FR-4 PCB

FR-4 PCB

What is FR-4 PCB?

FR-4 PCB is a type of printed circuit board widely used in the electronics industry. FR-4 refers to Flame Retardant (Flame Retardant) Class 4 material, which consists of glass fibers and epoxy resin, and is considered to be the standard substrate material in circuit board manufacturing.

FR-4 PCB

FR-4 material is made of glass fiber cloth and epoxy resin composite, with high strength, high rigidity and flame retardant. Among them, the glass fiber cloth is responsible for enhancing the mechanical strength and stability of the circuit board, and the epoxy resin provides good insulation properties and high temperature resistance. Its strength, stability and supply chain maturity make it one of the most widely used materials in PCB manufacturing.

FR-4 PCB

The most obvious difference between FR-4 materials is the Tg value, according to the Tg temperature, FR-4 plates are generally divided into low Tg, medium Tg and high Tg plates.In the industry, FR-4 Tg of about 135℃ is usually classified as low Tg sheet; The FR-4 of Tg at about 150℃ is medium Tg plate; FR-4 Tg at about 170℃ is classified as high Tg plate.If the PCB is processed with more times of pressing, or more PCB layers (more than 14 layers), or the welding temperature is high (≥230 ° C), or the working temperature is high (more than 100 ° C), or the welding thermal stress is large (such as wave welding), high Tg plate should be selected.

LHD Technology FR-4 Production Capacity

Processing layers 1-48 layers
Finished board thickness (thinnest - thickest) 0.008″ ~ 0.24″ (0.20mm ~ 6.0mm)
Minimum Hole Diameter 6mil (0.15mm)
Minimum line width/spacing 3-4 mil (0.076-0.10mm)
Maximum board size Single and double layer 22″x 43″ (550 x 1100mm) Multilayer 22″x 25″ (550mm x 640mm)
Impedance control ± 10%
Surface treatment process oxidation resistant OSP, tin spraying, electric nickel/gold, chemical nickel/gold, lead-free tin spraying, gold finger, immersion silver, immersion tin, thick nickel/gold.
Processing materials FR4 (Sangyi, KB, International), high TG (TG150, TG170), halogen-free plates, high-frequency plates (Rogers, Teflon, Taconic), domestic PTFE (F4B, F4BK),, aluminum substrate (Berquist, domestic Al-based), copper-based, iron-based, ceramic substrate.

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