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HTS heading 2506 · Chapter 25

HTS 2506: Quartz

HTS heading 2506 covers quartz (other than natural sands); quartzite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape. It has 3 tariff lines with a duty rate; the general (MFN) rates are Free (3 lines).

Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.

Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.

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Tariff lines and duty rates

HTS codeDescriptionGeneralSpecialColumn 2Estimate
2506.10.00QuartzFreeFree
2506.10.00.10Sands (other than natural) containing by weight 95 percent or more of silica and not more than 0.6 percent of oxide of iron[t]Estimate →
2506.10.00.50Other[t]Estimate →
2506.20.00QuartziteFreeFree
2506.20.00.10Crude or roughly trimmed[t]Estimate →
2506.20.00.80Other[t]Estimate →
2507.00.00.00Kaolin and other kaolinic clays, whether or not calcined[t]Free$2.46/tEstimate →

7 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.

Example: base duty and fees on $10000

For HTS 2506.10.00 at the general rate of Free, shipped by ocean, before any Chapter 99 tariffs:

Base duty (Free)$0.00
Merchandise Processing Fee (0.3464%, min $34.58)$34.64
Harbor Maintenance Fee (0.125%)$12.50
Duty and fees$47.14

Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.

Frequently asked questions

What is the duty rate for HTS 2506?

Heading 2506 has 3 rate lines. The general (MFN) duty rates are Free (3 lines). Products of free trade agreement partners may enter at the special rate, and Column 2 rates apply to countries without normal trade relations. Chapter 99 tariffs can be added on top: calculate the full amount.

Do Section 301, 232 or 201 tariffs apply to HTS 2506?

It depends on the 8- or 10-digit subheading, the country of origin, the entry date and, for Section 232, the metal content. These additional duties are listed in Chapter 99 of the HTS. The free duty calculator checks each program for a given code, origin and date and shows which apply and why.

What fees are added to an import under HTS 2506?

Formal entries pay the Merchandise Processing Fee of 0.3464% of value (minimum $34.58, maximum $670.86 in FY2027). Ocean shipments also pay the Harbor Maintenance Fee of 0.125% of value. See the import duty calculator for how they combine.