Knowledge

Sputtered FCCL helps you solve yield defects in chemical copper reduction processes

Topnano's Materials — Sputter-type Adhesive-less FCCL (2µm–18µm)

[Precision Customization, Say Goodbye to Copper Reduction]

Why "Copper Reduction" is Becoming Obsolete, and Topnano's is Your Best Solution

In the era of fine-pitch circuitry and high-frequency, high-speed transmission, FPC manufacturers relying on "chemical copper reduction" (micro-etching thick copper FCCL) are quietly bearing the hidden costs of low yields and high overheads.

Utilizing advanced nano-level sputtering technology and precise electroplating processes, Topnano's offers 2-Layer (adhesive-less) substrates ranging from 2µm to 18µm. Our physical deposition process achieves "precise thickness buildup," completely eliminating the four fatal defects of brutal chemical thinning:

❌ Defect 1: Large Copper Thickness Tolerance ➡️ Topnano's: Atomic-level Sputtering for Ultra-precise Impedance

Copper Reduction Pain Point: Chemical etching is inherently limited by nozzle pressure variances and chemical aging, leading to a poor Total Thickness Variation (TTV). This causes over-etching or residual copper during trace formation, severely disrupting Impedance Control for high-frequency signals.
Topnano's Sputter Advantage: We deposit the seed layer uniformly at an atomic level. Whether your spec calls for 2µm, 5µm, or 12µm, we deliver extreme thickness uniformity, ensuring high-frequency transmission impedance perfectly matches your design.

❌ Defect 2: Internal Stress Release Causing Board Deformation ➡️ Topnano's: Physical Deposition for Excellent Dimensional Stability

Copper Reduction Pain Point: Forcing thick copper to thin down via chemical etching disrupts the original stress balance between the PI film and the copper foil. This triggers severe warpage, shrinkage, and dimensional instability, significantly lowering the yield rate during multi-layer exposure and registration.
Topnano's Sputter Advantage: Our sputtering process is completely adhesive-less and free from high-temperature lamination stress. The material achieves an optimal stress balance right out of the factory, providing excellent dimensional stability ideal for large-format, high-density fine-line processes.

❌ Defect 3: Damaged Surface Roughness, Defeating Adhesion and Signal ➡️ Topnano's: Seamless Blend of Smoothness & High Peel Strength

Copper Reduction Pain Point: Micro-etching easily destroys the original precise low-roughness profiles (like VLP/HVLP). Over-smoothing causes dry films or solder masks to peel and bubble due to insufficient adhesion; conversely, uneven etching amplifies the skin effect, drastically increasing high-frequency signal loss.
Topnano's Sputter Advantage: Through proprietary plasma surface treatment and tie-layer technology, we achieve a low surface roughness (Low Rz) while maintaining exceptional Peel Strength, perfectly balancing fine-line adhesion with ultra-low signal loss.

❌ Defect 4: Massive Material Waste & Heavy Wastewater Costs ➡️ Topnano's: Tailored Thickness for Direct Cost Savings and Streamlined Operations

Copper Reduction Pain Point: Purchasing 12µm or 18µm copper only to dissolve it into chemical waste is literally "pouring money down the drain." It creates massive material waste and generates high-concentration copper wastewater, saddling your facility with heavy chemical handling, sludge disposal, and high utility overhead.
Topnano's Sputter Advantage: We provide a comprehensive range of pre-tailored thicknesses: 2µm / 3µm / 5µm / 9µm / 12µm / 18µm. By building only the exact thickness you need from the start, we help you eliminate material waste, bypass the need for micro-etching chemical lines, and dramatically slash your wastewater treatment costs.