Quartz Glass Inner for Industrial Vacuum Reaction Vessel
Fused quartz glass inner cylinder for high-temperature industrial vacuum reaction vessels used in chemical processing. Provides chemical resistance and vacuum integrity under extreme conditions. HTS 7020.00.4000 includes such glass inners per fused silica definition in chapter notes.
Import Duty Rates by Country of Origin
| Origin Country | MFN Rate | Ch.99 Surcharges | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | 6.6% | +35.0% | 41.6% |
| 🇲🇽Mexico | 6.6% | +10.0% | 16.6% |
| 🇨🇦Canada | 6.6% | +10.0% | 16.6% |
| 🇩🇪Germany | 6.6% | +10.0% | 16.6% |
| 🇯🇵Japan | 6.6% | +10.0% | 16.6% |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as refractory fused silica articles for furnaces
High-temp (>1500°C) quartz shapes for industrial furnaces shift to 6903 refractories, not glass inners.
If for parts of complete chemical reactor vacuum equipment
Machinery parts unsuitable for separate use go to 8419 lab/chemical reactor headings.
If other glass article not specifically vacuum inner
General other glass articles fall in 7020.00.60; vacuum flask inners uniquely specified in .40.
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Import Tips & Compliance
• Include chemical resistance certs and vacuum rating specs to justify 7020 over general lab glass in 7017
• Fused quartz qualifies as glass per chapter notes but declare silica purity to avoid refractory classification
• Package in cleanroom conditions; contamination voids industrial certification and triggers re-inspection
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