How to Avoid Anti-Dumping and Inspection Risks in Plastic Materials Import & Export

The 2026 foreign trade environment presents both opportunities and risks for the chemical plastic industry.As a practitioner who has worked in Shanghai Port for over 20 years,I have witnessed too many plastic materials traders whose goods were detained at the port for months or even faced huge fines due to a single document discrepancy or a slight deviation in HS code classification.Plastic materials are key chemical products under customs supervision,covering multiple chapters such as 3901 to 3915.Their import and export operations are far from simple "filling out documents and shipping".The Zhongshitong team has handled numerous such cases.Today,I will set aside theory and directly dissect core pain points and compliant paths in plastic materials import and export agency operations from a practical perspective.

Precise Classification: Breaking Misconceptions about "Primary Shape"

In the plastic materials import process,HS code classification is the foundation of all operations.Many business owners believe that as long as it is granular plastic,it can be classified under "primary shape" to enjoy lower tax rates.However,in 2026,this logic no longer works in the customs audit center.Customs inspectors will conduct strict determinations based on "monomeric units" and "chemical structures" through laboratory testing.

For example,ethylene polymers and propylene polymers,although similar in appearance,have vastly different tax numbers.If the "monomer content" in the declaration elements is filled in inaccurately,it will easily trigger "classification queries".We once handled an import business of EVA (Ethylene Vinyl Acetate Copolymer) from South Korea.The client habitually declared it under a general tax number,but in fact,this batch had high vinyl acetate content and should be classified under a specific sub-item.Zhongshitong detected this risk during pre-review,required the client to provide detailed component descriptions in advance,and coordinated customs testing,ultimately avoiding subsequent amendment troubles caused by classification errors.

• Declaration Elements Checklist: Product Name,Appearance,Component Content,Monomeric Units,Brand,Model,Purpose,Whether it is recycled material.
• Risk Points: Especially the definition of "recycled material" and "virgin material".If recycled plastic is declared as virgin material,once verified,it will involve serious legal risks of solid waste smuggling.
• Practical Suggestions: For modified plastics,it is necessary to confirm before declaration whether it contains fillers such as flame retardants and plasticizers,which directly determines whether it is classified under "primary shape" or "plastic products".

Anti-Dumping and Certificate of Origin: 2026 Tariff Game

For enterprises engaged in plastic materials import,Anti-Dumping Duty (ADD) is the Sword of Damocles hanging over their heads.At present,China still implements anti-dumping measures for certain polystyrene,polyester chips,etc.originating from the United States,South Korea,Thailand,Taiwan Region,and other places.Once ruled to apply ADD,the tax rate may reach 50% or even higher,directly eroding all profits.

In operations,Zhongshitong not only pays attention to where the goods come from,but also whether the "supporting documents" can withstand scrutiny.Many clients try to evade anti-dumping through third-country transshipment,which has great hidden dangers at the compliance level.The correct approach is to make full use of the RCEP Agreement and other free trade agreements.

In 2026,tariff concessions among RCEP member countries have entered the in-depth implementation stage.If plastic materials are from ASEAN countries,a compliant RCEP Certificate of Origin is a "golden ticket for customs clearance".However,it should be noted that the endorsement information on the Certificate of Origin must be completely consistent with the bill of lading and invoice.We once encountered a batch of imported ABS plastics from Mr.Su.Due to the shipping company’s backdated bill of lading leading to logical contradictions in the date of the Certificate of Origin,he almost failed to enjoy tariff preferences.The Zhongshitong expert team intervened immediately,submitted a statement and relevant guarantee to the customs,and finally retained the zero-tariff treatment at the last moment.

Export Tax Rebate and Regulatory Requirements: Avoiding "Tax Rebate Traps"

For plastic materials export,the core demands of enterprises are often "tax rebate rate" and "exchange collection safety".The tax rebate rate for plastic materials is usually 13%,but the premise is compliant declaration.Customs’ inspection focus on exported plastics is "false declaration of product names",that is,declaring restricted plastic products or waste plastics as ordinary plastic materials for export.

In 2026,the customs’ "risk control system" has been upgraded to the intelligent analysis stage.The system will automatically compare the historical data of export enterprises,the risk level of the destination country,and the commodity unit price.If the declared price is much lower than the average market price in the same period,the system will automatically arrange inspection.This is not the customs deliberately making things difficult,but to prevent tax fraud and low-price dumping.

Zhongshitong advises export enterprises to be sure to prepare the proof chain of "actual transaction price",including contracts,payment vouchers,and waybills.For high-value-added engineering plastics,it is recommended to note "brand authorization" or "patent number" in the remarks column of the customs declaration form,which helps the customs quickly recognize the goods value and accelerate release.

Strategies for Responding to Valuation Risks

Customs valuation is the most common "stumbling block" in plastic materials import and export.When the customs considers that your declared price is below the risk line,it will issue a price query notice.At this time,do not rush to argue verbally; you need to submit professional price negotiation materials.

Practical Case: S-T-A-R Principle Analysis of Rescuing Goods Detained at Port

To help everyone more intuitively understand the value of agency,I share a real case handled by Zhongshitong at the end of 2025 (de-identified).

Scenario: Client Mr.Luo imported a batch of high-transparency PMMA pellets from Japan.After the goods arrived at the port,the customs system randomly arranged inspection and sample testing.At the same time,the customs audit department considered the declared price too low and required a deposit of about 500,000 RMB to release the goods; otherwise,it would be transferred to the anti-smuggling process.

Task: With the port detention costs accumulating daily,prove the rationality of the price,strive to release the goods as soon as possible,and avoid high demurrage charges.

Action: After Zhongshitong took over,it did not directly confront the customs valuer.First,we retrieved the global market price index of this model of PMMA in the past three months and prepared a detailed market research report to prove that this batch’s price was "promotional surplus",which was in line with market logic.Second,we assisted Mr.Luo in obtaining the "defective product judgment certificate" and "special price sales contract" of this batch of products from the Japanese factory,fully explaining the reason for the low price.Finally,we applied for the "classification testing green channel" at Shanghai Port and coordinated the testing center to process the samples first.

Result: The customs accepted our explanation,revoked the price query,and only taxed at the original tax rate.The goods were released smoothly on the 7th day after arrival at the port,saving at least 10 days compared to the normal process,and recovering hundreds of thousands of yuan in demurrage charges and fund occupation losses for Mr.Luo.

Zhongshitong Experts’ Summary: Compliance is the Lowest-Cost Logistics

Plastic materials import and export,seemingly simple transactions,are actually extreme tests of supply chain risk control capabilities.Whether it is anti-dumping evasion at the import end,precise HS code classification,or tax rebate compliance and document risk control at the export end,every link hides mysteries.

As Zhongshitong,we rely on Shanghai’s advantage as a global trade hub,not only providing physical services of customs declaration and inspection,but also providing intellectual support of "compliance consulting + solution implementation".We do not promise "guaranteed customs clearance" because that is illegal; what we promise is "extreme compliant operations based on professional experience".Under the normal state of strict supervision in 2026,only an agent like Zhongshitong who is familiar with the underlying logic of customs and has the ability to link ports nationwide can help you convert uncertain trade risks into controllable logistics costs.