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HSChapter 25
U.S. imports of vermiculite, perlite and chlorites, unexpanded (HS 253010) totaled $759K in April 2026, traded with 10 countries.
Importers of Vermiculite, Perlite and Chlorites, Unexpanded paid $66K in duties in April 2026 — an effective duty rate of 10% on $625K in dutiable value, based on actual customs collections rather than the published tariff schedule. Vermiculite, Perlite and Chlorites, Unexpanded imports of $759K in April 2026 ran 57% below the year-to-date monthly average of $1.8M.
Last updated: April 2026 dataUnexpanded vermiculite and perlite are thermally inert minerals that, once heat-treated, expand dramatically into lightweight insulating or horticultural media — but in their raw, unexpanded form they are classified here under 2530100000. Greece is the leading US supplier of unexpanded perlite, reflecting the country's extensive volcanic deposits, with South Africa a major source of raw vermiculite. Importers should note that the 'unexpanded' condition is the classification trigger: material that has already been exfoliated or expanded moves to a different HTS heading, so physical condition at time of import must be clearly documented.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Expanded or exfoliated vermiculite and expanded perlite are classified under different HTS headings than their unexpanded counterparts. If a shipment contains material that has undergone any thermal expansion — even partial — CBP may reclassify it, resulting in a different duty rate and potential penalties for misclassification. Importers should request supplier confirmation that the product is in its natural, unexpanded state and document this on the commercial invoice.
US perlite expansion plants import raw ore to process domestically, supplying the construction insulation, filtration, and horticulture industries. Importing in unexpanded form is economically efficient because expansion increases volume dramatically — shipping expanded material would be far less cost-effective. This processing model means most US perlite imports enter as raw ore under 2530100000 rather than as finished expanded product.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | -- | $553K | +$553K |
| GREECE | $458K | -- | -$458K |
| MEXICO | $119K | $34K | -$85K |
| SOUTH AFRICA | $81K | -- | -$81K |
| KENYA | $59K | -- | -$59K |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2530100000 | VERMICULITE, PERLITE AND CHLORITES, UNEXPANDED | $759K | 10.49% | $66K |
VERMICULITE, PERLITE AND CHLORITES, UNEXPANDED
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2530100000 | VERMICULITE, PERLITE AND CHLORITES, UNEXPANDED | $692K |
VERMICULITE, PERLITE AND CHLORITES, UNEXPANDED
2.4M kg
PORTLAND CEMENT EXCEPT WHITE PORTLAND CEMENT
HS 252329
SULFUR OF ALL KINDS, NOT SUBLIMED,PRECIP,COLLOIDAL
HS 250300
SALT INCL TBL/DENTRD, PURE SODM CHLOR ETC; SEA WTR
HS 250100
UNGRND NAT CAL PHSPH, ALUM CAL PHOS A PHOS CHALK
HS 251010
FLUORSPAR OV 97% OF CALCIUM FLUORD BY WGHT
HS 252922
PEBBLES, GRAVEL ETC. FOR CONCRETE AGGREGATES ETC.
HS 251710
| Port | Imports | Exports | Balance |
|---|---|---|---|
| MOBILE, AL | $275K | -- | -$275K |
| BALTIMORE, MD | $193K | -- | -$193K |
| LAREDO, TX | $119K | $13K | -$106K |