Laboratory, Hygienic, and Pharmaceutical Glassware with Low Thermal Expansion (Borosilicate-Type)

Heading 7017.20 is reserved for glass with a measured linear coefficient of expansion at or below 5×10⁻⁶/K across the 0–300 °C range — the technical threshold that characterizes borosilicate compositions. Glassware made from soda-lime or other higher-expansion glass that does not meet this specification falls under heading 7017.90 regardless of its laboratory or pharmaceutical application. Importers should obtain a material data sheet confirming the expansion coefficient.

Importers should check whether any antidumping or countervailing duty orders are active on laboratory glassware from specific countries. Scope determinations in past proceedings have sometimes turned on glass composition and end use, so verifying current order scope with CBP or a trade attorney before entry is advisable, particularly for high-volume shipments.