# How to Choose High Temperature PCB Material?

_Published: 2025-11-21_

Table of Contents

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- Why Choose High Temperature PCB Material?
- High Temperature PCB Material Datasheet
- Common High Temperature PCB Materials Types
- How to Choose High Temperature PCB Material?
- Common High Temperature PCB Material Suppliers
- How to Select A Reliable High Temperature PCB Material Supplier?
- How Much Does High Temperature PCB Materials Cost?

How to choose **[high temperature PCB material](https://www.bestpcbs.com/blog/2025/11/how-to-choose-high-temperature-pcb-material/)**? This blog is mainly about datasheet, types, selection guide, common supplier and cost for high temperature PCB material.

**Are you troubled these issues with high temperature PCB?**

- High-temp PCBs cracking/delaminating above 150°C?
- Signal distortions in hot-humid environments unsolved?
- Copper migration/insulation failure after long-term heat exposure?

**As a professional high temperature PCB manufacturer, EBest Circuit (Best Technology) can provide you service and solutions:**

- Custom 200°C+ Materials – Tailored substrates eliminate dielectric loss spikes, ensuring stable signals.
- Stress-Resistant Design – Honeycomb cooling + thermal expansion compensation keeps deformation under 0.1mm at 180°C swings.
- 2000-Hour Aging Validation – Full-cycle testing (heat/cold/humidity) provides traceable reliability data.
- Twenty years of high-temp PCB expertise – solving “can’t use, can’t perform, can’t last” challenges directly.

**Feel free to contact us if you have any inquiry for [high temperature PCB](https://www.bestpcbs.com/blog/2025/11/how-to-choose-high-temperature-pcb-material/) board: [sales@bestpcbs.com](mailto:sales@bestpcbs.com).**

## Why Choose High Temperature PCB Material?

**Reasons Why Choose [High Temperature PCB Material](https://www.bestpcbs.com/blog/2025/11/how-to-choose-high-temperature-pcb-material/):**

- For extreme operating environments: Equipment requiring long-term operation above 150°C (e.g., automotive engine compartments, spacecraft, oil well drilling equipment) will soften and fail due to the presence of ordinary materials.
- Ensuring structural stability at high temperatures: A high glass transition temperature (Tg≥170°C) prevents PCB deformation and delamination due to heat, avoiding solder joint cracking and component displacement.
- Improving long-term reliability: A low coefficient of thermal expansion (CTE) reduces temperature cycling stress, preventing through-hole copper foil breakage (“barrel cracking”) and extending equipment life (critically used in aerospace and medical equipment).
- Meeting lead-free soldering requirements: Lead-free solder has a high melting point (~217°C), and high-temperature materials (Tg >180°C) can withstand multiple soldering/rework processes without delamination.
- Preventing conductive anode wire (CAF) failure: In high-temperature and high-humidity environments, special resin formulations (e.g., polyimide, modified epoxy) can inhibit short circuits caused by copper ion migration.
- Supports high-power/high-density designs: High-power devices (such as electric vehicle motor controllers) generate localized high temperatures, requiring materials to maintain insulation and mechanical strength within the high-temperature internal layer.
- Accommodates high-frequency/high-speed circuit requirements: Some high-temperature materials (such as PTFE and modified PPO) also possess low dielectric loss (Df), making them suitable for high-frequency applications such as 5G and radar.
- Meets stringent industry certification standards: Automotive (AEC-Q), aerospace (MIL), and industrial applications require mandatory high-temperature reliability testing; specialized materials are a prerequisite for compliance.

[https://www.bestpcbs.com/blog/wp-content/uploads/2025/11/main-33.jpg](https://www.bestpcbs.com/blog/wp-content/uploads/2025/11/main-33.jpg)

## High Temperature PCB Material Datasheet

**Parameter**
**Specification**

Glass Transition Temperature (Tg)
130°C, 150°C, 170°C, 180°C, 200°C+

Thermal Decomposition Temperature (Td)        
300°C, 320°C, 340°C, 350°C+

Coefficient of Thermal Expansion (CTE)
X/Y Axis: 12-16 ppm/°C

Z Axis
40-70 ppm/°C

Thermal Conductivity    
0.2-0.5 W/(m·K)

Water Absorption (24h Immersion)   
<0.10%, <0.05%

Dielectric Constant (Dk)
3.5-4.5 (1GHz-10GHz)

Dissipation Factor (Df)             
0.002-0.008 (1GHz-10GHz)

Soldering Resistance
≥3 cycles of lead-free reflow soldering (288°C)

Peel Strength
≥0.8 N/mm (copper foil adhesion)

Volume Resistivity
>10¹⁴ Ω·cm

Surface Resistivity
>10¹³ Ω

## Common High Temperature PCB Materials Types

**Polyimide (PI)**

- Features: Polyimide is one of the most widely used high-temperature PCB materials, with a glass transition temperature (Tg) typically exceeding 250°C and long-term operating temperatures up to 200°C or higher. It exhibits excellent heat resistance, mechanical strength, flexibility, and resistance to chemical corrosion and radiation.
- Applications: Suitable for high-temperature environments such as aerospace, automotive electronics (e.g., engine control systems), military equipment, and medical instruments. Flexible versions are also applicable to wearable devices.
- Advantages: High reliability, good dimensional stability, but higher costs and greater processing difficulty.

**Polytetrafluoroethylene (PTFE)**

- Features: PTFE is a high-frequency material with a Tg of approximately 160°C, though it can withstand short-term temperatures up to 260°C. It is renowned for low dielectric constant and low loss factor, ideal for high-frequency and high-speed applications.
- Applications: Primarily used in communication equipment (e.g., 5G base stations), radar systems, and RF modules. For high-temperature environments, it requires combination with reinforcing materials (e.g., ceramic fillers).
- Advantages: Excellent electrical performance and chemical resistance, but poor adhesion, necessitating specialized processing techniques.

**Ceramic Substrate Materials (e.g., Al₂O₃ and AlN)**

- Features: Ceramic materials offer extremely high thermal conductivity and heat resistance, with operating temperatures exceeding 300°C. Alumina (Al₂O₃) is cost-effective, while aluminum nitride (AlN) provides superior thermal conductivity for high-power density designs.
- Applications: Common in power electronics, LED lighting, electric vehicles, and industrial control systems, used for critical heat-dissipating components.
- Advantages: Outstanding thermal management and mechanical strength, but relatively brittle, requiring careful handling.

**Epoxy Resin Composites (e.g., High-Temperature FR-4)**

- Features: Standard FR-4 has a Tg of 130-140°C, while high-temperature variants can elevate Tg to 170-180°C by incorporating fillers (e.g., brominated epoxy). It provides good electrical insulation and cost efficiency.
- Applications: Suitable for moderate high-temperature environments in consumer electronics, household appliances, and general industrial equipment, commonly selected for economical high-temperature applications.
- Advantages: Low cost, easy processing, but limited temperature resistance, unsuitable for extreme conditions.

**Liquid Crystal Polymer (LCP)**

- Features: LCP has a Tg exceeding 280°C, featuring low moisture absorption, high dimensional stability, and exceptional high-frequency performance. It maintains stable performance in high-temperature and high-humidity environments.
- Applications: Mainly used in high-frequency circuits, automotive sensors, and mobile communication devices, particularly suited for miniaturized designs.
- Advantages: Balanced overall performance, suitable for complex environments, but higher raw material costs.

**Phenolic Resin-Based Materials**

- Features: These materials typically have a Tg of 150-200°C, offering good heat resistance and mechanical hardness, but average electrical performance.
- Applications: Common in older industrial equipment or low-cost applications such as power modules and transformers.
- Advantages: Economical, practical, and readily available, but gradually being replaced by high-performance materials.

[https://www.bestpcbs.com/blog/wp-content/uploads/2025/11/High-Tg-PCB.jpg](https://www.bestpcbs.com/blog/wp-content/uploads/2025/11/High-Tg-PCB.jpg)

## How to Choose High Temperature PCB Material?

**Below Is A Detailed Selection Guide for [High Temperature PCB Material](https://www.bestpcbs.com/blog/2025/11/how-to-choose-high-temperature-pcb-material/):**

**1. Clarify Application Scenarios and Temperature Requirements**

- Scenario Identification: Precisely define the product operating environment (e.g., automotive engine compartments, aerospace, industrial controls, 5G base stations), as temperature gradients vary significantly across scenarios.
- Temperature Threshold: Determine the maximum continuous operating temperature (e.g., automotive electronics ≥150°C, aerospace up to 300°C+), thermal shock tolerance range (e.g., -55°C to 200°C), and peak soldering temperature (260°C±5°C).
- Lifespan Expectation: Reverse-engineer material long-term thermal stability thresholds based on product design lifespan (e.g., industrial-grade ≥10 years).

**2. Match Substrate Type to Temperature-Resistant Parameters**

- FR-4 Series: Standard Tg 130-140°C (long-term operation ≤105°C), high-Tg variants ≥170°C (e.g., FR-5, polyimide-reinforced types), suitable for consumer electronics to mid-range industrial scenarios.
- Polyimide (PI): Tg >250°C, withstands extreme environments (-269°C to 300°C), preferred for aerospace flexible circuits, combining dielectric stability and chemical resistance.
- Ceramic Substrates: Alumina (Al₂O₃, thermal conductivity 24W/m·K), aluminum nitride (AlN, 170-230W/m·K), suitable for high-power RF modules and LED heat dissipation, withstanding >300°C.
- Metal Substrates: Aluminum (1-3W/m·K thermal conductivity, cost-effective), copper (200-400W/m·K, high-power scenarios), copper-tungsten alloy (CTE matching semiconductor devices), balancing thermal conductivity and CTE differences.

**3. Optimize Coefficient of Thermal Expansion (CTE) Matching**

- CTE Discrepancy Risks: FR-4 (12-18ppm/°C) and copper (16-17ppm/°C) have similar CTEs, but high-temperature interlayer stress may cause via fractures and solder joint fatigue.
- Low-CTE Material Selection: High-Tg FR-4 (CTE ≤14ppm/°C), polyimide (10-15ppm/°C), ceramic (4-8ppm/°C), copper-tungsten alloy (6-8ppm/°C), matching semiconductor device CTEs (e.g., SiC 3-6ppm/°C).
- Design Compensation Strategies: Use stepped via structures, symmetric stack layouts, and additional heat-dissipating copper foils to reduce thermal cycling stress concentration.

**4. Thermal Conductivity and Heat Dissipation Design**

- Thermal Conductivity (W/m·K): FR-4 (0.2-0.4), aluminum (1-3), copper (200-400), ceramic (20-230). High-thermal-conductivity materials require matching heat dissipation path designs.
- Heat Dissipation Optimization: Increase copper layer thickness (≥2oz), implement thermal vias/heat-sink pads, and use thermal interface materials (TIMs), combined with finite element simulation to optimize heat flux density distribution.

**5. Validate Dielectric Performance Stability**

- Dielectric Constant (Dk) Temperature Coefficient (TCDk): FR-4 TCDk -200 to -400ppm/°C (signal drift risks in high-frequency scenarios). Modified materials like Rogers RO4350B (TCDk +50ppm/°C) and Taconic TLY-5 (TCDk +10ppm/°C) offer greater stability.
- Testing and Compensation: Measure Dk temperature characteristics via resonant cavity/transmission line methods. Design with impedance matching allowances. High-frequency circuits may require dynamic compensation algorithms (e.g., clock delay adjustment).

**6. Chemical Resistance and Environmental Adaptability**

- Chemical Corrosion Resistance: Polyimide and ceramic substrates resist acid/base and solvent corrosion. FR-4 requires compatibility evaluation with conformal coatings to avoid CAF (cathodic anode filament) short-circuit risks.
- Moisture and Humidity Resistance: Low-moisture-absorption materials (e.g., ceramic 300°C) and robust insulation reliability for multi-layer (20+ layer) PCBs.

**Business**

- MEGTRON2–MEGTRON8 high-speed/high-frequency laminates and prepregs.
- Deployed in routers, servers, mobile base stations, and automotive radar systems requiring high temperature and reliability.

**4. Shengyi Technology**

**Advantages**

- High-Tg portfolio: SI10US Tg=280°C, S1000-2 Tg=170°C, S7439G Tg=189°C.
- Low moisture absorption (≤0.1%) and superior CAF resistance for enhanced humidity/thermal reliability.
- Halogen-free designs compatible with lead-free soldering processes.

**Business**

- Product lines include standard FR-4, mid-high-speed materials (Synamic series), and polyimide substrates (e.g., SH260 Tg>250°C).
- Widely used in computing, telecommunications, automotive electronics, and consumer electronics.

**5. Kingboard (Jian Tao Laminates)**

**Advantages**

- KB-6164 Tg=140°C with robust thermal performance and CAF resistance, meeting IPC-4101D/27 standards.
- Cost-effective solutions competitive in mid-tier high-temperature applications.
- Diverse options including yellow/white CEM-1 composite substrates and black FR-4.

**Business **

- Supplies conventional and mid-performance laminates (FR-4, CEM-1, CEM-3).
- Clients span consumer electronics, power equipment, and industrial control sectors.

## How to Select A Reliable High Temperature PCB Material Supplier?

**1. Define Core Performance Parameters for High-Temperature PCB Materials**

- Ensure precise matching of temperature resistance grades (e.g., Tg ≥ 180°C, Td ≥ 320°C, CTE ≤ 20ppm/℃) based on application scenarios (e.g., automotive engine compartments, aerospace).
- Validate long-term thermal aging performance through accelerated aging tests (e.g., ≤3% dielectric constant variation, ≥90% insulation resistance retention after 1000 hours at 150°C).

**2. Verify Supplier Quality Certifications and Compliance**

- Prioritize suppliers with international certifications such as ISO 9001, IATF 16949 (automotive), AS 9100 (aerospace), and UL 94 V-0 (flame retardancy) to meet target market regulations.
- Require third-party test reports from SGS or TÜV Rheinland covering RoHS, REACH, HF compliance, and complete thermal/electrical/mechanical performance data.

**3. Assess Customized Technical Support Capabilities**

- Evaluate the supplier’s ability to develop customized material formulations (e.g., high-frequency, chemical-resistant, ultra-thin substrates) and provide samples for validation.
- Ensure process compatibility support, including optimized lamination temperature profiles, drilling parameters, and surface treatment processes.

**4. Ensure Supply Chain Stability and Delivery Guarantees**

- Select suppliers with global logistics networks and local technical teams supporting trade terms like DDU/DDP, ensuring 7-14 day lead times and reduced international shipping risks.
- Review inventory management systems and emergency response plans for urgent orders (e.g., 48-hour expedited delivery).

**5. Validate Customer References and Reputation**

- Request case studies from automotive (e.g., Bosch, Continental), aerospace (e.g., Airbus, Boeing), and industrial control (e.g., Siemens, ABB) sectors, along with backdoor reference contacts.
- Check independent reviews on platforms like Trustpilot or Google Reviews for quality consistency, technical response speed, and after-sales service quality.

**6. Optimize Cost Efficiency and Long-Term Partnership Strategies**

- Demand transparent pricing (material costs, processing fees, logistics) and negotiate tiered pricing/annual rebates via long-term contracts.
- Prioritize ESG-compliant partners with carbon footprint management, waste reduction practices, and sustainable supply chain initiatives to enhance corporate image.

**7. Emphasize Environmental and Sustainability Practices**

- Choose suppliers using halogen-free, recyclable substrates compliant with EU ELV/WEEE directives to minimize lifecycle environmental impact.
- Require carbon footprint reports and support carbon reduction through optimized packaging/logistics (e.g., sea freight over air freight) to align with client decarbonization goals.

## How Much Does High Temperature PCB Materials Cost?

**Specialty Copper Clad Laminates**

- High-Frequency, High-Speed ​​Copper Clad Laminates (e.g., Rogers series): $300 – $800/㎡ (Depending on dielectric constant and loss factor grades).
- Ceramic-Based Copper Clad Laminates (High Thermal Conductivity): $180 – $500/㎡ (Alumina-based substrates are cheaper; aluminum nitride substrates can reach $450+/㎡).
- High-Temperature Copper Foil (300℃+): $25 – $50/kg (For extreme environments such as all-solid-state batteries).

**Resin Systems**

- Polyimide Resin (PI): $120 – $300/kg (ESA certified VT-901PI and other models are 30% more expensive).
- High-Heat-Resistant Epoxy Resin (M9 grade): $80 – $150/kg (Domestic alternatives are 20%-30% cheaper).

**Conformal Coating Materials:**

- Silicone-based: $40 – $80/L (High temperature resistance >200℃).
- Polyurethane-based: $20 – Acrylic resin: $7 – $10/L (including solvent) $35/L.

Welcome to contact us if you need any help for high temperature PCB materials:** [sales@bestpcbs.com](mailto:sales@bestpcbs.com)**.