Fr4 sheet price manufacturers

Selecting the correct FR4 grade depends on the thermal and electrical requirements of your project. For standard electronics, a Tg (Glass Transition Temperature) of 130°C to 140°C is sufficient. However, for high-power or automotive applications, you must specify High-Tg FR4 (170°C-180°C) to prevent delamination under heat. Additionally, ensure the material is UL 94V-0 compliant for flame retardancy and check the CTI (Comparative Tracking Index) if the sheet will be used in high-voltage environments to prevent electrical breakdown.

The price is primarily driven by thickness tolerance (standard is +/- 0.10mm), copper foil thickness (ranging from 0.5oz to 3oz), and the quality of the epoxy resin used. Halogen-free FR4 typically commands a premium price due to environmental compliance. Buyers should also verify the dielectric constant (Dk), usually around 4.2 to 4.7, as consistency in this value is critical for signal integrity in high-frequency PCB manufacturing.

Request a technical data sheet that confirms flexural strength (typically ≥400 MPa) and water absorption rates (should be <0.10%). For structural or CNC-machined parts, the interlaminar shear strength is vital. It is highly recommended to source from suppliers on Made-in-China.com who can provide SGS or RoHS testing reports to ensure the material does not contain hazardous substances and meets mechanical benchmarks.

The biggest risks are moisture absorption during sea transit and warpage due to improper stacking. Ensure the supplier uses vacuum packaging with desiccant and reinforces wooden crates to prevent bending. Furthermore, verify that the HS Code (typically 7019 or 3921) is correctly declared to avoid customs delays or unexpected anti-dumping duties in certain regions.

Since FR4 is a commodity-linked product, prices fluctuate with copper and epoxy resin market rates. Negotiate a formula-based pricing model for long-term contracts. To reduce costs, increase the panel utilization rate by aligning your dimensions with the supplier's standard press sizes (e.g., 1020mm x 1220mm). Always request FOB pricing to maintain control over your logistics costs and insurance.

Utilize Secured Trading Services provided by platforms like Made-in-China.com to protect your payment until the goods pass a pre-shipment inspection (PSI). Never wire full payments to private accounts; always use Corporate Accounts verified by the platform. For first-time orders, insist on a third-party lab test of a random sample from the production batch to confirm the flame retardant properties match the gold sample.