Unveiling the Tests Conducted on Vacuum Flasks Before Leaving the Factory: Part Four

There are stories in every cup, and warmth in every life. Hello everyone, "Dong Dong's Cup Talk" is here! Today, we've invited Minister Li Hang from our factory's Quality Inspection Department to talk about the tests that stainless steel vacuum flasks undergo before leaving the factory. https://www.umbottle.com/ProductsDetail-VB-10503.htmlThe following content is based on Minister Li's narration and has been compiled by me. Due to the extensive content, I will share it in multiple parts.

Hello everyone, I'm Li Hang. I've been working in quality inspection at this factory for fifteen years. Over these years, I've led my team in testing millions of cups, from orders for major domestic supermarkets to stringent projects exported to Europe, America, Japan, and South Korea. https://www.umbottle.com/ProductsDetail-VB-10503.htmlAlmost every day, I deal with data related to salt spray, drop tests, and thermal insulation performance. At the same time, I'm also a mother of a six-year-old boy. Every day, when I prepare warm water for my child to take to kindergarten, what concerns me most, just like you, is whether the cup is truly safe, durable, and healthy.

Today, I want to take you behind the scenes of the "graduation ceremony" that every vacuum flask must undergo before leaving the factory, https://www.umbottle.com/ProductsDetail-VB-10503.htmlsharing my insights both as a professional and as a mom.

4. Cross-Cut Test and Dishwasher Test – Evaluating the "Adhesion" and "Durability" of the Paint Finish

- Cross-Cut Test:

A grid of 100 small squares, each 1mm×1mm, is carefully cut into the paint finish using a precision blade. https://www.umbottle.com/ProductsDetail-VB-10503.htmlSpecialized adhesive tape is firmly applied and then ripped off abruptly. The requirement is that the paint peeling rate must be less than 5%.

- Dishwasher Test:

The cup is placed in a dishwasher and subjected to multiple (e.g., 20) complete high-temperature wash and dry cycles. https://www.umbottle.com/ProductsDetail-VB-10503.htmlAfter testing, the paint finish must not show signs of fading, discoloration, blistering, or peeling.

Practical Case:

- Export Orders to Europe and America:

Dishwashers are extremely common in households in Europe and America, so "passing the dishwasher test" is a mandatory requirement. https://www.umbottle.com/ProductsDetail-VB-10503.htmlWe once handled an order for an American brand that required us to provide a third-party dishwasher test report, with the number of cycles as high as 200.

Mom's Advice:

If you regularly use a dishwasher, make sure to look for the "Dishwasher Safe" label on the packaging when purchasing a vacuum flask. https://www.umbottle.com/ProductsDetail-VB-10503.htmlIf it’s not indicated, to preserve the cup’s appearance and longevity, handwashing is highly recommended.