U.S. exports of Refractory Cements, Mortars, Concretes & Similar Compositions (HS 381600) totaled $19.4M in August 2026.
Importers of Refractory Cements, Mortars, Concretes & Similar Compositions paid $619K in duties in August 2026, an average duty rate of 6.96% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Refractory Cements, Mortars, Concretes & Similar Compositions imports of $8.9M in August 2026 ran 19% below the year-to-date monthly average of $11.0M.
Last updated: August 2026 dataRefractory cements, mortars, and concretes are heat-resistant bonding and lining materials used in steel furnaces, kilns, incinerators, and other high-temperature industrial equipment. The US tariff schedule distinguishes dolomite ramming mix (3816001000) — a magnesia-based product critical to steelmaking vessel linings — from clay-based refractory cements (3816002010) and other compositions not of heading 3801 (3816002050). Canada is the leading US import source, consistent with its integrated steel and minerals industry, with Austria and Mexico also notable suppliers. Product specifications such as maximum service temperature, alumina content, and bonding chemistry are key commercial and classification parameters.
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614 import shipments a month
Dolomite ramming mix is a magnesia-dolomite-based unfired refractory material applied by ramming or vibration to line basic oxygen furnaces and electric arc furnace vessels. Its classification at 3816001000 depends on the dolomite or magnesia-dolomite composition. Clay-based refractories and other compositions not meeting that mineral profile fall under the remaining lines. Supplier mill certificates identifying the mineralogical composition are the primary classification evidence.
Heading 3816 explicitly excludes products of heading 3801, which covers artificial graphite, colloidal or semi-colloidal graphite, and graphite-based preparations. Refractory compositions with a graphite or carbon matrix as the primary functional component — such as carbon-bonded refractories — may fall under 3801 rather than 3816. The key distinction is whether the refractory character derives from the mineral oxide system (3816) or from the carbon/graphite system (3801).
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Subheading 1 of 1 in heading 3816
Subheading 381600 · $19.4M of $19.4M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3816002050 | Refractory Cements, Mortars, Exc of 3801, NESOI | $7.8M | 7.34% | 55.15% | $574K |
| 3816002010 | Refractory Cements, Mortars, Concretes of Clay | $996K | 3.81% | 17.92% | $38K |
| 3816001000 | Dolomite Ramming Mix | $64K | 10.00% | 100.00% | $6K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3816002050 | Refractory Cements, Mortars, Exc of 3801, NESOI | $16.1M |
| 3816002010 | Refractory Cements, Mortars, Concretes of Clay | $1.8M |
| 3816001000 | Dolomite Ramming Mix | $1.4M |
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
$8.9MYoY · free account
Exports
$19.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $136.7M of Refractory Cements, Mortars, Concretes & Similar Compositions and exported $216.8M.
Through August 2026. Source: U.S. Census Bureau.
Exports · August 2026
destination
Canada and Mexico together take 74% of it.
customs district
origin
entry
rate provision · imports
48.7% enters free of duty; duty collected equals 6.96% of imports for consumption.