You might not realize that the safety of every electronic device — from smartphones to AI servers — begins deep within its printed circuit board (PCB).

At KNOWNPCB, with over 17 years of PCB manufacturing experience, we understand two key safety parameters that define PCB reliability:Flammability Rating (UL94 V-0) and CTI (Comparative Tracking Index).These determine whether your device stays safe under stress.

• The Evolution of PCB Fire Resistance

In the early days of PCB fabrication, paper-based PCBs (94HB) were common — they were inexpensive but easily flammable.

As electronics became smaller and more powerful, the demand for flame-retardant PCB materials increased.This led to the development of V-0 rated FR-4 laminates, which are flame retardant, robust, and glass-fiber reinforced.

At KNOWNPCB, all materials are UL94 V-0 certified, ensuring compliance and long-term reliability for every PCB layer.

• What the CTI Index Means for PCB Safety

Imagine fine dust or moisture accumulating on a circuit board.The Comparative Tracking Index (CTI) measures a material’s ability to resist Surface electrical tracking that could cause short circuits or fires.

         •High CTI (≥ 600) = excellent insulation under high voltage and harsh conditions.

         •Low CTI (< 175) = more likely to form conductive paths over time.

        Our custom PCB manufacturing process always includes CTI evaluation to guarantee durability even in extreme environments.

• Real-World Case Study – EV Charger Prototype

A European client once approached KNOWNPCB for an EV charger PCB prototype.The initial board failed due to carbonized tracking during high-voltage testing.

After switching to high CTI and UL94 V-0 laminates, and completing 1,000-hour endurance tests, the revised PCB passed with zero failures — ready for mass production.

This case highlights how the right materials and manufacturing expertise ensure both safety and reliability.

• How KNOWNPCB Builds Reliability into Every Board

Every PCB we manufacture follows a strict quality control process:

         •Careful selection of UL94 V-0 and high CTI laminates

         •Advanced HDI PCB manufacturing technology

         •Automated inspection systems for precision

         •Fast turnaround from prototype to production

• The Future of Safer PCB Manufacturing

As electronics become smaller, faster, and denser, the safety bar will continue to rise.
       Next-generation PCB manufacturing will focus on High Tg, Halogen-free materials, and eco-friendly production.

At KNOWNPCB, we continuously upgrade our equipment and engineering standards to deliver high-performance, sustainable PCB solutions.

• Conclusion – Reliability Starts with the PCB

A well-designed PCB is the foundation of every safe, reliable device.
       While flammability and CTI may sound technical, they ultimately represent trust, performance, and user safety.

KNOWNPCB, your dedicated PCB manufacturer, is ready to help you build your next innovation — safely and efficiently.

Operations Center

Add: Bldg D,Liantangkeng Industrial Area,Qianjin Road,Xixiang Street,Bao'an Dist.,Shenzhen City,Guangdong Province,518102,China.

Tel: +86 755 2794 4155

Fax: +86 755 2794 4159

E-mail: sales@knownpcb.com