The “Birth Story” of a Qualified Stainless Steel Vacuum Flask (7)

A cup with a story, a life with warmth—hello everyone, "Dong Dong's Cup Talk" is here. As the number of followers on my Xiaohongshu account "Dong Dong Talks Cups" has grown, I’ve received more and more inquiries from friends under some of my posts. https://www.zhanyict.com/en/ProductsDetail-VB-10532.htmlAmong these inquiries, I noticed an issue: most people focus on the undesirable aspects of the inner liner of newly purchased vacuum flasks, while rarely asking about the performance of other parts or accessories. Today, I’ll go into detail about what a qualified vacuum flask should look like. Besides quality requirements for the inner liner, what other requirements are there for other parts and accessories? Since there’s a lot to share, I’ll break it down into multiple standalone posts for everyone.

IV. "Keen Eye" Inspection Recommendations

When you receive a new vacuum flask, here’s what you can do:

"Look": In a well-lit area, carefully inspect whether the exterior paint is even and whether the inner liner is smooth, free of black spots, scratches, or paint splatter.

"Smell": Open the lid and take a deep sniff. https://www.zhanyict.com/en/ProductsDetail-VB-10532.htmlAny pungent or unpleasant odor is a sign of substandard quality.

"Feel":

Touch the cup: Run your fingers along the outer wall—it should feel smooth without any rough edges or burrs.

Test the functionality: Open and close the lid multiple times to check for smoothness and rebound. Fill the cup with water, turn it upside down, https://www.zhanyict.com/en/ProductsDetail-VB-10532.htmland check for leaks.

Inspect the accessories: Check the straw, sealing ring, etc., for any burrs or rough edges (excess material).

"Test":

Insulation test: Fill the flask with hot water, tighten the lid, and let it sit for a while. Touch the body and bottom of the cup—if they feel noticeably warm, the insulation performance is poor.

Simple soaking test (use with caution): If you have doubts about the material, https://www.zhanyict.com/en/ProductsDetail-VB-10532.htmlsoak the inner liner in a 1:5 dilution of white vinegar and water or plain water for several hours, and observe whether the color changes abnormally.

This is how a quality-qualified vacuum flask comes to be. If you have any questions about purchasing a vacuum flask, feel free to ask me. https://www.zhanyict.com/en/ProductsDetail-VB-10532.htmlI also hope everyone can find and purchase a high-quality vacuum flask that meets their expectations.