Analysis on Guangzhou Sealing Ring Import Customs Clearance Process and Common Difficulties

I.Market Background and Core Difficulties of Sealing Ring Import in Guangzhou

Since 2026,domestic industries such as new energy vehicles,high-end hydraulic equipment and aerospace have continued to expand,and the annual growth rate of demand for imported high-end sealing rings has exceeded 15%.As the core import port in South China,Guangzhou receives more than 200 containers of sealing rings every month,among which fluororubber and silicone rubber sealing rings imported from Germany and Japan account for the highest proportion.However,many manufacturing enterprises are often caught in the following dilemmas when importing because they are not familiar with the unique compliance requirements for sealing rings:

• Unqualified material testing: Guangzhou commodity inspection authority added the "electrolyte compatibility test for new energy battery sealing rings" in 2026,and some enterprises have their declarations rejected due to failure to prepare relevant reports in advance
• Incorrect tariff classification: The tariff rate difference between high-temperature sealing rings and ordinary sealing rings is up to 8%,and classification errors will lead to tax payment supplementation and penalties for false declaration
• Delay caused by missing documents: For sealing rings used for special equipment,an additional Safety Performance Certificate is required,and more than 30% of enterprises suffer port detention for over 7 days due to omission of this document

II.Core Role of Zhongshen in Guangzhou Sealing Ring Import

Zhongshen has been engaged in foreign trade agency for more than 20 years,and has set up an exclusive service team for the sealing ring import business at Guangzhou Port.All team members are familiar with the latest customs tariff notes and commodity inspection standards,and can accurately meet the compliance requirements of sealing rings of different materials and uses.For example,for shield machine sealing rings imported from Germany,the team can coordinate with suppliers in advance to supplement special equipment certification documents; for food-grade sealing rings imported from Japan,they can quickly connect with third-party testing institutions designated by the commodity inspection authority.

III.Process Breakdown and Exclusive Services for Guangzhou Sealing Ring Import Customs Clearance

1.Document Pre-review Stage: Avoid Material and Qualification Risks

In 2026,Guangzhou Customs shifted the focus of document review for sealing rings from "formal compliance" to "substantive compliance".The exclusive documents required include:

• Material analysis report issued by a third-party institution (key parameters such as fluorine content,temperature resistance range and sealing pressure shall be clearly stated,such as German TUV and Swiss SGS certifications)
• Certificate of origin (for products eligible for FTA tariff rates,such as sealing rings from Germany and Japan,FORM A or FORM E shall be provided)
• For sealing rings used for special equipment,an additional Safety Performance Certificate for Imported Special Equipment Components shall be provided

Zhongshen’s support at this stage: Connect with customers 10 working days in advance to check the parameter consistency of all documents.At the end of 2025,the electronic manufacturing enterprise where Ms.Li works imported a batch of food-contact silicone sealing rings from South Korea,and was required to conduct supplementary testing by Guangzhou commodity inspection authority because the "food-grade certification number" in the material report was blurred.The Zhongshen team found this problem during the pre-review,assisted the customer to contact the South Korean supplier to reissue a report with a clear number,and avoided port detention after the goods arrived at the port.

2.Port Customs Declaration Stage: Accurately Match Tariff Rates and Declaration Logic

In 2026,Guangzhou Customs adjusted the tariff classification of some sealing rings.For example,high-temperature sealing rings resistant to temperatures above 1200℃ are classified under the low-tariff HS code 8484100000 with a tariff rate of 5%,while ordinary sealing rings are still subject to an 8% tariff rate.If enterprises only make a general declaration of "sealing rings",they are very prone to classification errors.

Zhongshen’s support: Before customs declaration,accurately match the HS code according to the parameters of the sealing ring such as material,purpose and temperature resistance range,combined with the latest customs tariff notes.In March 2026,the hydraulic equipment enterprise where Mr.Tang works imported a batch of 1200℃ high-temperature sealing rings from Germany.The Zhongshen team compared the definition of "high-temperature sealing parts" in the tariff notes,classified them under the low-tariff code,and saved the enterprise about 120,000 yuan in tariffs.

3.Commodity Inspection Link: Focus on Sealing Performance and Environmental Compliance

The key testing items for sealing rings by Guangzhou commodity inspection authority include: temperature resistance test,sealing performance test,and heavy metal content (lead,cadmium,mercury,etc.) as required by the RoHS directive.Since 2026,the "expansion rate test after electrolyte immersion" requirement has been added for new energy vehicle battery sealing rings,and unqualified products will be forcibly returned.

Zhongshen’s support: Connect with the designated testing institution of Guangzhou commodity inspection authority in advance,and prepare samples and test plans.In April 2026,the new energy enterprise where Mr.Qiao works imported battery sealing rings from Japan.The test report provided by the supplier did not cover electrolyte compatibility,so Zhongshen assisted in contacting a local laboratory to conduct supplementary testing.The commodity inspection was completed in only 2 working days,saving 5 days compared with the enterprise handling it on its own.

IV.Actual Case: Zhongshen Helps Avoid Port Detention Risks

In May 2026,the shield machine manufacturing enterprise where Mr.Mei works imported a batch of 3-meter-diameter main sealing rings for shield machines from Germany,with a total value of about 500,000 yuan.Before the goods arrived at the port,the enterprise only prepared commercial invoices and packing lists,and did not realize that the sealing rings for shield machines are special equipment components requiring a Safety Performance Certificate.

The Zhongshen team found this missing document during the pre-review,immediately connected with the German supplier,assisted it in applying for the certificate from the local special equipment certification authority,and communicated with Guangzhou Customs simultaneously to explain the urgency of the batch of sealing rings for the extension project of Guangzhou Metro Line 18.Finally,the enterprise completed the supplement of all documents within 3 days after the goods arrived at the port,and cleared customs smoothly,avoiding port detention fees of about 2,000 yuan per day (port detention fees at Guangzhou Port increase day by day,and additional storage fees are required for detention exceeding 7 days).

V.Self-declaration vs Zhongshen Agency: Comparison of Core Differences

VI.Summary: Core Value of Professional Agency

Guangzhou sealing ring import involves multiple professional links such as material testing,tariff classification and special equipment certification,and enterprises handling it on their own are prone to delays or penalties due to information asymmetry.Relying on 20 years of industry experience,Zhongshen’s exclusive services for sealing rings can realize: avoiding document risks in advance,accurately matching low tariff rates,and completing commodity inspection and testing quickly.Finally,it helps enterprises shorten the import cycle from 20 days to less than 10 days,reduce comprehensive costs by more than 30%,and ensure stable supply of core components for production.