Shanghai Jituo Materials Technology Co., Ltd. Provides Dielectric Constant Testing Services
1. Material R&D Stage: Core Navigation for Targeted Design
Dielectric constant is a core indicator for the design of new material compositions and structures, directly determining the functional positioning and application direction of materials. It is a key means to optimize materials for adaptation to complex scenarios.
Insulating Materials: Performance Barrier for Safety Protection
Fluctuations in the dielectric constant of high-voltage cable insulation materials (e.g., increasing from 2.3 to 2.8) can cause uneven electric fields and increase breakdown risks. By real-time monitoring of dielectric constant, early warning of insulation failure can be issued when the operating temperature exceeds 90℃ and the dielectric constant increase exceeds 0.2. Reducing the dielectric constant of motor insulation paint from 4.0 to 3.0 can lower energy loss and improve motor efficiency by 5%-8%.
Conductive Composite Materials: Regulatory Tool for Electromagnetic Compatibility
The dielectric constant of electronic device housing materials needs to be controlled between 8-12 to balance electromagnetic shielding effectiveness (SE) and cost. When the carbon fiber content of carbon fiber/ABS composite materials is 20%, the dielectric constant stabilizes at 10, and the SE can reach over 45dB, meeting the anti-interference requirements of military equipment.
Flexible Electronic Materials: Performance Guarantee for Deformation Scenarios
When the bending radius of flexible polyimide films is <5mm, a dielectric constant change exceeding 5% will lead to sensor signal distortion. By adding 5% flexible segments, the dielectric constant fluctuation of the material is only 2% at a bending radius of 2mm, ensuring the stability of flexible screens after 100,000 folds.
2. Material Quality Control: Compliance Threshold for Mass Production
Electronic-Grade Materials: Quality Red Line for High-Precision Production
Semiconductor packaging materials require a dielectric constant deviation of ≤±2%. If the dielectric constant of epoxy molding compound increases from 4.0 to 4.1 (deviation of 2.5%), it will cause chip signal delay. PCB laminates with a dielectric constant outside the standard range of 3.8-4.2 are deemed unqualified to avoid signal transmission failures.
New Energy Materials: Bottom Line Guarantee for Safe Operation
The dielectric constant of lithium battery separators needs to be stable between 2.0-2.5. A value that is too high (>3.0) will increase ion conduction resistance, while a value that is too low (<1.8) will reduce insulation. Full-length dielectric constant testing can build a solid safety barrier for batteries.
Medical Materials: Invisible Gatekeeper for Biocompatibility
The dielectric constant of packaging materials for implantable sensors needs to match that of human muscle (ε≈50-60). Deviations from this range can cause tissue irritation or signal distortion. Strict dielectric constant screening can ensure the safety of long-term implantation.
3. Dielectric Constant Testing Methods: Technical Support for Accurate Measurement
Parallel Plate Capacitance Method: Preferred for Low-Frequency Testing of Solid Materials
It features a simple principle and low cost, suitable for flat-surfaced materials such as plastic films and ceramic sheets. However, the test frequency is low (1kHz-1MHz), making it difficult to simulate high-frequency scenarios.
Microwave Resonant Cavity Method: Core for Accurate Testing of High-Frequency Materials
It covers the frequency range of 100MHz-100GHz with high precision (error ±1%), suitable for high-frequency materials such as 5G substrates and microwave ceramics. But the equipment is expensive and sample preparation is complex.
Coaxial Probe Method: Rapid Testing Solution for Liquids and Powders
No sample processing is required, enabling real-time testing of electrolyte solutions, ceramic powders, etc., with a single test taking only a few seconds. However, precision is affected by contact conditions, and the frequency range is relatively narrow (1MHz-6GHz).
Transmission Line Method: Tool for Uniformity Testing of Large-Area Materials
It is suitable for building panels and composite laminates, capable of reflecting the distribution of dielectric constant. But samples need to be processed into specific shapes, and equipment debugging is complex.
4. Dielectric Constant Drives Material Innovation and Upgrading
Dielectric constant runs through the entire chain of material R&D, optimization, and production, serving as a core variable that determines material functions and applications. From high-frequency communication substrates to flexible electronic materials, from semiconductor packaging to medical implant devices, the precise regulation of dielectric constant and the collaborative innovation of testing technologies continuously empower breakthroughs in new energy, electronic information, biomedicine, and other industries. In the future, with the development of two-dimensional materials and intelligent responsive materials, dielectric constant will become an important bridge for exploring the correlation between material microstructure and macro-performance, promoting the cutting-edge innovation of "high-performance, multi-functional, and intelligent" materials.
