Isola 250HR is a high-performance FR-4 epoxy laminate and prepreg system engineered for applications demanding exceptional thermal reliability, mechanical strength, and electrical stability. It is widely used in aerospace, automotive, high-speed digital, and industrial control PCBs that operate under extreme conditions.
Key Features of Isola 250HR
1. High Thermal Reliability
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Glass Transition Temperature (Tg): Approximately 250°C, providing excellent stability during lead-free soldering and multiple reflow cycles.
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Outstanding thermal decomposition resistance (Td > 340°C) ensures long-term reliability in harsh operating environments.
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Excellent for sequential lamination and high-layer-count PCB constructions.
2. Low Z-Axis Expansion
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Low CTE in the Z-axis minimizes stress on plated through holes (PTH) during thermal cycling.
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Significantly improves via reliability and dimensional stability in complex multilayer designs.
3. Excellent Mechanical Strength
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High flexural modulus and peel strength make 250HR ideal for large-format or mechanically demanding boards.
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Maintains structural integrity under thermal shock and vibration.
4. Superior Electrical Performance
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Stable dielectric constant (Dk ≈ 4.25) and low dissipation factor (Df ≈ 0.015) ensure excellent signal integrity in high-speed digital and RF applications.
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Consistent performance across temperature and frequency ranges.
5. RoHS & REACH Compliant
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Fully compliant with environmental safety standards for green electronics manufacturing.
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Compatible with lead-free assembly and halogen-free PCB design.
Applications of Isola 250HR
Aerospace & Defense
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Ideal for avionics, radar systems, and mission-critical control units that require high reliability under wide temperature ranges.
Automotive Electronics
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Commonly used in engine control modules (ECUs), ADAS radar boards, and powertrain systems due to its superior heat resistance.
High-Speed Digital & Data Centers
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Excellent material for servers, networking switches, backplanes, and signal integrity-sensitive designs.
Industrial & Power Electronics
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Performs reliably in motor control, power conversion, robotics, and industrial automation environments involving repeated thermal cycling.
Why Choose Isola 250HR?
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Combines high Tg, low CTE, and excellent electrical properties for balanced performance across all PCB design aspects.
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Provides consistent fabrication results, making it suitable for multilayer, high-density PCB manufacturing.
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Its proven reliability and wide process compatibility make it a preferred choice among PCB manufacturers for high-reliability electronic systems.
Technical Summary
| Property | Typical Value | Benefit |
|---|---|---|
| Tg (Glass Transition Temp) | 250°C | Superior high-temp stability |
| Decomposition Temp (Td) | > 340°C | Excellent heat resistance |
| CTE (Z-axis) | < 2.8% (50–260°C) | High PTH reliability |
| Dk (1 MHz) | 4.25 | Stable dielectric constant |
| Df (1 MHz) | 0.015 | Low signal loss |
| Flammability | UL 94 V-0 | Certified safety |
| RoHS Compliance | Yes | Environmentally friendly |
Conclusion
Isola 250HR delivers a robust combination of thermal, mechanical, and electrical performance, making it ideal for high-reliability, multilayer PCB fabrication. Whether in aerospace, automotive, or high-speed computing, 250HR ensures durability, process stability, and signal integrity throughout the product lifecycle.
