Product quality inspections are conducted in accordance with standards such as GB/T 29606-2013 (*Stainless Steel Vacuum Cups*) and GB 4806.9-2016 (*National Food Safety Standard: Metal Materials and Articles Intended to Come into Contact with Food*). Common non-compliance issues include deviations in capacity, failure to meet thermal insulation performance standards, and the fraudulent substitution of industrial-grade 201 stainless steel for food-grade 304 or 316 stainless steel in the inner liner.
The use of substandard materials may lead to the leaching of heavy metals, such as manganese and chromium. Furthermore, defects in lid design-particularly after holding food, carbonated beverages, or perishable drinks-can cause the lid to eject forcefully upon opening, resulting in impact injuries, lacerations, or even blindness.
Provincial-level supervisory spot checks conducted in 2024 revealed no non-compliant items; however, in 2018, tests conducted by the Beijing Consumers Association found that 19 out of 50 sampled products failed to meet national standards. In 2025, the U.S. CPSC issued a recall for approximately 850,000 Ozark Trail insulated cups due to the risk of lid ejection; in the same year, Stanley brand stainless steel vacuum insulated cups were recalled, involving 253,695 units.
When purchasing, consumers are advised to verify that the product is explicitly labeled as "suitable for food contact" and specifies the stainless steel grade (e.g., "304" or "316"). Additionally, check the plastic components for any unusual odors and test the lid to ensure it screws on and off smoothly. These cups are not recommended for brewing tea or for the long-term storage of acidic substances such as fruit juice, coffee, carbonated beverages, or milk.