Thai industrial regulators have issued an immediate shutdown order for Prinx Chengshan Tire (Thailand) Co. in Chon Buri province after inspectors uncovered multiple breaches of Thai Industrial Standards (TIS) certification, product labelling rules and waste-disposal laws. The Industrial Estate Authority of Thailand (IEAT) says the move protects consumer safety and environmental compliance while an in-depth investigation proceeds.
The IEAT’s closure notice followed a joint inspection with provincial officials on 2 August 2025. Officers allege the factory produced tyres without valid TIS approval, altered production dates and removed brand markings from sidewalls, actions that violate Section 21 of Thailand’s Industrial Product Standards Act.
Investigators documented pallets of unmarked tyres destined for export as well as domestic sale. According to the Thai daily Matichon, inspectors seized more than 3,000 units pending laboratory tests. The agency warned that uncertified tyres entering the market could compromise road safety, echoing concerns raised earlier this year when tightening Thai environmental rules on scrap-tyre imports were introduced by the government.
Beyond certification issues, the plant allegedly failed to follow authorised waste-handling procedures for curing bladders and solvent residues, contravening IEAT environmental codes. Similar violations led to fines for a rival producer last December, as covered in Tyre News’ report on crackdowns at Southeast Asian tyre factories.
Prinx Chengshan must now present a corrective action plan, gain fresh TIS clearance and upgrade waste-management systems before operations can resume. If the company satisfies regulators within 90 days, the suspension may be lifted; otherwise, IEAT can recommend licence revocation.
The Chon Buri site opened in 2020 to serve ASEAN markets has capacity for 4 million car and light-truck tyres annually. Analysts note that the halt could tighten supply during Thailand’s peak export season. Prinx Chengshan’s headquarters in China had not issued a public statement at the time of publication.
All factual claims in this article are substantiated by local mainstream media and the official statements from Thai regulators.
This story will be updated when official statements are issued.
Tagged: Prinx Chengshan, Thailand tyre industry, tyre plant closure, IEAT, Thai Industrial Standards, tyre manufacturing compliance, waste disposal violations, Chon Buri, tyre certification, Southeast Asia manufacturing
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