9902.14.77 - Discs of drawn glass, each measuring between 1.4 m and 1.7 m in diameter, between 40 and 50 mm in thickness and between 200 and 250 kg in weight, the foregoing having been machined so as to render one surface concave in shape and the opposite surface convex in shape, the foregoing not framed or fitted with other materials and not designed to manipulate light to create an optical effect (provided for in subheading 7006.00.40)

This HTS code, 9902.14.77, pertains to a highly specific type of glass disc. It is defined by stringent physical parameters: a diameter between 1.4 and 1.7 meters, a thickness of 40 to 50 millimeters, and a weight between 200 and 250 kilograms. Crucially, these discs are manufactured from drawn glass and have undergone machining to create opposing concave and convex surfaces. They are imported in an unfinished state, neither framed nor fitted with other materials, and are not intended for light manipulation to produce optical effects. The classification within Chapter 99 indicates that these goods are subject to temporary legislation or modifications.

As a specialized provision within Chapter 99, this category is distinct from the broader commodity classifications found in earlier chapters of the HTS. For instance, while other glass products might fall under Chapter 70, this particular code signifies a temporary or specific import treatment rather than a standard classification of finished optical glass or common glass articles. The unique combination of size, weight, machining, and intended non-optical application sets these discs apart from general glass products and differentiates them from materials classified for other purposes or with different physical characteristics.

Since 9902.14.77 is a leaf node, there are no further subdivisions within this specific HTS code. Its purpose is to uniquely identify and manage the import of these exceptionally large, specifically machined glass discs under temporary legislative provisions. Classification professionals should rely on the precise physical and functional descriptions outlined to ensure accurate application of this temporary tariff provision, noting its reference to subheading 7006.00.40 as a contextual basis for its prior or standard classification.