Electrical resistance is the reciprocal of conductance, and resistivity refers to the resistance per unit volume of a material. The lower the conductivity of a material, the higher its resistance. For Electrical Insulation Materials, higher resistivity is always preferred. A higher resistivity indicates better insulation performance and lower leakage current under electrical stress.
Electrical Insulation Materials are mainly used for two purposes: electrical isolation between components in power systems, and dielectric media in capacitors for energy storage.
For electrical isolation applications, a lower relative permittivity is preferred to reduce capacitance effects. For capacitor applications, a higher relative permittivity is desired to improve energy storage capability. However, in both cases, a low dielectric loss tangent (tan δ) is essential.
Especially in high-frequency and high-voltage applications, materials with low dielectric loss are required to minimize energy dissipation and heat generation.
When an Electrical Insulation Material is subjected to a sufficiently strong electric field, it loses its insulating properties and becomes conductive. This phenomenon is called electrical breakdown. The voltage at which breakdown occurs is known as breakdown voltage.
Dielectric strength refers to the breakdown voltage per unit thickness of the material under specified test conditions, i.e., the voltage that a material can withstand per unit thickness before breakdown occurs. For Electrical Insulation Materials, higher breakdown voltage and higher dielectric strength are always preferred, indicating better resistance to electrical failure.
Tensile strength is the maximum tensile stress a material can withstand during a tensile test before failure. It is one of the most widely used indicators for evaluating the mechanical performance of Electrical Insulation Materials and reflects their resistance to pulling forces and structural integrity.
Flame resistance refers to the ability of an insulating material to resist ignition when exposed to a flame and to prevent continued burning once the flame source is removed.
As the application range of Electrical Insulation Materials continues to expand, flame retardancy has become increasingly important. Higher flame resistance means improved operational safety and reduced fire risk.
Arc resistance refers to the ability of an insulating material to withstand the воздейств of an electric arc along its surface under specified test conditions.
In testing, an alternating high voltage with low current is applied to generate an arc between two electrodes. The time required for the material surface to form a conductive path is used to evaluate its arc resistance. A longer time indicates better arc resistance performance.
Sealing performance refers to the material’s ability to provide effective isolation against oil and water penetration.
Good sealing performance ensures stable operation in environments involving transformer oil, moisture, or other insulating fluids, preventing degradation of electrical and mechanical properties over time.
YILONG specializes in high-performance Electrical Insulation Materials and CNC machined insulation components, providing stable quality epoxy laminates, FR4, G10/G11, and phenolic materials for electrical, electronic, and industrial applications worldwide.
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Electrical resistance is the reciprocal of conductance, and resistivity refers to the resistance per unit volume of a material. The lower the conductivity of a material, the higher its resistance. For Electrical Insulation Materials, higher resistivity is always preferred. A higher resistivity indicates better insulation performance and lower leakage current under electrical stress.
If you're struggling to choose among various electrical insulation materials, this guide compares five commonly used laminated insulation sheets: 3240 epoxy sheet, FR4 Fiberglass Sheet, Bakelite Sheet, Phenolic Cotton Cloth Laminate, and Phenolic paper laminate, helping you quickly identify the most suitable material for your application.
Is your microwave oven suddenly failing to work? Are high-temperature industrial machines experiencing frequent breakdowns? In many cases, the problem may be traced back to a critical component—the mica board.
In today’s electronic era, electronic products are deeply integrated into our daily lives and are evolving at a rapid pace. It is difficult to imagine modern life without them. Epoxy glass sheets are a key insulating material widely used in electronic products. There are many types, including FR-4 Epoxy Glass Sheet, 3240 Epoxy Sheet, G11 Epoxy Glass Sheet, and G10 Epoxy Glass Sheet, each designed to meet different application requirements. Among them, G11 Epoxy Glass Sheet is considered one of the higher-performance materials, and it is important to understand its characteristics before use.
YILONG provides high-quality epoxy glass laminates widely used as engineering insulation materials. Among them, G10 Epoxy Glass Sheet and G11 are two commonly referenced grades in electrical and industrial applications. Although they share similar base structures, their performance and working environments differ due to material composition and manufacturing variations.
Material selection in engineering and manufacturing plays an important role in product performance and service life. Epoxy glass sheets have become a preferred material in many applications due to their excellent electrical insulation and mechanical properties. In particular, the G10 Epoxy Glass Sheet stands out in high-performance applications thanks to its outstanding durability and reliability.
Phenolic Cotton Laminate is a widely used thermoset composite material manufactured by impregnating cotton fabric with phenolic resin and curing under controlled heat and pressure. It is designed to deliver reliable mechanical strength, electrical insulation performance, and machining stability for industrial environments requiring durable structural materials.
Phenolic Cotton Board (also known as phenolic cotton laminate in sheet and rod forms) is a widely used engineering material valued for its balanced mechanical strength, electrical insulation, and thermal stability. Below is a structured and professional overview of its key properties and applications.
NEMA LE Phenolic Cotton Laminate is a high-performance thermoset insulation material manufactured from fine linen or cotton fabric reinforced with phenolic resin under controlled heat and pressure. It is designed to provide improved electrical properties, stable mechanical strength, and excellent machinability for precision industrial applications.
NEMA L Cotton Phenolic Board is a widely used thermoset laminate designed for electrical insulation and structural support in industrial environments. It is manufactured from multiple layers of cotton fabric impregnated with phenolic resin under high pressure and temperature, forming a dense composite material with stable mechanical and electrical properties.
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