Coffee Cup Tumbler Stainless

The lid is the most important part for preventing leaks. Our product has a two-layer lid. The outer layer is PP plastic. The inner layer is stainless steel or silicone. The seal ring uses food-grade silicone. We pick silicone hardness between 40 and 50 degrees. Harder silicone is hard to tighten. Softer silicone changes shape too easily. We have two seal shapes. One is a flat washer for straight cups. The other is an O-ring for curved cup mouths. After we put the lid together, we do an upside-down test. The product must stay upside down for one hour with no leaks. Only then does it pass.

We have special machines for leak testing. The machine turns the coffee cup tumbler stainless upside down. Then it adds a small amount of pressure. This simulates the cup being squeezed in a bag. The test lasts one hour. After one hour, we check for any water drops. We also do open-close tests. We open and close each lid 500 times. Then we check the seal ring for wear. If a seal ring wears out too fast, we change the material. We improve the seal design every year. Now our leak rate is below 0.1 percent for every product.

The 14oz size is a standard medium coffee. You can use this product at home, in the office, or on the go. The lid seals well, so you can put it in your bag. We make the seal rings from safe materials. They do not give a bad smell to your drink. You can order custom colors and logos for your brand. We test every lid before shipping. Our coffee cup tumbler stainless gives you peace of mind. No leaks, no mess, just good coffee anywhere.

Here are the main technical details for this coffee cup tumbler stainless.

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