Full Process Analysis and Risk Control Guide for Customs Clearance of Imported Screw Cleaning Materials in Guangzhou

Three Core Challenges for Screw Cleaning Material Import Agency

The inspection rate of chemicals at Guangzhou Huangpu Port increased by 17% year-on-year in 2026,among which screw cleaning materials often trigger customs control due to their complex components.When handling the import of a German brand of cleaning agent last year,we found that the HS code 33079000 declared by the client on their own was seriously inconsistent with the actual function of the product,which almost led to the identification of false declaration.The key to chemical import lies in accurately grasping three dimensions: determination of hazardous characteristics,description of functions and uses,and disclosure of component content.

Chemical Attribute Determination: Dangerous Goods or Ordinary Chemicals?

Three common misjudgment risks for screw cleaning materials: chlorine-containing solvents without GHS classification labeling,failure to declare as hazardous chemicals when flash point ≤60℃,and solid cleaning agents ignoring dust explosiveness.When helping an auto parts factory import Japanese cleaning agents last year,the original factory’s MSDS did not label Class 4.1 hazardous characteristics,but actual testing found that the active components would spontaneously ignite when exposed to air.We recommend taking the following steps:

• Require suppliers to provide the latest Chinese and English versions of MSDS and GHS labels
• Send samples to Guangzhou Research Institute of Chemical Industry for component identification in advance
• Check CAS numbers against the Catalogue of Hazardous Chemicals
• Solid products must be tested for dust dispersion and ignition point

Key Points of Customs Clearance Time Limit Control at Guangzhou Ports

In 2026,Guangzhou Customs implements the "two-step declaration + pre-inspection" mode,and three nodes should be focused on for cleaning agent import:

Practical Case: Port Detention Crisis Caused by Dangerous Goods Misjudgment

In Q4 2025,a batch of screw cleaning agents imported by a Foshan-based injection molding factory from South Korea was detained at Nansha Port.It was declared as ordinary chemicals,but emitted pungent odor during on-site inspection.After we intervened,three problems were found: the supplier labeled toluene-containing solvent as environmental protection formula,the outer packaging had no UN mark,and the Chinese label did not mark hazard statements.

48-hour Emergency Handling Plan

Initiate hazardous characteristic classification and identification immediately,and implement the handling plan simultaneously:

• Contact the Busan factory to obtain the real formula proportion sheet
• Urgent reissue the Import Hazardous Chemicals Business Commitment Letter
• Affix GHS compliant labels in the bonded warehouse
• Coordinate with customs to recognize third-party testing reports

Finally,the port detention time was reduced to 72 hours,avoiding a loss of 32,000 RMB in detention fees.The core lesson revealed by this case is that suppliers in Southeast Asia often simplify MSDS content,so special verification of solvent content and flash point data is required.

2026 Tariff Compliance Optimization Path

Under RCEP,the tariff on Japanese cleaning agents has been reduced from 5.6% to 3.2%,but three conditions must be met: the format of the certificate of origin must be the RCEP version,the goods are transported directly to Guangzhou,and the regional value content of components is ≥40%.The strategy we adopted to help a Japanese-funded enterprise save tariffs last year:

Guide to Avoid Pitfalls in Price Declaration

Three major triggers for customs to initiate price queries on imported cleaning agents: unit price difference under the same HS code exceeding 15%,declared price lower than the industry average,and undisclosed special trade relations.The following measures are recommended:

• Prepare the three-year import price trend chart of the same brand in advance
• List the calculation basis for technical surcharges separately
• Logistics costs from the factory to the terminal must be declared under EXW terms

Special attention: cleaning agents produced in South Korea may trigger anti-dumping investigations.In February 2026,some enterprises had their goods returned because they failed to declare anti-dumping deposits.

National Multi-port Collaborative Service Scheme

Through the linkage of the customs system between the Shanghai headquarters and Guangzhou ports,we have realized two core services: non-local enterprises can complete document pre-review in Shanghai and then carry out transit customs clearance in Guangzhou; for cleaning agents on ASEAN routes,we provide transit pre-inspection services at Singapore/Port Klang.Last year,a Jiangsu-based client reduced the inspection rate of cleaning agents imported from Malaysia from 32% to 9% through this mode.

Holiday Logistics Early Warning Mechanism

The delay rate of shipping schedules on Middle East routes reaches 45% during Ramadan.The following responses are recommended:

• Lock shipping space 20 days in advance and purchase shipping schedule delay insurance
• Arrange arrival time to avoid Muslim festivals at Guangzhou ports
• Reserve a 15-day exchange rate buffer period for letter of credit payment

Special note for 2026 new regulations: value-added tax on imported cleaning agents can be refunded immediately upon payment,but a pollution-free treatment certificate issued by the environmental protection department must be provided.