2026 Full Practical Guide for Stone Blanks Import Agency Customs Clearance at Shanghai Port

2026 Stone Blanks Import Agency: More Than Logistics,It Is A Compliance Game

Many new clients engaged in stone import believe that stone blanks (raw stone blocks) are just ordinary rocks,which can be picked up after shipping and tax payment.However,under the 2026 trade environment,this idea is extremely risky.As frontline operation specialists of Zhongshitong,we must state explicitly that stone blanks import is a "high-priority hidden supervision area" of the customs.It involves not only rigid red lines of animal and plant quarantine,but also big data risk control of customs valuation.Any negligence will lead to port detention of goods,resulting in high container detention charges and storage fees.

Shanghai Port is one of the largest stone import distribution centers across China.It leads the country in customs clearance efficiency,but also implements strict inspection intensity.We not only need to handle conventional documents,but also cope with radioactivity detection,alien soil investigation and price queries.In this article,we will discard impractical theoretical content,directly present the real scenario of 2026 stone blanks import customs clearance,and show you how to safely bring overseas raw stone blocks into China at low cost.

Core Pain Point 1: HS Code Classification and Valuation Logic

The first threshold for stone blanks import often does not come from the customs,but from the enterprise’s own cognition of classification.Many clients are used to classifying all stones under "marble" or "granite",ignoring the definition of "processed" and "unprocessed" in the tariff notes.

Tariff Item Difference Between Raw Stone Blocks and Finished Stone Products

Under the HS Code system,stone blanks are generally classified in Chapter 25 (Natural Stone),while large slabs that have been sawn and polished are classified in Chapter 68.There may be different tariff rates between the two categories,and more importantly,their supervision conditions are completely different.If finished stone slabs under HS 6802 are declared as raw stone blocks under HS 2515,once the customs finds saw marks or cutting traces on the surface during inspection,it will be directly identified as false declaration of HS code,which may lead to risks of document correction,fine and even administrative penalty.

Zhongshitong’s operation suggestion is: before goods shipment,clear photos and full goods description must be provided.For pure raw stone blocks directly mined with all six surfaces remaining natural,we declare them under Chapter 25; for products that have undergone preliminary shaping or cutting overseas,they must be truthfully declared under Chapter 68.Compliance is the lowest-cost customs clearance strategy.

Three Lines of Defense for Customs Valuation

In 2026,the customs valuation system has been fully upgraded to "Big Data + Risk Control Model".Stone blanks are non-standard products,with huge price differences between different mines and different batches,which leaves space for the customs to query declared prices.The customs usually verifies your declared price through three lines of defense:

• First line of defense: Internal network risk parameters. If your declared price is significantly lower than the average price range of the corresponding product name and country of origin,the system will automatically initiate control and transfer to manual document review.
• Second line of defense: Deductive value logic. The customs will calculate the finished product sales price of the stone in the domestic market after import,and deduct reasonable profit,freight and taxes to verify whether your import cost is reasonable.
• Third line of defense: Price negotiation. This is the most challenging part.Once the customs suspects the authenticity of the price,it will issue a price query notice.At this moment,verbal explanation alone is not enough.You must provide foreign exchange payment vouchers,insurance policies,freight vouchers,and even mining certificates from the place of origin and pricing letters from the mine owner.

We once handled a Turkish marble import case,where the customs directly pulled out the declared prices of other goods on the same vessel for comparison.Since we prepared detailed original invoices and mine certificates in advance,which clearly stated the pricing logic of raw blocks of different grades,we successfully passed the price negotiation without supplementary tax payment.

Core Pain Point 2: Statutory Inspection and Radioactivity Detection

Statutory inspection is a necessary procedure for stone import.According to the latest 2026 Import and Export Commodity Inspection Law and its implementing regulations,most natural stones are classified as statutory inspection commodities.This means that you must complete inspection declaration first,and obtain the Imported Goods Customs Clearance Notice before proceeding with customs declaration.

What worries consignees more than statutory inspection is radioactivity detection,which is a special inspection item for the stone industry.During inspection,customs officers will scan the goods with portable radiation detectors.

• Class A Stone: No restriction on application scenarios.
• Class B Stone: Not allowed for interior decoration of buildings,but applicable for exterior decoration of other buildings.
• Class C Stone: Only applicable for scenarios with very limited human access,such as seawalls and bridge piers.
• Over Standard: If radioactivity exceeds the Class C limit,the goods must be returned to the origin.

In our daily operations,Zhongshitong strongly recommends clients to require overseas suppliers to provide local radioactivity test reports before shipment.Although the on-site test result of Chinese customs is the final standard,early risk assessment can avoid huge loss caused by return.If the on-site test value is at the critical point,we will apply for laboratory re-inspection to gain time for technical processing.

Core Pain Point 3: Animal and Plant Quarantine and Wooden Packaging

Stone blanks come from mines,which inevitably carry soil,moss and even insects.These are key targets for national port biosecurity prevention and control.If the customs finds a large amount of soil on the stone surface during inspection,it will determine that the sanitary treatment is unqualified,and require fumigation or destruction,which will generate extra cleaning costs and cause delays.

In addition,wooden packaging (pallets,wooden cases) carrying stone blanks must have valid IPPC marks.In 2026,the customs has implemented unprecedented strict enforcement on wooden packaging without marks or with unclear marks.Once non-compliance is found,the packaging will be destroyed and the consignee will be fined.We usually remind overseas shippers to use qualified wooden cases that have undergone heat treatment or fumigation,or use steel frames and pallets to replace wooden packaging if conditions permit,to eliminate quarantine risks at the source.

Practical SOP for Stone Blanks Agency Import Customs Clearance

Based on the above risk points,Zhongshitong has sorted out a standardized stone blanks import customs clearance process to ensure operation controllability:

• Preliminary Document Review: Check the consistency of certificate of origin,bill of lading,invoice and packing list.Focus on verifying that the issuance date of the certificate of origin is after the shipment date,and the HS code is accurate.
• Document Exchange After Goods Arrival: Exchange bill of lading for Delivery Order (D/O).For telex release bill of lading,confirm that all fees have been settled.
• Inspection Declaration (Declaration Elements): Submit inspection declaration application on the Single Window.The declaration elements must include: product name,processing method (whether sawn),appearance (shape/specification),apparent specific gravity,category (marble/granite etc.).
• Customs Declaration (Valuation Response): Submit the customs declaration form.If valuation risk is predicted,prepare supplementary materials such as price explanation letter,foreign exchange payment receipt,and freight & insurance vouchers in advance.
• Tax Payment: After the customs issues the tax note,the client shall pay the tax within the specified period (usually 15 days),otherwise late payment surcharge will be generated.
• Customs Inspection / Release: In case of inspection,our operation staff will be present on site,cooperate with customs officers to open containers,conduct measurement and radioactivity detection.
• Sanitary Treatment / Goods Pickup: If fumigation or decontamination is required,arrange designated qualified service providers for operation.After completion,pick up the goods and leave the port with the release instruction.

Risk Warning and Pitfall Avoidance Guide

To help you understand potential risks more intuitively,we have compiled a common risk comparison table:

Actual Case Review

Last year,a client Mr.Zhu running high-end stone custom processing business imported a batch of grey wood grain limestone blocks from Portugal.After the goods arrived at the port,the customs system automatically initiated control for two reasons: the declared price was relatively low,and this product name was on the recent risk warning list.

Mr.Zhu was very anxious at that time,as the goods were urgently needed to meet the construction schedule.After taking over the case,we did not make unnecessary appeals to the customs,but immediately retrieved the email communication records between Mr.Zhu and the overseas supplier,and confirmed that the goods were directly purchased from the mine with valid discounts due to overstock of mine inventory.We compiled the translated version of these emails,mine price adjustment letters,and Mr.Zhu’s foreign exchange payment receipts into a complete dossier,and submitted the Price Declaration Statement to the customs.

Meanwhile,we coordinated the inspection site in advance to ensure that the crane equipment was available on site.During inspection,the customs focused on radioactivity detection,and the result was qualified.Finally,on the 5th working day after goods arrival,the customs valuation was approved and the goods were smoothly released.Mr.Zhu not only avoided unnecessary supplementary tax payment,but also caught up with the factory production schedule.This case proves that a professional import agency is far more than handling trivial procedures,but uses professional experience to safeguard clients’ rights and interests at critical moments.

Conclusion

Stone blanks agency import customs clearance seems to be only filling forms and paying taxes,but in essence it is a comprehensive test of policy regulations,customs operation logic and product attributes.In 2026,the compliance-focused year,any fluke mentality may be converted to tangible financial losses.Based in Shanghai and covering global markets,Zhongshitong is fully familiar with every operation detail at Shanghai Port,and can solve complex problems such as off-port declaration and port transshipment through our national interconnected network.If you have stone blanks import business demands,or have doubts about your current declared price,please feel free to contact us for consultation,and we will help you block all risks outside the national port.