Brief Case Analysis of Fused Silica Quartz Viewport-Amy

1. Client Profile

2. Problems of Original Ordinary Glass Window

1. Poor heat resistance: Ordinary glass softens and devitrifies above 300℃, causing blurred vision and frequent replacement.
2. Low light transmittance: Large light loss affects accurate observation of film coating status.
3. Poor thermal shock resistance: Easy to crack under temperature fluctuation, leading to vacuum leakage and production interruption.
4. Impurity precipitation: Metal impurities separate out at high temperature and pollute coating products, reducing finished yield.

3. Optimized Quartz Viewport Solution

• Material: High-purity fused silica quartz, SiO₂ ≥99.995%, continuous operating temperature up to 1100℃.
• Processing: Double-sided mirror clear polishing without flame fog layer, ultra-high UV & visible light transmittance.
• Structure: Custom reserved sealing step edge, flatness and thickness strictly controlled to match equipment flange for stable vacuum sealing.
• Performance: Excellent thermal shock resistance, no cracking under repeated cold-hot cycles; no impurity precipitation in high-temperature vacuum environment.

4. Actual Application Effect

1. Service life increased 7 times compared with common glass, cutting frequent replacement downtime cost.
2. High light transmittance realizes clear real-time observation of internal coating procedure without opening the chamber.
3. Zero vacuum leakage caused by window cracking, greatly stabilizing production consistency.
4. No particle pollution from window material, product reject rate dropped significantly.

5. Conclusion