation are constantly exposed to electromagnetic forces, vibrations, and thermal stresses. Under extreme conditions such as short circuits, these stresses become even more severe. Without strong mechanical support, even a slight winding displacement may cause insulation breakdown and serious faults.

In the electronic materials industry, epoxy sheets are widely recognized as essential insulation materials for electrical and electronic equipment. Among them, 3240 epoxy sheets and FR-4 fiberglass sheets are two commonly used grades. Although both belong to the epoxy board family, they differ significantly in composition, properties, and application areas.

When engineers select insulating materials for high-voltage electrical equipment, the first reference points are usually the performance values listed on the technical data sheet—dielectric strength, arc resistance, mechanical strength. Yet, the true reason behind the long-standing trust in the GPO-3 insulation board (GPO-3 insulation sheet) lies not only in these numbers but in its exceptional stability and isotropic performance under real-world operating conditions.

When it comes to choosing the right insulation material for electrical and industrial applications, the decision directly impacts performance, durability, and cost-effectiveness. Among the most widely used options are SMC (Sheet Molding Compound) Insulation Board, GPO-3 (Glass Polyester Laminate), and FRP (Fiberglass Reinforced Plastic). Each of these materials has distinct features and benefits, making them suitable for different application scenarios.

The 3240 Epoxy Sheet is a high-performance insulating material widely recognized for its reliability in demanding electrical, electronic, motor, and mechanical applications. Manufactured from non-alkali fiberglass cloth impregnated with epoxy resin and phenolic resin, and processed through precision heat and hot pressing, this material delivers an excellent balance of dielectric strength, mechanical durability, and environmental resistance.

GPO-3, also named UPGM-3 is a high-performance, fiberglass-reinforced thermoset polyester laminate widely used in electrical and industrial applications. Its excellent arc resistance, flame retardancy, and mechanical strength make it ideal for high-voltage systems, including busbar insulation, switchgear housings, and other critical electrical components. GPO-3 is available in sheets, rods, and custom laminates, offering reliable electrical insulation and dimensional stability under stress.