Glass Liner Inner for Laboratory Vacuum Dewar Flask
High-purity borosilicate glass inner container for cryogenic vacuum Dewar flasks used in scientific labs to store liquefied gases. The inner wall forms the vacuum space with the outer wall for superior insulation. Falls under HTS 7020.00.4000 as glass inners dedicated to vacuum vessels.
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 used as standalone laboratory glassware without vacuum flask assembly
Lab glassware like beakers or flasks not specified as vacuum inners goes to 7017; requires proof of vacuum vessel role.
If constructed from fused quartz/silica for extreme temperature applications
Chapter notes include fused quartz as 'glass'; high-spec Dewar inners may shift to refractory ceramic glass in 6903.
If imported as part of complete lab cryogenic equipment
Machinery parts for temperature-change equipment classify under 8419 when not separately identifiable as glass inners.
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Import Tips & Compliance
• Include lab certification docs proving Dewar flask application to distinguish from general lab glassware in 7017
• Check for thermal shock resistance specs as borosilicate composition affects duty but must match vacuum inner function
• Avoid bulk packing; use individual foam inserts to prevent implosion risks common with thin-walled vacuum glass
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