The Birth Story of a Qualified Stainless Steel Insulated Cup (Part Three)

There are stories in the cup, and warmth in life. Hello everyone,"Dong Dong's Cup Talk" is here. With the increase in followers on my Xiaohongshu account "Dong Dong Talks Cups," I have received more and more inquiries from friends in the comments. https://www.zhanyict.com/en/ProductsDetail-VB-10503.htmlHowever, I've noticed a common issue in these inquiries: most people focus on the undesirable aspects of the inner liner of newly purchased insulated cups, while very few raise concerns about other parts or accessories.

Today, I will explain in detail what a qualified insulated cup should look like. Beyond quality requirements for the inner liner, https://www.zhanyict.com/en/ProductsDetail-VB-10503.htmlwhat other standards should be met for other parts and accessories? Since there is a lot of information to share, I will break it down into multiple independent posts for everyone.

3. Performance Requirements

Qualified Standards: Compliance with the national standard GB/T 29606-2013. Under ambient conditions of 20℃±5℃, the cup is filled with 95℃ hot water, the lid is tightly closed, and left undisturbed for 4 hours (6 hours for capacities above 500ml). https://www.zhanyict.com/en/ProductsDetail-VB-10503.htmlThe water temperature should not fall below 42℃ (or a higher standard promised by the brand). Here, I'm just providing an example based on the minimum standard. The specific standards may vary depending on the lid structure and the diameter of the cup opening.

Negative Cases: Extremely poor insulation performance, where the water cools down within just one or two hours. https://www.zhanyict.com/en/ProductsDetail-VB-10503.htmlThis is typically the result of insufficient vacuum levels, poor vacuum sealing processes, or inadequate lid sealing.

4. Plastic Accessory Requirements

Qualified Standards: All plastic components (such as the spout, sealing ring, and inner wall of the lid) should be made of food-grade silicone or PP material (or other food-grade plastics, ensuring they are free from BPA). https://www.zhanyict.com/en/ProductsDetail-VB-10503.htmlThe color should be uniform, with no pungent odors. Edges should be smooth and free of burrs.

Negative Cases: Opening the lid releases a strong "plastic smell." The spout or internal structures have noticeable "flash" (excess thin plastic edges resulting from the injection molding process). https://www.zhanyict.com/en/ProductsDetail-VB-10503.htmlThis not only affects the user experience (posing a potential risk of cuts) but also serves as clear evidence of low-precision production molds and rough post-processing.