7017.20.00.00 - Of other glass having a linear coefficient of expansion not exceeding 5 x 10-6 per Kelvin within a temperature range of 0°C to 300°C

This HTS category, 7017.20.00.00, specifically classifies laboratory, hygienic, or pharmaceutical glassware that is manufactured from glass possessing a low linear coefficient of expansion. The defining characteristic is that this coefficient does not exceed 5 x 10⁻⁶ per Kelvin across a temperature range of 0°C to 300°C. This property signifies exceptional thermal stability, making such glassware suitable for applications involving significant temperature fluctuations without experiencing excessive expansion or contraction, which could compromise accuracy or structural integrity. Examples within this classification include specialized beakers, flasks, distillation apparatus, and precision tubing intended for scientific research, medical diagnostics, or pharmaceutical manufacturing where precise temperature control is paramount.

It is crucial to distinguish this category from its sibling, 7017.10. While both fall under the broader umbrella of laboratory, hygienic, or pharmaceutical glassware, 7017.10 exclusively covers items made of fused quartz or other fused silica. In contrast, 7017.20.00.00 encompasses glassware made from other types of glass, provided they meet the stringent thermal expansion criteria. Therefore, the material composition is the primary differentiating factor between these two classifications.

As this is a leaf node within the HTS structure, there are no further subcategories under 7017.20.00.00. Classification at this level is determined by the specific physical property of the glass (linear coefficient of expansion) and the intended use of the glassware (laboratory, hygienic, or pharmaceutical). Importers and exporters should carefully verify the technical specifications of the glass used in their products to ensure accurate classification.