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HSChapter 70
U.S. imports of unworked tubes of fused quartz or fused silica (HS 700231) totaled $7.6M in April 2026, traded with 18 countries.
Importers of Unworked Tubes of Fused Quartz or Fused Silica paid $805K in duties in April 2026 — an effective duty rate of 11% on $7.5M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataFused quartz and fused silica tubes are high-purity industrial intermediates critical to semiconductor diffusion furnaces, UV lamp manufacturing, and laboratory apparatus — applications that demand the material's exceptional thermal stability and low thermal expansion. All US imports of this form fall under a single 10-digit line, 7002310000. Germany leads supply, with China and the United Kingdom also prominent sources, reflecting the specialized capital investment required to produce consistent-diameter, high-purity tubing.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Importers should evaluate whether applicable Section 301 tariffs apply to Chinese-origin fused silica tubes under this heading. The duty impact can be significant given the high unit value of precision fused-silica tubing, so a binding ruling or broker review is advisable before committing to a China-origin supply chain.
Customs may request a manufacturer's material certificate or spectroscopic analysis confirming silicon dioxide purity and the fusion process. Fused quartz and fused silica are classified here (700231), while other low-expansion glass tubes with a linear coefficient not exceeding 5×10⁻⁶ per Kelvin fall under a separate heading (700232). Providing clear compositional documentation at entry avoids reclassification.
Monthly import values over time
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| GERMANY | $6.4M | $772K | -$5.6M |
| CHINA | $254K | $2.9M | +$2.7M |
| MEXICO | $51K | $2.5M | +$2.4M |
| KOREA, SOUTH | -- | $1.8M | +$1.8M |
| UNITED KINGDOM | $313K | $1.5M | +$1.2M |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 7002310000 | TUBES OF FUSED QUARTZ OR OTH FSD SILICA, UNWORKED | $7.6M | 10.78% | $805K |
TUBES OF FUSED QUARTZ OR OTH FSD SILICA, UNWORKED
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7002310000 | TUBES OF FUSED QUARTZ OR OTH FSD SILICA, UNWORKED | $14.4M |
TUBES OF FUSED QUARTZ OR OTH FSD SILICA, UNWORKED
975.1K kg
GLASS ARTICL. FOR CONVEYANCE/PACKING OF GOODS,NESO
HS 701090
TOUGHNED SAFETY GLASS, NOT FOR VEHICULAR USE
HS 700719
OTHER GLASSWARE, NOT LEAD CRYSTAL, NESOI
HS 701399
GLASS WOOL AND ARTICLES OF GLASS WOOL
HS 701980
REAR-VIEW MIRRORS FOR VEHICLES
HS 700910
GLASS MIRRORS, FRAMED, EXC REARVIEW
HS 700992
| State | Imports | Exports | Balance |
|---|---|---|---|
| Georgia | $5.9M | $7.3M | +$1.4M |
| Ohio | $135K | $3.8M | +$3.7M |
| New Jersey | $109K | $2.3M | +$2.2M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| ATLANTA, GA | $2.8M | $1.9M | -$951K |
| CHICAGO, IL | $49K | $3.6M | +$3.5M |
| SAVANNAH, GA | $3.0M | $501K | -$2.5M |