China Launches Glass Circuit Plate Association to Accelerate Domestic TGV and Glass Substrate Technology

New Industry Alliance Targets Glass-Based Advanced Packaging

On May 29, 2026, the China Glass Circuit Plate Association (GCPA) was officially established during the Third International Through-Glass Via Technology Innovation and Application Forum (iTGV 2026) at the Wuxi International Conference Center. Hundreds of industry participants attended the ceremony, marking a new phase of coordinated effort in China’s glass substrate supply chain.

The alliance was jointly initiated by companies spanning the full supply chain:

• Hefei Payton Storage Science and Technology — glass substrate processing
• AKM Meadville — PCB/substrate manufacturing
• WUXI ZHONGWEI HIGH-TECH ELECTRONICS — glass circuit plate fabrication
• WG Tech (JiangXi) Group — glass materials and processing
• Chengdu ECHINT Technology — glass circuit technology
• SCHMID Group — equipment manufacturing (Germany-based)
• Shenzhen Guihua Intelligent Technology — intelligent manufacturing systems

Additional support came from Future Semiconductor and JM Insights as industry research partners.

Why Glass Substrates Matter

Glass substrates represent a potentially transformative next-generation packaging technology that addresses the limitations of current organic (ABF-based) substrates:

Advantages Over Organic Substrates

These properties make glass substrates particularly attractive for:

• AI chip packaging: Large interposers requiring extreme flatness for chiplet assembly
• HBM stacking: CTE match reduces thermal stress on stacked memory
• Co-packaged optics (CPO): Low loss and dimensional stability for optical alignment
• Micro LED displays: Fine-pitch interconnects on optically transparent substrate
• High-performance computing: Better signal integrity at mmWave frequencies

GCPA’s Strategic Objectives

The association outlined five focus areas:

1. TGV technology development: Standardizing through-glass via drilling, metallization, and filling processes
2. GCP mass production processes: Scaling glass circuit plate manufacturing from R&D to production volumes
3. Advanced packaging verification: Qualifying glass substrates for AI chip packaging applications
4. Domestic equipment and materials collaboration: Building China’s indigenous supply chain for glass substrate tools
5. Industry standards and testing systems: Establishing quality and reliability standards

Global Race Intensifies

China’s GCPA launch comes as the global competition for glass substrate commercialization accelerates:

Key Players Worldwide

• Intel (USA): Pioneered glass substrate technology since 2023; Rio Rancho facility moving toward mass production; recently demonstrated glass-core with co-packaged optics
• SKC / Absolics (Korea): Operating pilot lines; targeting 2027 commercial production
• Samsung Electro-Mechanics (Korea): Advancing glass substrate pilot production
• AGC / Corning (Japan/USA): Glass material suppliers enabling the ecosystem
• Chinese consortium (GCPA members): Coordinating domestic capability building

Industry observers note that glass substrate commercialization remains at an early stage globally. The high technical barriers include:

• TGV drilling at high density without cracking
• Glass metallization (seed layer adhesion to glass)
• Copper filling of high-aspect-ratio glass vias
• Handling ultra-thin glass panels (<300 μm) without breakage
• Cost reduction from current premium to competitive with organic

Timeline and Industry Impact

Commercialization Outlook

What This Means for PCB Professionals

Glass substrates won’t replace standard FR-4 multilayer PCBs. They target the advanced packaging tier — the interposer and substrate layers between silicon chips and the PCB motherboard. However, the technology has ripple effects:

• Board-level design changes: Glass interposers alter the electrical interface between package and PCB
• Assembly challenges: Different CTE behavior affects solder joint reliability at glass-to-PCB interface
• Inspection evolution: New metrology needed for glass substrate quality verification
• Supply chain diversification: Additional substrate technology reduces single-source risk

For PCB designers and manufacturers, glass substrates represent an eventual complement rather than a competitor — the overall system still requires traditional PCB motherboards, backplanes, and flex circuits to connect everything together.

Source: IC&PCB Union and iTGV 2026 Forum proceedings, May 29, 2026.

Image: Claudio Schwarz via Unsplash

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