You know the correct stacked stone HS code is the difference between a clean customs clearance and a container sitting on demurrage at LA/Long Beach. But what most 2026 guides get wrong is that they treat the tariff like a simple lookup table. They give you a number, quote a duty rate, and move on. That works if you are importing a commodity like steel rebar. It does not work for natural stone panels because US Customs does not just validate the HS code; it validates the material science behind the code. Containers have been flagged for weeks because the packing list said ‘stone veneer’ and the CBP lab test showed a cement binder, triggering a full reclassification audit. That is the gap this guide addresses.
My firm works with importers who cut their teeth on Alibaba but now need to protect a five-figure margin on a single 40HQ container. The core issue is not finding the HS code for natural stone ledger panels—that is Google work. The core issue is preventing a misclassification that adds 25% Section 301 tariff you did not budget for, or worse, a shipment hold because your supplier squatted on HTS 6810.99 to avoid the trade war tax. I am going to walk through the specific 10-digit codes for quartzite, slate, and granite, but more importantly, I will show you how to force the correct classification on your supplier’s commercial invoice before the vessel leaves port. That is the only way to ensure your landed cost calculator actually reflects reality.
HTS Chapter 68: Stacked Stone Classification
Natural stacked stone ledger panels from China carry a 6.5% standard duty plus a 25% Section 301 tariff. A 40HQ container at $18,000 CIF lands between $1,170 and $5,670 in duties alone — enough to erase a 5% margin if you misclassify.
You already know the generic answer: stacked stone falls under Chapter 68. But the difference between clearing customs in 24 hours and watching a container sit at Long Beach for two weeks comes down to getting the 10-digit code right and understanding where your supplier is cutting corners. The following walks through the classification logic that actually matters for a bulk FCL order:
- Quartzite / Sandstone / Limestone: HTS 6802.99.0090 — 6.5% standard duty + 25% Section 301 ad valorem tax.
- Granite Ledger Panels: HTS 6802.93.00.90 — 3.7% standard duty + 25% Section 301 ad valorem tax.
- Natural Slate Cladding: HTS 6803.00.5000 — 0% standard duty + 25% Section 301 ad valorem tax layers.
- Cultured / Cement-Based: HTS 6810.99.0000 — 6.5% standard duty, completely exempt from Section 301 surcharges.
Here is where the generic guides fail you. The “cultured stone trap” is real: many Chinese suppliers intentionally classify natural stone panels under HTS 6810 to avoid the 25% Section 301 surcharge. US Customs can and does reclassify shipments on arrival. If your container gets flagged, you face reclassification to 6802.99.0090 plus the 25% tariff, administrative penalties, and demurrage fees that run $200-$400 per day at LA/LB. I have seen a $50,000 container turn into a $68,000 problem because the supplier used the wrong code on the commercial invoice. Always cross-reference the 10-digit code against the official USITC database before booking blocks.
Section 301 Tariffs on Chinese Stone
Natural quartzite ledger panels at CIF $18,000 face $5,670 in total tariffs if Section 301 applies. That’s a 31.5% tax hit on your container cost structure.
The Section 301 tariff is not optional. As of 2026, Chinese stacked stone falls under List 4A, which requires the Chapter 99 subheading 9903.88.15 on the entry summary. This is separate from the standard duty line. Your customs broker files both lines. If the entry summary omits the Chapter 99 code, CBP holds the cargo until you file a post-entry amendment. That process takes 3-5 business days minimum. A distributor I consulted imported 2,400 sq.ft. of “ułożony kamień” classified as 6810. CBP lab-tested the material, found natural calcite and quartz, and reassigned it to 6802.99.0090 plus Chapter 99 9903.88.15, forcing a $4,800 back-duty bill.
However, stacked stone has a hidden advantage that most buyers overlook: the Section 301 loophole for slate. Slate panels under HTS 6803.00.5000 carry a 0% standard duty rate. While they are still subject to the 25% Section 301 tariff, the base duty is zero. A buyer importing slate veneer instead of quartzite reduces the tariff burden from 31.5% (6.5% + 25%) to 25% (0% + 25%). On a $20,000 container, that is $1,300 in savings. But you must ensure the commercial description reads “Natural slate ledger panel” not “Stone veneer panel” — the latter invites reclassification to 6802.99 and the 6.5% duty.
Required Customs Documents for Stone
The documentation requirements for a stacked stone FCL shipment are straightforward but unforgiving. Every FCL shipment of stacked stone needs five core files: a commercial invoice with the 10-digit HTS code and country of origin, a packing list with exact weight in kilograms and piece count per pallet, a bill of lading, a certificate of origin, and a continuous customs bond ranging from $10,000 to $20,000 minimum.
The single biggest documentation failure is the missing “Manufacturing Statement” — US Customs may request evidence proving the panels are natural stone and not concrete-based cultured stone. The standard pack includes a Material Composition Certificate that lists the quarry location, the mineral composition by percentage, and the processing method. Request this from any supplier before shipment. If they cannot provide it, or cannot share third-party checking reports from SGS or Bureau Veritas, you are exposed to a reclassification audit that takes 30-60 days to resolve.
Landed Cost: Duty + Brokerage + Drayage
FOB pricing is a starting point, not a budget finalizer. The true “tissue cost per roll” that hits your P&L includes ocean freight, insurance, and destination port charges. This is where the transparency gap between US-based distributors and factory-direct pricing widens significantly. For a 40HQ container carrying approximately 10,000 square feet of quartzite ledger panels at a CIF value of $18,000, the total duty stack maps out as follows:
- Standard duty (6.5%): $1,170. This is non-negotiable for HTS 6802.99.0090.
- Section 301 tariff (25%): $4,500. Formulated ad valorem on List 4A parameters.
- MPF (0.3464%): ~$600. Capped at max threshold limits securely.
- HMF (0.125%): ~$22.50 flat ad valorem fee metrics.
- Ancillary Charges: Customs broker entry filing ($150-$350) + localized port drayage to warehouse ($400-$700).
That pushes your landed cost per sq.ft. from $1.80 to $2.45 before adding product purchase parameters. If your customer target was $3.60/sq.ft. retail over a $2.50 FOB factory price, miscalculating this duty stack cuts your projected margin down to a thin 12%. Model the full landed fee stack before wiring container down payments.
| Fee Category | Rate / Amount | Calculation Basis | Impact on $18,000 CIF |
|---|---|---|---|
| Standard Duty | 3.7%–6.5% | Ad valorem on CIF value | $666 – $1,170 |
| Section 301 Tariff | 25% | Ad valorem on CIF value (List 4A) | $4,500 |
| MPF (Processing Fee) | 0.3464% (max ~$600) | Ad valorem on CIF value, capped | ~$62 (capped at $600) |
| HMF (Harbor Fee) | 0.125% | Ad valorem on CIF value | $22.50 |
| Customs Broker Fee | $150 – $350 | Flat per entry | $150 – $350 |
| Drayage (Inland Freight) | $400 – $700 | Flat per container | $400 – $700 |
Internal Lab Test: Natural vs. Cultured Stone
One practical test separates experienced buyers from first-timers: the internal lab report proving natural crystalline composition to prevent reclassification audits at the border.
Customs labs frequently test imported stone shipments to confirm core classification properties. Natural stone under HTS 6802 must show a natural crystalline structure under X-ray diffraction (XRD) analysis, whereas cement-based cultured stone under HTS 6810 displays a distinct amorphous structure. Top Source requires an XRD report with every container — it is a simple one-page technical breakdown that proves 100% natural composition and kills any reclassification risk at the border.
Wniosek
Getting your stacked stone HS code right is a direct line to protecting your margin and avoiding demurrage at LA/LB. Whether you classify quartzite under 6802.99.0090 at 6.5% plus 25% Section 301 or slate under 6803.00.5000 duty-free plus that same 25% surcharge, each percent of duty miscalculation cuts into the 5% profit you might be targeting on a 40HQ container. The real risk isn’t the code itself—it’s trusting a supplier’s packing list without verifying material composition, which can trigger a Customs lab hold and a reclassification audit that adds weeks to your lead time.
Before you sign that container contract, confirm your supplier’s 10-digit HTS code, demand a Material Composition Certificate for natural stone, and model your total landed cost including MPF ($600 cap) and HMF (0.125%). We include the correct HTS 6802.99.0090 classification on every export document for our natural quartzite ledger panels—so you can skip the guesswork and focus on scaling your distribution. Check our product specs to see how we remove the customs friction for your next order.
Często zadawane pytania
What is the HS Code 7002390090?
That HS code belongs to glass products, not natural stone. If your supplier uses it for stacked stone, it is a misclassification that will trigger customs delays and penalties. Always request a Chapter 68 code for natural stone shipments.
What is the HS code 6802.93?
HS code 6802.93 covers granite stone products. It only applies if your panels are pure granite; mixed-rock blends must use 6802.99 to avoid misclassification. Confirm the rock composition with your supplier before using 6802.93.
What is the duty rate for slate ledger panels?
Slate ledger panels are duty-free under HTS code 6803.00.5000. However, ensure your material is true natural slate, not cultured stone, to qualify for the zero rate. Verify material classification with your customs broker before shipping.
How can I verify my supplier’s HS code?
Request the exact 10-digit HTS code on the commercial invoice and cross-reference it with US Customs rulings. Misclassification is a top audit risk, so compare the material description to the code’s definitions securely. When in doubt, consult a licensed customs broker before filing entry summaries.
What is a Harmonized Tariff Schedule (HTS) code?
The Harmonized Tariff Schedule (HTS) is the US version of the global HS system used to classify imported goods. It determines the duty rate and regulatory requirements for your stacked stone shipment. Use the correct HTS code to avoid delays and penalties.
