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HSChapter 70
U.S. imports of unworked glass tubes — low thermal expansion (≤5×10⁻⁶/k) (HS 700232) totaled $1.1M in July 2026, traded with 10 countries.
Importers of Unworked Glass Tubes — Low Thermal Expansion (≤5×10⁻⁶/K) paid $115K in duties in July 2026 — an effective duty rate of 16% on $736K in dutiable value, based on actual customs collections rather than the published tariff schedule. Unworked Glass Tubes — Low Thermal Expansion (≤5×10⁻⁶/K) imports of $1.1M in July 2026 ran 25% below the year-to-date monthly average of $1.5M.
Last updated: July 2026 dataBorosilicate and other technically defined low-expansion glass tubes — those with a linear coefficient of expansion not exceeding 5×10⁻⁶ per Kelvin across 0–300°C — occupy this heading, covering the workhorse material of laboratory glassware, pharmaceutical packaging, and industrial process equipment. Germany and Czech Republic are the leading suppliers, a reflection of Europe's deep borosilicate manufacturing heritage. The single US tariff line, 7002320000, means the thermal-expansion specification is the critical classification boundary separating this heading from both fused-silica tubes (700231) and general glass tubes (700239).
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
57 shipments/mo
The thermal expansion coefficient is typically established by the manufacturer's technical data sheet or a third-party materials test report. CBP may request this documentation to confirm classification under 7002320000 versus the residual glass tube heading. Importers should retain test certificates in their entry records, as post-entry audits in the glass sector sometimes focus on this specification boundary.
Both countries host long-established borosilicate glass producers with vertically integrated operations — from raw batch formulation through precision tube drawing — that supply pharmaceutical, laboratory, and industrial customers globally. Their technical consistency and regulatory compliance documentation (important for pharmaceutical-grade tubing) make them preferred sources for US buyers requiring tight dimensional and chemical tolerances.
Subheading 3 of 5 in heading 7002
Subheading 700232 · $1.1M of $16.8M
Supplier Network
Get discovered by U.S. importers searching for HS 700232 — Unworked Glass Tubes — Low Thermal Expansion (≤5×10⁻⁶/K). Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7002320000 | Tubes of Oth Glass Nes W Lin Coef Ov 5x10-6/Kelvin | $1.1M | 10.55% | 67.67% | $115K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7002320000 | Tubes of Oth Glass Nes W Lin Coef Ov 5x10-6/Kelvin | $334K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$1.1MYoY · Pro
Exports
$334KYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Germany and Brazil together supply 83% of it.
customs district
destination
entry
rate provision · imports
32.3% enters free of duty; the effective duty rate is 10.55%.