Of glass having a linear coefficient of expansion not exceeding 5 x10-6 per Kelvin within a temperature range of 0 °C to 300 °C
Low-expansion borosilicate glassware for table, kitchen, or office use
HSN 7013 42 00 (glassware with a linear coefficient of expansion not exceeding 5 × 10⁻⁶ per Kelvin, 0 °C to 300 °C) is not covered by a Bureau of Indian Standards Quality Control Order and carries no Partner Government Agency clearance requirement at the tariff-line level. Import follows the standard customs procedure: Importer-Exporter Code, bill of entry, commercial invoice, packing list. Other glassware falling under heading 7013 — particularly drinking glasses and tempered or laminated glass articles — may be classified under sibling tariff lines within Chapter 70 that do carry compliance obligations.
The thermal-expansion specification at this tariff line is narrow; a mismatch between the declared coefficient and the tested product value is the principal classification risk. Customs re-classification to a sibling line within Chapter 70 — for instance, ordinary soda-lime glassware without the low-expansion criterion — triggers retrospective compliance and potential detention pending verification. Importers should obtain a manufacturer's technical data sheet confirming the coefficient of expansion before filing the bill of entry.