Stainless Steel Vacuum Flask Bottle

The vacuum layer is the heart of any insulated bottle. We have two vacuum machines. One leaves a small tail on the bottom. One leaves no tail. The tailed method costs less. But the tail area can leak over time. The tailless method is more stable. It gives better heat retention. We use the tailless method for most of our products. After vacuuming, we use a heat conductivity tester. Bottles with poor vacuum are pulled out and scrapped. The stainless steel vacuum flask bottle gets the tailless process for long-lasting performance.

We do not just trust the vacuum machine gauges. We also use a high-frequency induction heating device. This device measures temperature change on the bottle wall. A cup with good vacuum transfers heat slowly. A cup with bad vacuum transfers heat fast. We run every single cup through this test. Only the cups that pass move to the next step. This test is more reliable than just measuring vacuum time. We calibrate our test equipment once a year. The stainless steel vacuum flask bottle is individually checked.

This bottle holds 700ml. The inner layer is SUS316 stainless steel. The outer layer is SUS304 stainless steel. It keeps heat for 24 hours at 34°C or more. This long heat retention is good for overnight use. You pour hot water in the evening. The next morning, the water is still warm. We support custom work. The body can get paint or powder coating. For patterns, we do heat transfer, 3D printing, or water stickers. The MOQ is 3000 pieces per SKU. The stainless steel vacuum flask bottle is made for people who need heat to last all day and night.

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