Views: 0 Author: Site Editor Publish Time: 2025-05-06 Origin: Site
Vetronite material is a high-performance glass-fiber-reinforced epoxy laminate celebrated for its outstanding mechanical strength, dielectric insulation, thermal stability, and flame-retardant behavior. Widely available in grades such as G-10, G-11, FR-4, FR-5, and specialized variants like antistatic or polyimide-bonded types, Vetronite serves as the substrate of choice for printed circuit boards (PCBs), electrical insulation in motors and transformers, precision machined parts, and structural components across electronics, automotive, aerospace, and industrial sectors. Its customizable thicknesses, predictable electrical characteristics, and conformity with international standards make it an enduring cornerstone of modern engineering.
Vetronite laminates are produced by layering glass-fiber fabrics that have been impregnated with an epoxy resin matrix and curing them under controlled heat and high pressure to form rigid, dense sheets or bespoke shapes.
The glass cloth plies are oriented orthogonally (warp and fill directions) to maximize in-plane mechanical stiffness and reduce anisotropy.
For flame-retardant grades (FR-4, FR-5), the resin formulation incorporates brominated or other halogen-free additives to achieve UL 94 V-0 self-extinguishing performance.
Sheets are commonly furnished in standard sizes (e.g., 1020 × 2040 mm) with thickness ranges from 0.2 mm to over 50 mm, and may also be machined into tubes, rods, gaskets, or complex parts per drawing specifications.
Flexural Strength: Exceeds 400 MPa along the principal fiber direction, ensuring resistance to bending and load-bearing applications.
Young’s Modulus: Approximately 70 GPa in-plane, delivering high stiffness for structural uses.
Density: Around 1.85 g/cm³, balancing durability with lightweight design.
Dielectric Strength: ≥ 20 MV/m, providing robust insulation even under high voltage stresses.
Relative Permittivity (εᵣ): ≈ 4.4 at 1 MHz, ensuring stable signal transmission in high-speed electronics.
Dissipation Factor (tan δ): 0.017–0.03, indicating low dielectric losses for RF and digital circuitry.
Glass Transition Temperature (Tg): ≥ 130 °C for standard grades; high-TG variants reach up to 180 °C for continuous use in demanding environments.
Thermal Conductivity: ~ 0.3 W/m·K through-thickness, ~ 0.8 W/m·K in-plane, aiding heat dissipation in power electronics.
Flame Rating: UL 94 V-0 compliant for FR grades, meeting NEMA LI-1 self-extinguishing standards.
| Grade | Resin System | Temperature Class | Key Feature |
| G-10 | Non-halogenated epoxy | B (130 °C) | Standard strength & insulation |
| G-11 | High-temp epoxy | F (155 °C), H (180 °C) | Enhanced thermal endurance |
| FR-4 | Brominated epoxy | B (130 °C) | Flame-retardant, PCB substrate standard |
| FR-5 | High-temp, halogen-free epoxy | H (180 °C) | Halogen-free flame resistance |
| EGS 619 AS | Epoxy with antistatic additive | B (130 °C) | Dissipative surface for sensitive electronics |
| Polyimide 64160 | Polyimide resin | H (180 °C) | Ultra-high temp performance |
As the backbone of single-, double-, and multi-layer PCBs, Vetronite FR-4 offers dimensional stability, low moisture uptake, and predictable dielectric behavior essential for high-density interconnects and signal integrity.
In transformers, motors, generators, and switchgear, Vetronite’s low water absorption and high dielectric strength provide reliable insulation barriers that endure thermal cycling and electrical stresses.
Gaskets, bearings, spacers, and structural inserts benefit from Vetronite’s machinability, wear resistance, and ability to maintain tight tolerances in electromechanical assemblies.
High-temperature variants (G-11, FR-5, polyimide grades) are employed in avionics, electric vehicle control units, battery housings, and other critical applications demanding flame safety and dimensional stability under extreme conditions.
Antistatic (EGS 619 AS), conductive, silicone (G-7), and melamine-bonded variants extend Vetronite’s scope to applications such as coil insulation with corona protection, high-temperature seals, and die-cut components.
Vetronite material can be drilled, milled, water-jet cut, and turned with standard tooling, though feed rates and tool geometry should be optimized to prevent delamination and edge fraying. Workpiece fixturing is critical to maintain flatness, and coolant use can extend tool life and improve surface finish.
