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U.S. exports of refractory nonconstructional ceramic goods — other (retorts, muffles, nozzles, plugs, etc.) (HS 690390) totaled $20.5M in July 2026.
Importers of Refractory Nonconstructional Ceramic Goods — Other (Retorts, Muffles, Nozzles, Plugs, etc.) paid $893K in duties in July 2026 — an effective duty rate of 12% on $7.4M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataRefractory process components that do not qualify under the alumina/silica or free-carbon thresholds of other headings — including clay-based and specialty nonclay compositions such as silicon carbide, magnesia, or zirconia shapes — are captured here. The US schedule divides the heading between clay goods (6903900010) and nonclay goods (6903900050), making material composition the decisive classification factor. Mexico and Japan are the leading suppliers, with Germany and the United Kingdom also prominent, reflecting the engineering ceramics expertise concentrated in those markets. Silicon carbide kiln furniture and specialty nozzles for glass and ceramics processing are commercially significant product types within this heading.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
504 shipments/mo
Silicon carbide kiln furniture (setters, saggers, beams, and posts) generally classifies under 6903.90 as nonclay refractory nonconstructional ceramic goods (6903900050), provided the article is not predominantly carbon by weight (which would place it in 6903.10) and is not a constructional shape. The nonclay line captures SiC and other non-alumina/silica-dominant compositions used as process support equipment in ceramics and electronics firing.
Customs may request a material composition certificate or laboratory analysis confirming whether the refractory article is clay-based (phyllosilicate minerals such as kaolinite, ball clay, or fireclay) or nonclay (SiC, magnesia, zirconia, etc.). Supplier-issued material data sheets specifying mineralogical composition and firing temperature are the standard supporting documents. Retaining these records is advisable given that the clay/nonclay split affects both classification and, potentially, applicable trade-remedy exposure.
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Subheading 2 of 3 in heading 6903
Subheading 690390 · $14.3M of $32.5M
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 |
|---|---|---|---|---|---|
| 6903900050 | Oth Refractory Ceramic Goods NESOI, Nonclay | $13.9M | 6.21% | 51.48% | $864K |
| 6903900010 | Oth Refrac Ceram Gds NESOI of Clay | $395K | 7.54% | 67.37% | $30K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 6903900050 | Oth Refractory Ceramic Goods NESOI, Nonclay | $18.6M |
| 6903900010 | Oth Refrac Ceram Gds NESOI of Clay | $1.9M |
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
$14.3MYoY · Pro
Exports
$20.5MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Mexico and Canada together take 65% of it.
customs district
origin
entry
rate provision · imports
48.0% enters free of duty; the effective duty rate is 6.25%.