The PCB supply chain is entering one of its most challenging phases in recent years. Electronic glass cloth (also known as electronic-grade fiberglass fabric or e-glass cloth)—the critical reinforcement material in copper-clad laminates (CCL)—is set for another significant price increase of approximately 15% in August 2026. With new supply remaining effectively flat and inventories near zero across the industry, cost pressures and allocation constraints are cascading downstream to CCL producers and PCB manufacturers.
Price Trajectory and the August Outlook
Electronic glass cloth has already undergone multiple rounds of increases throughout 2026. Mainstream specifications such as 7628 have roughly doubled from 2025 third-quarter lows, with average market prices climbing to the 7.4–8.7 RMB/m range by early-to-mid July. Thin and ultra-thin styles (2116, 1080) used in HDI and high-layer boards have risen even more sharply. High-end low-dielectric (Low-Dk) fabrics for AI servers have seen still steeper gains in some cases.
Industry feedback and trading data now point to a further ~15% adjustment in August. This timing coincides with the traditional peak season for consumer electronics, power products, and server-related demand in the third quarter (August–October). The combination of seasonal order growth and already tight baseline supply is expected to push prices higher and extend lead times.
Why Supply Is “Lying Flat”
The core issue is structural rather than purely cyclical:
AI-driven demand surge — Modern AI server PCBs often use 20–40+ layers (up to 78 in some flagship designs), consuming 3–8 times the glass cloth of traditional servers. Low-Dk and ultra-thin fabrics required for high-speed signal integrity are in particularly short supply. Demand for these specialized grades is projected to roughly double year-over-year in 2026.
Capacity prioritization — Producers are shifting looms toward higher-margin Low-Dk and specialty fabrics, reducing output of standard e-glass cloth used in conventional FR-4 boards. This creates shortages even for mainstream products.
Equipment bottleneck — High-end weaving machines (primarily Japanese Toyota models) have lead times of 18–24 months. Global delivery capacity is limited, constraining meaningful new capacity additions until late 2026 or into 2027.
Near-zero inventories — The entire chain is operating with minimal buffer stock. Orders for many styles are already booked months ahead, and some suppliers have paused new order acceptance for certain grades.
Upstream electronic yarn prices have also risen sharply, adding further cost pressure.
Downstream Impact on CCL and PCB
Glass cloth typically accounts for a significant portion of CCL cost (often 25–40% for standard FR-4). Repeated cloth increases have already driven multiple CCL price hikes from major producers in 2026, with FR-4 and prepreg (PP) rising in successive rounds of 10–15% or more. PCB manufacturers are responding with their own adjustments, longer lead times, allocation systems, and “supply-guaranteed but not price-guaranteed” policies for many customers.
Standard multilayer boards, HDI, and high-reliability applications are all affected. Smaller and mid-volume buyers face the sharpest pressure on both price and availability. Lead times for many materials have stretched, and some fabricators report that peak-season demand will further tighten conditions through the remainder of 2026. Analysts generally expect meaningful supply relief only from mid-to-late 2027 onward as new yarn and weaving capacity gradually comes online.
Implications for PCB Buyers and Designers
In this environment, proactive material and supply-chain management is essential:
Lock pricing and capacity early for firm production schedules.
Consider design flexibility where possible (e.g., alternative stack-ups or qualified second-source materials) while maintaining performance and reliability requirements.
Prioritize long-term partnerships with fabricators that maintain diversified material sourcing and inventory buffers.
Account for extended lead times and potential allocation in project planning, especially for Q3–Q4 2026 and into 2027.
At Aivon, we continuously monitor upstream material markets, maintain strategic relationships with key CCL and glass-cloth suppliers, and apply rigorous DFM and material qualification processes. This allows us to provide customers with realistic lead-time visibility, cost transparency, and reliable execution even during periods of industry-wide tightness.
The current glass-cloth constraints highlight the interconnected nature of the PCB supply chain. While AI and high-performance computing demand are driving long-term growth, the industry must navigate a multi-quarter period of elevated costs and constrained availability. Buyers who plan ahead and work closely with experienced manufacturing partners will be best positioned to manage these challenges.
