Why Choose Our Dielectric Pads?
- GALLOP INNOTEK has over a decade of experience in the manufacture of dielectric materials, achieving a monthly production capacity of 500 tonnes.
- GALLOP INNOTEK maintains a comprehensive In-house quality testing system to ensure each dielectric pad meets high-quality standards.
- All dielectric pads are certified to ISO 9001:2015, ISO 14001, IATF 16949 and ISO 45001.
- Whether ordering small batches or large quantities, you can obtain complimentary samples promptly.
- GALLOP INNOTEK provides you with all services from product selection to assembly.
Your Trusted Dielectric Pads Supplier in China
Dielectric pads are suitable for electronic and electrical products that need to solve both heat dissipation and insulation issues. They can be used in applications that require high dielectric strength and high thermal conductivity. Before purchasing, you should confirm the required dielectric strength, thermal conductivity, thickness, size, and operating temperature to match the specific product structure.
GALLOP INNOTEK provides you with custom dielectric pads. We support thermal simulation, CFD simulation, rapid prototyping, and OEM solutions to help optimize product design and delivery efficiency. With 5+ testing laboratories and strict quality control processes, we ensure stable and consistent quality of dielectric pads. Don’t wait！Contact us to discuss your dielectric pad requirements and get a custom solution now.
Features of Dielectric Pads
Provides 1–10 kV/mm dielectric strength and 1–13 kV/mm breakdown voltage, helping maintain reliable electrical insulation under demanding operating conditions.
Our thermal dielectric pads offer thermal conductivity ranging from 1 to 20 W/m·K while maintaining electrical insulation.
Pre-machining and precision cutting reduce installation steps and costs, and resolve both issues at once.
Dielectric pads ranging from 0.2mm to 20mm are available for different gap dimensions.
Dielectric Pads are compressible and can be easily pressed to conform to the surfaces of components and heat sinks.
Less prone to drying out or leaking during use, maintaining long-term stable performance for your product.
Provides additional cushioning protection for high-vibration and impact applications.
High performance, extended service life and efficient installation deliver outstanding cost-effectiveness.
Flexible Customisation
GALLOP INNOTEK offers customised options for dielectric pad thickness, thermal conductivity, dielectric strength and other properties to meet your diverse product requirements. We provide comprehensive guidance throughout the entire process prior to your product’s launch. Should you be uncertain about thermal conductivity specifications, we can arrange professional thermal simulation testing. We also support rapid prototyping and mould flow analysis services to accelerate project progress. Additionally, we offer precision cutting and assembly services for dielectric pads.
Combined Thermal and Electrical
Thermally conductive dielectric pads combine heat transfer and electrical insulation in one thermal interface material. On the one hand, the elimination of separate thermal conductive and insulating materials simplifies installation and processing operations, and you can get higher production efficiency. On the other hand, it reduces the initial investment in procuring two distinct materials and minimises additional installation costs, proving cost-effective for both small and large production runs.
Long-Lasting Dielectric Pads with In-House Reliability Testing
Dielectric pads have less drying and oozing compared to thermal pastes, and achieve stable function for extended periods (approximately 2 to 10 years). Therefore, your product can enjoy a longer lifespan and require less maintenance. Furthermore, GALLOP INNOTEK operates its own testing laboratory, where all products undergo ageing tests, temperature cycling tests, breakdown voltage tests, and other assessments prior to shipment to make sure long-term reliability.
Applications of Dielectric Pads
Used between components such as MOSFETs or IGBTs and heat sinks. Accelerates cooling and reduces the risk of short circuits, offering stable functioning.
Suitable for use in ECU components, OBC and battery systems. High dielectric strength battery pads can help provide electrical insulation between battery components and heat dissipation structures while managing thermal loads.
Dielectric pads used in UPS systems and solar inverters achieve continuous high-voltage operation, reducing damage and downtime caused by overheating and short circuits.
Certain types of dielectric pads offer not only long-term durability but also corrosion resistance, protecting transformers and power supplies while enhancing operational stability.
Power supply equipment, control apparatus and electrical installations within industrial settings may all utilise dielectric spacers for thermal management and insulation protection.
In high-frequency electronic equipment, dielectric pads can enhance operational accuracy by reducing signal crosstalk whilst providing efficient heat dissipation.
Dielectric pads can be used between heat-generating battery components and cooling structures where thermal transfer and electrical isolation are both required.
Project Cases Example
Our dielectric pads were adopted by an EV manufacturer for on-board chargers. After 1000 thermal cycles from -40℃ to 125℃, no dielectric breakdown occurred. Under full load, the hotspot temperature of power components dropped by 7.6℃, and module failure rate reduced by 82%. The solution passed IATF16949 certification and entered mass vehicle production.
A telecom equipment supplier selected our 0.6mm dielectric pads for 5G AAU power modules. During continuous operation at 85℃, leakage current stayed below 10 μA. The thermal interface resistance decreased by 55%, with overall temperature rise controlled within 9K. Module defect rate fell from 2.1% to 0.28%, supporting stable long-term outdoor base station operation.
Dielectric Pad Specifications
| Specification | Reference Value |
| Thermal Conductivity | 1–20 W/m·K |
| Dielectric Strength | 1–10 kV/mm |
| Dielectric Breakdown Voltage | 1–13 kV/mm |
| Thickness | 0.2–20 mm |
| Hardness | 20–65 Shore 00 |
| Volume Resistivity | 10¹²–10¹³ Ω·cm |
| UL94 Flammability | V-0 |
| Operating Temperature | -40 to +200°C |
| Thermal Resistance | 0.08–0.50 °C·in²/W |
| Dielectric Constant | 4–8 @ 1 MHz |
| Shape | Sheet or Custom Die-Cut |
| Size | Standard or Custom |
| Thickness Tolerance | ±10% |
Dielectric pads are thermal pads with high dielectric strength, balancing thermal dissipation performance with dielectric properties. Certain thermal interface materials excel in heat dissipation but feature low dielectric strength, and they are unsuitable for electrical equipment.
Yes, dielectric pads combine dielectric strength with thermal conductivity. Should your product require both insulating protection and efficient heat dissipation, it is the first choice.
Certainly, dielectric pads can help achieve more stable operation in high-voltage applications. You may select a dielectric pad with enough dielectric strength according to the voltage level of your application.
This depends on the gap size between the components and heat sinks within your product. You should select or customise a thickness that matches accordingly. Both excessively thin and excessively thick options fail to maximise thermal contact area, thereby compromising the performance of the dielectric pads.
Silicone dielectric pads dissipate heat from components whilst providing insulation. Mica insulating materials require the use of thermal paste to achieve effective heat dissipation. Therefore, silicone dielectric pads offer simpler installation and greater cost-effectiveness.
Yes, the thickness, hardness and other properties of the dielectric pads can be customised. We can also pre-cut the dielectric pads to precise specifications according to your requirements.
Both are used to determine how much voltage a dielectric pad can withstand.
- Dielectric strength mainly refers to how much voltage the material can withstand per millimeter of thickness. It is usually measured in kV/mm.
- Breakdown voltage refers to the voltage at which a pad with a specific thickness breaks down.
Dielectric strength is more suitable for comparing materials, while breakdown voltage is more suitable for determining whether a specific pad can meet your product’s voltage requirements. When selecting a pad, you need to consider both the pad thickness and the actual working voltage.
The dielectric constant describes how a thermal pad responds to an electric field and is an important electrical property for insulation and high-frequency applications. The thermal pad dielectric constant varies with the material, formulation, test frequency, and temperature.
There is no fixed compression ratio that is suitable for all products. Usually, proper compression helps the pad fit more closely between the component and heat sink, which helps heat dissipation. However, excessive compression may damage the pad or affect assembly. When selecting a pad, you should determine the proper compression range based on the pad thickness, hardness, and installation method.
Do not simply aim for higher thermal conductivity or higher dielectric strength. You should consider the actual needs of your product. If your equipment generates a lot of heat, you need to focus on thermal conductivity. If the working voltage is high, you need sufficient dielectric strength.
Volume resistivity can be simply understood as the material’s ability to resist the flow of electricity. A higher value usually means better electrical insulation. For dielectric pads, higher volume resistivity helps prevent current from passing through the pad and reduces the risk of short circuits or leakage.
UL94 is a standard used to evaluate the burning and flame resistance of materials. For power supplies, automotive electronics, power modules, and other products with flame resistance requirements, UL94 V-0 is a common high flame resistance rating. When purchasing, you can confirm with us whether the UL94 rating we provide applies to the actual material and thickness you use. We can also provide test reports.
What are Dielectric Pads?
Dielectric pads are thermally conductive electrical insulation materials placed between heat-generating components and heat sinks to transfer heat while preventing electrical conduction. This allows for the safer application of thermal pads in power supply modules, electronic equipment, etc., and further enhances product operational reliability.
Types of Dielectric Pads
Silicone Dielectric Pads
Silicone dielectric pads combine high thermal conductivity, high dielectric strength, and excellent compressibility. A high dielectric thermal conductive silicone pad can provide both heat transfer and electrical insulation between components and heat sinks. They are manufactured by incorporating highly conductive materials(such as aluminium oxide, boron nitride, or aluminium nitride) into highly insulating silicone rubber. Their dielectric strength typically ranges from 1 to 10 kV/mm, allowing you to use them across industrial equipment, automotive, and energy sectors. Additionally, their elastic properties provide effective cushioning against vibration and impact, enhancing overall safety.
Fibreglass Reinforced Silicone Pads
Fibreglass reinforced silicone pads achieve superior mechanical strength through the addition of glass fibre reinforcement. They achieve less deformation and tearing than silicone dielectric pads, though this also reduces their thermal conductivity. They are well-suited for industrial applications subject to high stress. This enables your products to achieve a longer service life.
Ceramic Dielectric Pads
Ceramic dielectric pads are typically composed of materials such as aluminium oxide or aluminium nitride ceramics. They generally have ultra-high thermal conductivity and dielectric strength compared to mica dielectric pads and fibreglass reinforced silicone pads, alongside greater hardness. Additionally, they possess corrosion resistance and can withstand harsher environments. However, they lack elasticity and are more prone to fracture compared to silicone alternatives. Ceramic pads are less suitable for applications with significant vibration or impact because they are more brittle than silicone-based materials.
Mica Dielectric Pads
Mica is also a material with high insulation properties and thermal resistance. It requires processing into sheets and must be used in conjunction with thermal grease. This makes both its processing and installation rather complex. Some product designers may choose silicone dielectric pads instead of mica sheets when easier installation and integrated thermal transfer are required.
Phase Change Dielectric Pads
Phase-change dielectric pads can be installed with equal ease between heat sinks and components as silicone thermal pads. When components generate heat, the pad absorbs it and transitions to a liquid state. This allows it to conform more closely to surfaces, achieving superior thermal transfer and insulation. It subsequently releases heat and solidifies at lower temperatures. Consequently, it maintains a stable temperature range for your products, making it ideal for temperature-sensitive applications.
How to Install Dielectric Pads Between Components and Heat Sinks?
Confirm the Installation Size
Before installation, you should first confirm the gap between the heat-generating component and the heat sink, as well as the area the pad needs to cover. A pad that is too thin may not fill the gap, while a pad that is too thick may increase thermal resistance or affect assembly. You need to confirm the actual gap and pad size before selecting the right specification.
Keep the Contact Surfaces Clean
You should thoroughly remove dust, oil, and other contaminants from the surfaces of the component and heat sink. If there are contaminants on the surfaces, the pad cannot fully fit the surfaces. This can affect heat transfer and long-term assembly stability.
Place the Pad Flat Between the Component and Heat Sink
During installation, you should make sure the pad covers the areas that require electrical insulation and heat transfer. Keep the pad flat and avoid folding, wrinkling, or shifting it out of position. If the pad does not fully cover the area that requires electrical insulation, it may affect the actual electrical isolation.
Apply the Required Pressure to the Pad
After installation, you need to apply proper pressure to make the pad fully contact the component and heat sink. Too little pressure may leave air gaps, while too much pressure may damage the pad or affect assembly. You should install the pad according to the recommended compression range for the pad material and the supplier’s requirements.
Check the Position and Compression
After assembly, you need to check whether the pad has shifted, been damaged, or been over-compressed. You should also confirm that there are no obvious gaps between the component, pad, and heat sink. For mass production, you should also include installation pressure, compression, and position in the assembly quality inspection.
How Do Dielectric Pads Provide Both Thermal Transfer and Electrical Insulation?
Insulating Material Transfers Heat
Although dielectric pads do not conduct electricity, they can transfer heat. After installation, the pad fills the small gaps between the heat-generating component and the heat sink, allowing heat to move from the component to the heat sink and then be carried away.
Insulating Layer Prevents Current Flow
A dielectric pad is placed between a powered component and a metal heat sink. It prevents current from flowing from the component to the heat sink, keeping the two electrically isolated. Therefore, when selecting a pad, you should not only consider thermal conductivity. You also need to confirm that its insulation performance meets your working voltage requirements.
The Pad Meets Both Thermal and Insulation Requirements
If your application requires both heat dissipation and electrical insulation, both requirements need to be met. For example, the thermal performance needs to meet the heat dissipation requirements of your equipment, while the insulation performance needs to meet the actual working voltage and safety requirements. You should finally select the right pad based on your working voltage, heat generation, and installation space.
Common Dielectric Pad Problems and How to Prevent Them
| Problem | Possible Cause | Prevention |
| Electrical breakdown | Insufficient insulation margin / damage | Check insulation requirements |
| Poor heat transfer | Air gaps / insufficient contact | Control compression and surface contact |
| Pad tearing | Excessive mechanical stress | Select suitable hardness and thickness |
| Pad displacement | Poor positioning | Use proper size or adhesive design |
| Long-term performance loss | Temperature / aging | Verify operating conditions |
How to Choose the Right Dielectric Pads for Your Application?
Specify the Operating Voltage and Thermal Conductivity
First, you must select a dielectric pad with enough performance based on the product’s operating voltage and thermal load. When choosing dielectric strength, select according to the maximum operating voltage(kV/mm) while incorporating a safety margin. When selecting thermal conductivity, you must also consider thermal resistance.
Choose the Right Thickness
Accurately measure the gap thickness between the component and heat sink to select the most suitable dielectric pad. While thicker thermal pads may achieve better insulation, they increase thermal resistance and reduce heat dissipation efficiency. You may balance these factors when making your selection. Should your component feature a complex surface profile, opting for a softer dielectric pad will provide better conformability.
Consider the operating Temperature
Different models of dielectric pads have different operating temperatures(typically ranging from -60 to 200°C). Selection should be based on the products’ operating temperature. Use beyond the optimum operating temperature may result in reduced dielectric and thermal dissipation performance, and may also affect the service life of pads and products.
