How glass tableware is made in Firozabad
Most Indian tableware glass is soda-lime glass, melted in pot or tank furnaces and then shaped by mouth-blowing, pressing or press-and-blow machines. Every piece then passes through an annealing lehr, a long oven that cools it slowly so that stress does not lock into the glass. Rims are fire-polished or cut and ground. Decoration follows: enamel paint, decals, gold or platinum bands, frosting and spray colour, each fired or cured on.
Firozabad is the Town of Export Excellence for glass artwares and the Uttar Pradesh ODOP district for glass products, which lists utility glass items alongside décor and bangles. Export volume in drinkware is small: TradeStat shows US$55.87 million for HS 7013 glassware in FY2025-26 (provisional), of which drinking glasses (HS 701328 and 701337) were US$5.50 million. Many factories mainly make décor, so check that a unit has the lehr control and rim finishing that tableware needs.
Two hidden risks lead the checklist. Poorly annealed glass looks perfect and then cracks from hot water, a dishwasher or a knock. And decoration on the top 20 mm of a glass touches the drinker's lips, so its lead and cadmium content matters even though it is on the outside.
What we check on glass tableware
| Check | How it is checked | What fails |
|---|---|---|
| Annealing strain | Sampled pieces viewed between crossed polarising filters (polariscope) | Bright colour bands showing locked-in stress, especially at the base and stem joint |
| Thermal shock screen | Pieces moved from cold water to hot water at the difference set in the buyer's protocol | Cracks or breakage; lab tests use EN 1183 or ASTM C149 methods |
| Rim | Rim run under a finger and viewed at an angle; cut rims checked for grinding | Chips, sharp or rough cut edges, uneven fire polish |
| Glass quality | Pieces viewed against a light and dark background | Stones (unmelted particles), seeds and blisters, cords (visible streaks), inclusions |
| Wall and base | Wall thickness measured at several heights; base checked for thin spots and stability on a flat surface | Thin spots, heavy uneven base, rocking |
| Capacity and fill line | Filled with water to the brim and to any marked line, then weighed or measured | Capacity outside tolerance; fill line in the wrong place |
| Decoration | Colour and decal compared with the tested sample; tape test on paint; position of decoration from the rim measured | Untested colour or decal; paint lifting; decoration in the lip area not covered by the report |
| Matching and sets | Pieces of a set lined up for height, colour tint and rim level | Height or tint differences visible in a set |
Common glass tableware and drinking glass defects and how they are classed
| Defect | Typical cause | Class |
|---|---|---|
| Glass splinter or chip on the drinking rim | Handling, rim finishing | Critical |
| Crack in thermal shock screen | Poor annealing, thin and thick sections together | Critical |
| Strong strain under the polariscope | Lehr too fast or uneven | Major (critical if pieces crack) |
| Lip-and-rim decoration without a passing test | New colour or decal supplier | Critical |
| Stone in the wall | Unmelted batch or refractory | Major: a stress point that can crack |
| Seeds, small cords, slight tint variation | Melting and fining | Minor within the limit sample |
Your defect list decides the final class.
Food-contact and naming rules
- US. Glass that touches food falls under FDA food contact rules; see FDA food contact. ASTM C927 is the method for lead and cadmium extracted from the lip and rim area of glass tumblers decorated outside. In California, decorated glassware is a known Proposition 65 issue, with warning levels set by court settlements.
- EU. Regulation 1935/2004 covers glass; there is no specific EU measure for glass, so Article 3 and national rules apply. See EU food contact and LFGB. Directive 69/493/EEC reserves names such as "full lead crystal", "lead crystal" and "crystal glass" for glass that meets the compositions in its Annex I. Soda-lime glass cannot be sold under those names.
- Canada. Under SOR/2016-175, drinking vessels with exterior decoration within 20 mm of the rim may not release more than 4 mg/L lead or 0.4 mg/L cadmium from the lip and rim area. Glassware with a coating or decoration containing lead or cadmium is also held to the category leach limits.
- Dishwasher claims. Resistance of glass and decoration to dishwashing is commonly tested to EN 12875; a "dishwasher safe" mark needs a report.
Packing and your purchase order
Glass breaks where pieces touch. Each piece should sit in its own cell in a corrugated divider, with top and bottom pads, and stemware should be supported at the bowl and foot. Retail boxes of four or six need inserts that stop movement. The inspector shakes and, where the protocol asks, drop-tests a packed carton and counts breakage.
- Glass type (soda-lime, borosilicate) and forming method; weight, height, diameter and capacity with tolerances.
- Rim finish (fire-polished or cut and ground) and maximum allowed seeds and cords against a limit sample.
- Annealing check and thermal shock difference; dishwasher claim and test.
- Decoration position, colour and decal supplier, and lip-and-rim test for each market.
- Product name: no "crystal" unless the composition qualifies.
For vases, lanterns and decorative glass, see glass décor and artware.
Sources
- DGFT: Appendix 1B, Towns of Export Excellence (Firozabad)
- ODOP Uttar Pradesh: Firozabad glass products
- Canada: Glazed Ceramics and Glassware Regulations (SOR/2016-175)
- Council Directive 69/493/EEC on crystal glass (EUR-Lex)
- Department of Commerce: TradeStat commodity-wise exports (FY2025-26, provisional)