50μm High-Precision RA Copper Foil

Controlled Thickness

Thickness deviation is controlled within ±1.5% across the coil width. The tighter dimensional control helps reduce localized variations during fine-line etching and other precision processing steps.

50μm Nominal Thickness

The 50μm gauge provides a relatively robust copper layer while retaining the flexibility associated with rolled-annealed copper foil.

Dynamic Flex Resistance

The uniform microcrystalline grain structure supports more than 10⁵ bending cycles in moving applications, making the foil suitable for components exposed to repeated flexing.

Clean Surface

The foil has a degreased, particle-free surface profile with Ra ≤0.4μm. This controlled surface condition supports bonding with polyimide films and photoresist materials.

High Electrical Conductivity

Electrical conductivity is specified at ≥100% IACS, helping reduce resistive losses and heat generation in high-current conductive paths.

Test methods specified on the current product page include ASTM E252 for nominal thickness, IPC-TM-650 2.4.18 for tensile strength and elongation, ASTM B193 for electrical conductivity, and direct measurement for standard width. 

Precision Rolling

Multi-high rolling mills equipped with Automatic Gauge Control (AGC) regulate foil thickness during production to maintain dimensional stability over long coil runs.

Controlled-Atmosphere Annealing

Continuous strand annealing is carried out under protective gas shielding to limit surface oxidation and control grain development.

Automated Optical Inspection

100% online surface scanning is used to identify defects such as pinholes, roller marks, and inclusions before final slitting.

Laboratory Verification

Each production lot is tested for tensile strength, elongation, and electrical resistivity according to the applicable IPC and ASTM procedures.

Flexible Printed Circuits

50μm RA copper foil can be used as conductor material in multilayer rigid-flex boards and flexible electronic circuits where electrical conductivity and repeated bending performance are required.

Lithium-Ion Batteries

The foil can serve as a current collector or flexible busbar material for prismatic and pouch battery modules.

EMI Shielding

Its conductivity and controlled thickness make it suitable for electromagnetic interference shielding components used in high-frequency communication hardware.

Medical Instrumentation

The combination of flexibility and fatigue resistance supports applications such as micro-coaxial cables and sensor leads.

CIVEN Metal can provide customized slit widths and coil configurations according to downstream equipment and processing requirements.

Slitting can be supplied down to 5mm with burr-free edges. Surface treatment options include anti-tarnish passivation and chemical bonding primers when additional surface functionality is required.

For automated unwinding equipment, the foil can be supplied on 76mm or 152mm core configurations. Engineering samples are available as A4 sheets or 10-meter trial coils together with Mill Test Certificates (MTC).

The foil is protected against moisture and surface contamination during shipment.

The inner packaging uses anti-corrosion VCI paper and vacuum-sealed moisture-barrier foil bags with active desiccants. High-density polyethylene cushioning is used to protect the coil and maintain edge integrity during transportation.

Export packaging is supplied in ISPM 15-compliant wooden crates or heavy-duty export corrugated boxes. Air freight and ocean container shipment options are available.