Borosilicate Glass Inner for Thermos Vacuum Flask
This is the inner glass liner made from borosilicate glass designed specifically for use inside thermos vacuum flasks to hold hot or cold liquids. It fits precisely within the outer stainless steel shell, creating the vacuum insulation layer essential for thermal retention. Classified under HTS 7020.00.4000 as a glass inner component for vacuum vessels, not the complete assembled flask.
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 sold as a replacement drinking glass not specified for vacuum use
Glass articles like carafes or bottles for table/kitchen use fall under 7010 unless proven to be inner components for vacuum vessels.
If imported as unfinished glass tubing before final inner shaping
Glass in annealed sheets or profiles prior to working into vessel shape is classified in 7002, per chapter notes excluding pre-annealing processes.
If the complete vacuum flask is imported instead of just the glass inner
Assembled stainless steel vacuum flasks with glass inners are household articles of steel in 7323, not separate glass parts.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Verify the glass is specifically shaped as an inner liner for vacuum insulation to avoid misclassification as general glassware under 7010
• Provide detailed technical specs and diagrams showing vacuum flask compatibility during customs declaration to support HTS 7020.00.4000 classification
• Ensure packaging protects fragile glass from breakage; common pitfall is insufficient cushioning leading to high damage rates in transit
Related Products under HTS 7020.00.40.00
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.
Borosilicate Inner Flask for Coffee Thermal Carafe Vacuum Vessel
Glass inner flask for electric coffee maker thermal carafes, creating vacuum insulation between glass and stainless exterior to keep coffee hot. Precision-molded with handle recess for vacuum vessel integration. Classified in HTS 7020.00.4000 as glass inners for vacuum vessels.
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.
Glass Inner Tube for Portable Vacuum Camping Mug
Thin-walled borosilicate glass inner tube for stainless steel camping vacuum mugs, enabling 24-hour hot/cold retention via vacuum insulation. Features leak-proof lid threading. HTS 7020.00.4000 for glass inners of such portable vacuum vessels.
Replacement Glass Inner for Stanley Adventure Vacuum Bottle
OEM replacement borosilicate glass liner for Stanley stainless steel vacuum bottles, featuring a threaded neck for secure vacuum seal. Designed to maintain beverage temperature through double-wall vacuum insulation. HTS 7020.00.4000 covers such glass inners for consumer vacuum vessels.