F4BM-2-A: An Upgraded Version of the F4BM Series
Introduction to F4BM-2-A
F4BM-2-A is an enhanced iteration within the F4BM series, distinguished by its superior electrical performance and stability in surface insulation resistance. It is constructed through a sophisticated process involving imported varnished glass cloth, Nano-ceramic membrane, and Teflon PCB resin, adhering to stringent technological standards.
Technical Specifications of F4BM-2-A
Appearance and Types
F4BM-2-A meets national and military standards for microwave PCB laminates. It comes in various types including F4BM-2-A255, F4BM-2-A262, F4BM-2-A275, F4BM-2-A285, F4BM-2-A294, and F4BM-2-A300.
Dimensions
Available dimensions range from 550440mm to 15001000mm. Custom sizes are also available upon request.
Thickness and Tolerance
Laminate thicknesses vary from 0.254mm to 12.0mm, with specific tolerances ranging from ±0.025mm to ±0.2mm depending on the thickness.
Mechanical Strength
- Cutting/Punching Strength: Depending on thickness, there are no burrs after cutting, and the minimum space between punching holes varies to prevent delamination.
- Peel Strength: For a 1oz copper layer, normal state peel strength is ≥16N/cm; under constant humidity and temperature conditions, it is ≥12N/cm.
Chemical Properties
The material allows for chemical etching without altering dielectric properties. Through-hole plating is possible but requires sodium or plasma treatment.
Electrical Properties
- Density: Ranges from 2.1 to 2.35 g/cm³ under normal conditions.
- Moisture Absorption: Less than or equal to 0.07% after 24 hours in distilled water at 20±2°C.
- Operating Temperature: From -50°C to +260°C.
- Thermal Conductivity: Between 0.45~0.55 W/m/k.
- Coefficient of Thermal Expansion (CTE): Varies with temperature and dielectric constant values.
- Shrinkage Factor: Less than or equal to 0.0002% after 2 hours in boiling water.
- Surface and Volume Resistivity: High resistivity under normal and constant humidity/temperature conditions.
- Dielectric Constant and Dissipation Factor: Stable across a range of frequencies with low dissipation factors.
Flammability Rating
UL Flammability Rating: 94V-0.
Conclusion
F4BM-2-A represents a significant advancement in the F4BM series, offering improved electrical performance and mechanical stability, making it suitable for high-frequency applications where reliability and performance are paramount.