Al Metallized Polypropylene Films for Capacitors

Thickness of base film

Note: Other thicknesses are available upon request.

Slit width & free margins

Note: For the film with inside margin, both-side margins, and special sizes, please contact us.

◆ Product Advantages
- Pure Aluminum Metallized Coating with Stable and Reliable Electrical Performance: Single aluminum (Al) metallized polypropylene film vapor-deposits a pure aluminum metal layer on one side of high-purity BOPP base film. The aluminum coating has high electrical conductivity and good chemical stability, maintaining stable electrical performance across a wide range of voltages and frequencies — a classic foundational material for manufacturing various metallized film capacitors
- Excellent Self-Healing Performance: Pure aluminum coating can self-evaporate the fault point through thermal vaporization upon localized dielectric breakdown, restoring insulation performance and endowing capacitors with self-healing characteristics, effectively preventing local defects from expanding into catastrophic failures and improving overall capacitor reliability and service life
- BOPP Base Film with Outstanding Dielectric Performance: Biaxially oriented polypropylene (BOPP) base film features excellent dielectric constant (approximately 2.2), extremely low dielectric dissipation factor (tanδ typically below 0.0003), high insulation resistance, and high breakdown field strength, ensuring low-loss and high-efficiency capacitor operation
- Wide Operating Temperature Range: BOPP base film combined with aluminum coating maintains stable electrical film performance across a wide temperature range from -40°C to +105°C, meeting temperature specification requirements of industrial-grade and home appliance-grade capacitors
- Precisely Controlled Coating Sheet Resistance: Mature aluminum coating process precisely controls sheet resistance in the range of 2Ω/□ to 20Ω/□, meeting specific design requirements of different capacitors for coating resistance values — low sheet resistance for high-current applications, high sheet resistance for enhanced self-healing effect

◆ Key Selling Points
- High Cost-Effectiveness for Large-Scale Production: Compared to Al-Zn composite coating film, single aluminum film manufacturing processes are mature and stable with relatively lower raw material costs, particularly suitable for cost-sensitive large-volume home appliance capacitor production
- Extremely Wide Application Range Covering Mainstream Capacitor Categories: Single aluminum metallized polypropylene film is the core raw material for manufacturing various mainstream film capacitors including CBB60, CBB61, CBB65, and CBB21, with large market demand and strong universality
- Excellent Batch Consistency for Stable Factory Continuous Production: Aluminum vapor deposition process parameters are easy to control with good inter-batch consistency of coating thickness, sheet resistance, and film thickness, suitable for high-speed continuous production lines at capacitor manufacturers
- Multiple Base Film Thickness and Width Specifications: Base film thickness from 2.5μm to 20μm with width customizable to customer requirements, meeting material requirements of different capacitor winding machines and design parameters

◆ Primary Applications
- CBB60 series washing machine and pump motor capacitors
- CBB61 series fan and ventilation fan capacitors
- CBB65 series air conditioner, refrigerator, and lighting capacitors
- CBB21 series low-voltage DC filter and signal coupling capacitors
- Power compensation and power factor correction (PFC) capacitors