7007.21 - Of size and shape suitable for incorporation in vehicles, aircraft, spacecraft or vessels:

This HTS category, 7007.21, encompasses laminated safety glass specifically designed for integration into vehicles, aircraft, spacecraft, or vessels. It includes glass that has been manufactured through a process where one or more layers of glass are bonded together with an interlayer, typically polyvinyl butyral (PVB), to enhance its safety characteristics. Upon breakage, laminated glass tends to fracture into large, relatively harmless pieces, adhering to the interlayer rather than shattering into dangerous shards.

This classification distinguishes itself from sibling category 7007.29 by its specific construction; 7007.29 covers "other" laminated safety glass not meeting the size and shape criteria for incorporation into vehicles, aircraft, spacecraft, or vessels. Therefore, the defining characteristic for inclusion here is the intended application and resulting dimensions and shaping suitable for these modes of transport.

Within this category, further subdivisions exist to refine classification. Subcategory 7007.21.11 specifically addresses laminated safety glass intended for use as windshields. The remaining laminated safety glass, suitable for transport applications but not specifically windshields, falls under subcategory 7007.21.51.00. These distinctions allow for more precise tariff application based on the specific component of the vehicle, aircraft, spacecraft, or vessel the glass is designed to be a part of.