Black and Opaque Thermal Conductivity PI Film - for Heat Dissipation, Optical Shielding, and Electrical Safety

Black Thermal Conductivity Polyimide Film (PBT) - For Heat Dissipation, Light Blocking, and Electrical Safety

Product Description:

Black & Opaque Thermal Conductivity Polyimide Film (PBT) is a multifunctional thermal management material designed for applications that require effective heat dissipation, light blocking, and electrical insulation . By integrating thermally conductive fillers into a black polyimide matrix, PBT achieves enhanced thermal conductivity while maintaining excellent electrical insulation, mechanical strength, chemical resistance, and thermal stability.

Unlike transparent or amber thermally conductive PI films, PBT features a uniform deep-black & opaque appearance that effectively suppresses light transmission and minimizes reflection. This unique combination makes PBT particularly suitable for optical camera, and sensor-related electronic designs, where light leakage and thermal accumulation must be controlled simultaneously.

With a high thermal conductivity of ≥ 0.4 W/m·K, PBT enables efficient heat spreading without compromising flexibility or dielectric performance. It serves as a reliable solution for compact and high-density electronic assemblies and multifunctional thermal management applications operating under demanding conditions. 

Key Properties:

1. High thermal conductivity ≥ 0.4 W/m·K for effective heat transfer.
2. Excellent heat transfer to reduce localized thermal accumulation.
3. Uniform deep-black & opaque appearance for consistent aesthetics.
4. Superior light-blocking with low-reflectivity performance.
5. High mechanical strength and dimensional stability.
6. Exceptional dielectric strength.
7. Outstanding thermal, electrical, and chemical resistance.
8. Long-term durability under high-temperature operating conditions.
9. RoHS & REACH SVHC compliant, meeting all current EU environment mandates.
10. UL 94 V-0 , VTM-0 Certified.

Design Challenges in High-Sensing Systems: 

In high sensing systems, measurement accuracy is not determined by the sensing element alone. A critical yet often overlooked factor is the thermal interface between the sensor and the target surface.

• High Thermal Contact Resistance                                                                                                                                                        Even minor air gaps, surface roughness, or poor conformity can significantly increase thermal resistance, leading to measurement errors and delayed signal response.

• Slow Response Time                                                                                                                                                                    Inefficient heat transfer through the interface layer introduces time lag, making it difficult to capture rapid thermal changes accurately.

• Optical & Radiative Interference                                                                                                                                                             Surface optical properties (e.g., reflectivity vs. absorptivity) can influence high sensing measurements, especially in radiation-involved environments.

• Accuracy & Repeatability Sensitivity                                                                                                                                                 Sensor performance can vary depending on mounting conditions, adhesive layers, pressure, and surface characteristics—resulting in inconsistent measurements.

• Thermal vs. Electrical Trade-off                                                                                                                                                 Applications often require both electrical insulation and efficient heat transfer—a combination that is difficult to achieve with conventional materials.

• Harsh Environment Reliability                                                                                                                                                               High temperature, humidity, vibration, and mechanical stress can degrade interface stability, affecting long-term measurement reliability.
  
  

In many cases, system instability arises not from a single issue, but from conflicting material requirements.

Our PBT  Approach:

PBT is engineered as a thermally conductive, electrically insulating, and conformable interface material engineered for precision thermal sensing.

• Reduced Thermal Contact Resistance
  Enhances heat transfer efficiency between the target surface and the sensing element, minimizing energy loss across the interface.

• Faster Thermal Response
  Enables a more efficient thermal path, PBT helps sensors capture rapid temperature and heat flux changes with improved responsiveness.

• Suppression of Optical & Radiative Interference
  The black surface can enhance thermal absorption behavior, making it beneficial in applications involving radiative heat transfer or optical sensitivity.

• Electrical Insulation with Thermal Efficiency
  Delivers reliable electrical isolation while maintaining effective heat conduction—ideal for sensors mounted on conductive or energized surfaces.

• Conformal Surface Contact                                                                                                                                                                 The flexible nature of PI film allows PBT to adapt to real-world surfaces—flat, curved, or slightly rough—reducing air gaps and improving measurement consistency.

• Stability in Harsh Environments                                                                                                                                                        Built on a PI platform, PBT supports stable operation under high temperature, humidity, and mechanical stress conditions.

Unlike conventional black films or generic thermal materials, PBT is designed to function as a controlled thermal and optical interface, not a compromise layer.

Typical Applications:

PBT is ideal for designs requiring heat conduction, heat dissipation, and optical shielding, including:

1. Automotive LiDAR / IR Sensor (ADAS) / Advanced Optical Sensor Modules .
2. CMOS Image Sensor Module (ADAS) – Backside Thermal & Optical Control Layer
3. LED light bar boards and LED backlighting modules (light shielding + heat spreading).
4. Surface and immersion Temperature sensors and Heat flux sensors.
5. Camera Control PCB / ISP Module.
6. Automotive In-Cabin Sensing & Driver Monitoring Optical Modules.

Application Cases: 

I. Heat Flux Sensing for Industrial Furnaces & High-Temperature Surfaces 

Black Thermal Conductivity PI Film (PBT) enables accurate and stable heat flux measurement on high-temperature surfaces such as industrial furnaces and heat processing equipment. By enhancing thermal coupling and minimizing radiative interference, PBT supports improved process control, efficiency, and system reliability in harsh environments.

Designing systems that require both effective heat dissipation and complete light blocking?

Contact us to discuss Black & Opaque Thermal Conductivity PI Film (PBT) solutions tailored for your thermal load, optical sensitivity, and electrical safety requirements.