In 2026, surging demand from AI servers, EVs and energy storage has strained glass fabric and copper-clad laminate (CCL) capacity. Standard and high-Tg FR4 prices rose ~40% versus 2025, lead times stretched from days to 4+ weeks, and some premium grades are booked into 2027. For electrical manufacturers relying on epoxy glass fiber board for insulation and structural parts, smart material selection and supply strategy matter more than ever.
1. Why FR4 Supply Is Tight in 2026
AI server boards consume 3–5× more glass fabric than legacy designs, and high-end low-CTE T-glass capacity is locked by cloud giants. Meanwhile 800V EVs, wind and PV storage keep draining electronic-grade glass fiber. Panic stocking amplifies the gap, turning standard FR4 from a "3-day item" into allocated supply—a structural tightness expected to last into 2027.
2. Core Properties of FR4 Epoxy Glass Fiber Board
| Property | Typical Range | Engineering Meaning |
|---|---|---|
| Glass transition Tg | 130℃ / 155℃ / 170℃+ | High-Tg fits motor & automotive heat |
| Insulation resistance | ≥ 10^12 Ω | Reliable high-low voltage isolation |
| Temp rating | 130℃–180℃ | Matches B/F/H insulation classes |
| Density | ~1.8 g/cm³ | 1/4 of steel; ideal for lightweight parts |
| Flammability | UL94 V-0 | Meets electrical safety codes |
3. Selecting Insulation & Structural Parts for New Energy
For motor slot insulation, converter supports, battery-module insulators and switchgear parts, epoxy glass fiber board must meet electrical strength, stiffness and temperature together. Specify Tg, thickness, flammability and operating temperature, and confirm the grade against safety marks (UL, RoHS)—never rely on the bare term "FR4", which hides large property gaps.
4. Strategies Under Supply Tightness
- High-Tg substitution: For hotter motor/automotive use, choose 155℃/170℃ high-Tg FR4 to get equal insulation and stiffness at thinner gauge, cutting material per unit.
- Lock orders & dual-source: Reserve critical material physically and qualify a second supplier to avoid allocation outages.
- Outsource fabrication: Shift cutting, drilling and chamfering to a finisher with stable FR4 stock to shorten lead time and reduce dead inventory.
5. Conclusion
Amid structural FR4 tightness, the right material and processing strategy decides delivery and cost. DGGB (Dongguan Chaorong Electronic Products Co., Ltd.) provides FR4 epoxy glass fiber board fabrication and custom insulation parts—including high-Tg grades and stable-supply plans—to help new-energy and power-electronics customers ride out material volatility.
📝 Note: This article is prepared by the technical team of Dongguan Chaorong Electronic Products Co., Ltd. for reference.