7020.00.40.00 - Glass inners for vacuum flasks or for other vacuum vessels

This HTS category, 7020.00.40.00, specifically covers glass inners intended for use in vacuum flasks and other vacuum vessels. These are typically double-walled glass containers designed to maintain thermal insulation through a vacuum between the walls. Examples include the glass inserts for thermoses, travel mugs, and other insulated beverage containers, as well as specialized glass liners for laboratory vacuum apparatus. The key classification criterion is the intended function as a component of a vacuum vessel.

It is important to distinguish this category from its siblings. For instance, 7020.00.30.00 covers specialized quartz reactor tubes for semiconductor manufacturing, which have a distinct industrial application and material composition. The "Other" category (7020.00.60.00) is a residual category for glass articles not specified elsewhere within 7020. While the broader context of Chapter 70 encompasses all glass and glassware, this particular subheading zeroes in on a specific type of glass article based on its specialized function within vacuum insulation technology.

As this is a leaf node within the HTS, there are no further subcategories under 7020.00.40.00. Classification decisions within this category will therefore rely on accurately identifying the product's design and intended use as an inner component for vacuum flasks or vessels, and differentiating it from other glass articles that may appear similar but serve a different purpose or are not designed for vacuum insulation.