Unveiling the Insights About Dishwasher Testing for Water Bottle Exports? Part 2

Every cup has a story, and life has its warmth. Hello everyone, and welcome to"Dong Dong's Cup Talk" I’ve previously shared information about dishwasher testing for water bottles. https://www.umbottle.com/ProductsDetail-VB-10529.htmlHowever, as time has passed, advancements in manufacturing processes and updates in testing requirements have made some of the earlier content outdated.

Recently, a friend reached out to me with questions about this topic, so I’ve invited Engineer Li, who has years of expertise in spraying and printing technologies at our factory, to share his insights. https://www.umbottle.com/ProductsDetail-VB-10529.htmlThe following content is based on Engineer Li’s explanations, compiled and organized by me. Due to the depth of the topic, I’ll break it down into several standalone articles. Also, given the volume of information, there might be occasional data inaccuracies in my compilation. If you spot any, please feel free to message me privately, and I’ll make corrections as soon as possible.

### 2. Stainless Steel Cups and Plastic Cups: The "Similarities and Differences" in Testing

Despite their different materials, stainless steel cups and plastic cups endure some of the same "ordeals" in the dishwasher.

Shared "Torture" Items:

- "Scalding" Test: Both must withstand repeated washing and rinsing in hot water at 60-80°C.

- "Chemical Attack": Both need to resist corrosion from dishwasher-specific detergents (with a pH value generally around 10-11, which is highly alkaline).

- "Peeling" Test: https://www.umbottle.com/ProductsDetail-VB-10529.htmlThe adhesion of coatings and patterns is a mandatory check. This involves scoring the surface with a cross-cut tester, applying 3M tape, and then peeling it off to see if anything comes loose.

Different "Sensitive" Areas:

Stainless Steel Vacuum Cups:

The biggest concern is "losing vacuum!" The key is to check whether the vacuum insulation performance remains adequate after 20 testing cycles. I’ve seen cups that look perfectly fine but whose insulation performance dropped significantly—originally able to maintain over 60°C for 6 hours with 95°C water, but only retaining 50°C after testing. https://www.umbottle.com/ProductsDetail-VB-10529.htmlThis indicates damage to the internal structure or seals. Additionally, the coating on stainless steel cups requires greater toughness and adhesion to prevent chipping or peeling from impacts.

Plastic Water Cups (e.g., PP, Tritan):

The main worries are "warping" and "cracking." Plastic tends to soften when exposed to heat, so we closely monitor whether it warps or shrinks. Stress concentration at seams makes them particularly prone to cracking. https://www.umbottle.com/ProductsDetail-VB-10529.htmlFurthermore, it’s essential to test for the leaching of harmful substances like BPA, which is a non-negotiable requirement in European and American markets.