FOC Copper Foil Oil Capacitor

II. Core Technical Specifications

III. In-depth Analysis of Core Processes

3.1 Electrodes: The Electrical Advantages of Pure Copper Foil

Electrodes: The resistivity of copper is approximately 1.68 × 10_  ⁸ Ω·m, which is only 58% of   that of aluminum (2.65 × 10_  ⁸ Ω·m). This means that, for identical geometric dimensions, the equivalent series resistance (ESR) of a copper foil electrode is nearly 40% lower than t hat of an aluminum foil electrode.

Enhanced High-Frequency Extension: Low ESR indicates that the impedance rise of the capacitor at high frequencies is smoother, resulting in less signal attenuation above 10kHz. This manifests as enhanced airiness and more complete harmonic overtones.

Faster Transient Response: ESR is directly related to charging/discharging speed; low ESR enables rapid response to abrupt transients (e.g., percussion or piano strikes), resulting in a more vivid sound.

Reduced Heating: The joule heat generated by ESR is proportional to the square of the current; in high-power frequency dividers, low ESR results in lower temperature rise, ensuring parameter

stability.

3.2 Dielectric Material: Advanced Film Technology

Dielectric Material: Features corona treatment and infrared hole screening to prevent arc breakdown. Bevenbi employs a transverse plus longitudinal uniform tensioning process.

Resistance to Dynamic Current: Acts as an insulating current isolation zone against voltage spikes; significantly lower failure rate compared to conventional foil capacitors when

confronted with circuit abnormalities.

High Thermal Dissipation: Large contact area and rapid flow of positive/negative electrons mean this product heats up more slowly than conventional metallized film products.

3.3 Oil Immersion Process

The quality of the high-purity special insulating oil directly determines long-term stability and acoustic performance.

The oil Bevenbi applies takes technical features as below:

High Dielectric Strength: >30 kV/mm, ensuring voltage withstand redundancy.

Extreme Stability: Maintains fluidity across -40℃ to +100℃, ensuring full wetting throughout the range.

Extremely low dielectric loss: no additional increase in the capacitance DF value;

Chemically Inert: No corrosive reaction with membranes or electrodes; vacuum impregnation ensures oil penetrates every microscopic gap and eliminates corona discharge.

IV. Parameter Comparison & Data Analysis

Data Analysis: Bevenbi copper foil oil-immersed capacitors meet stricter requirements than international standards across key DF metrics, with their insulation resistance values

significantly exceeding industry benchmarks—this is attributable to rigorous process control, which results in lower leakage currents and a reduced impact on the DC bias of downstream circuits in coupled applications, thereby ensuring a cleaner signal path. Regarding pricing, Bevenbi occupies a reasonable position between domestic and imported products—its performance aligns with the highest international standards, while its price falls within the mid-range spectrum. This represents not merely a “budget friendly alternative,” but a rational choice of “equivalent yet superior” performance.

V. Application Scenarios and Technical Recommendations

5.1 Typical Applications

5.2 Selection Considerations

Voltage rating selection: It is recommended that the rated voltage be 1.5–2 times the circuit operating voltage, providing sufficient margin.

Pairing requirements: For stereo channels, it is recommended to use products from the same batch or to select a ±3% high-precision pairing option.

Installation Direction: Although oil-immersed capacitors are non-polar, it is recommended that the external labels face in the same direction to facilitate subsequent maintenance and identification.