Phenolic Resin Cotton Cloth 3250 Bakelite Board Fiberglass Electric Board
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Product details
Epoxy phenolic glass cloth laminate (alias epoxy board) is a laminated insulating material made of electrician's alkali-free glass cloth impregnated with epoxy phenolic resin and hot-pressed, belonging to the technical field of insulating materials. Its sectional structure consists of 5-550 layers of alternately stacked layers of alkali-free glass cloth and resin layers, and it is suitable for insulating structural parts of electric motors and electrical equipment as well as electrician's insulating applications in humid environments and transformer oil
The material has high mechanical strength, excellent dielectric properties, cured both epoxy resin adhesion, chemical corrosion resistance. The surface of the product should be flat and smooth, without bubbles and impurities, with neatly cut edges and no delamination cracks. Performance indicators cover mechanical properties, dielectric strength, water absorption and electrical strength, with some manufacturers offering adhesive strength as an additional test item. The adjustable number of layers supports multi-specification small batch production, and is highly adaptable to processing.
Laminated Sheet Material Made of Epoxy Resin and Glass Fibre Cloth
Epoxy Glass Cloth Sheet is a composite material made of Glass Fibre Cloth as reinforcement and Epoxy Resin as adhesive. Epoxy glass cloth is a composite material made of glass fibre cloth as reinforcing material and epoxy resin as binder. It has excellent mechanical strength and dielectric properties, heat resistance class F (155°C) and significant moisture resistance. Its thickness ranges from 0.5 to 100mm, conventional size is 1000mm*2000mm, shrinkage is less than 2%, and it is suitable for the manufacture of highly insulating structural parts in mechanical and electronic equipment
By adjusting the curing temperature of the epoxy resin (0 to 180°C) and the glass fibre cloth weaving process (e.g. flat glass fibre technology), the dielectric homogeneity and impedance consistency of the sheets can be optimised.
1.Materials and Structures
The glass fibre woven cloth is used as the skeleton material, and the surface is infiltrated with epoxy resin and then laminated by high temperature and high pressure. The glass fibre cloth contains SiO₂ components, forming a mesh support structure through warp and weft weaving (weaving angle of 5-10 degrees), and the epoxy resin infiltrates the fibre gaps to form a dense adhesive layer
2022 industry information shows that the mainstream glass fibre cloth models include 106, 2116, 7628, etc., of which the dielectric constant (DK) of NE glass-type glass fibre cloth can be reduced to 4.6.
2.Performance characteristics
(1)Mechanical properties: transverse bending strength ≥ 340MPa, longitudinal tensile strength ≥ 310MPa
(2)Dielectric properties: dielectric strength ≥ 40kV/mm, volume resistivity ≥ 1 × 10¹³Ω-cm (normal conditions)
(3)Thermal performance: continuous operating temperature 155°C, short-term withstand temperature up to 180°C
(4)Moisture resistance performance: insulation resistance retention >90% after 24 hours of water immersion
3.Specification
Standard sheet thicknesses are graded to 0.1mm accuracy, with thin sheets (<1mm) used as substrates for flexible circuits and thick sheets (>3mm) used as insulating liners for electrical equipment
The dielectric constant varies significantly according to the type of glass fibre cloth: E-glass cloth has a DK value of 6.1, which is reduced to 4.8 by the flat glass fibre process.The loss rating of the boards is divided into normal (DF ≥ 0.02) and low-loss types (DF < 0.01).
4.Areas of application
(1) Electronics industry: used as FR4 substrate to manufacture multilayer printed circuit boards to support high-frequency signal transmission in 5G communication equipment
(2)Machinery manufacturing: processed into wear-resistant structural parts such as gear spacers and bearing bushings
(3)Aerospace: making anti-electromagnetic interference shielding for airborne equipment
5.Process Characteristics
The epoxy resin system can be cured by amine curing agent, and the bond strength is >15 MPa. The bonding strength of the glass fibre cloth to the resin is improved by more than 30% after the surface coupling agent treatment. The hot compression moulding pressure of the board is maintained in the range of 5-10MPa, ensuring no air bubbles remain between layers
2022 In industry practice, by optimizing the warp and weft density of the glass fibre (e.g., warp density of 7628 cloth is 60 yarns/inch), the impedance fluctuation can be controlled within ±5%.
6.Quality control
The implementation of GB/T 1303-2017 standard testing dielectric constant dispersion, requiring the same batch of panels DK value deviation <0.2. Flame retardant performance to UL94 V-0 grade
Sheet storage needs to maintain humidity <60% environment, to prevent the resin absorb water leading to the rise in dielectric loss.
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Hony Engineering Plastics Limited
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Plastics Sheet ,
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