Why only stainless steel water cups can be used as thermos? Can other materials be used as thermos cups?

More than one friend has asked the author about this topic. Today, the author will explain why, but the title is not strict enough in the strict sense, but in order to let everyone understand the author at once, the title is set up like this.

What is a thermos cup?

What is a thermos cup? Are there any strict international requirements for thermos cups?

As the name suggests, a Vacuum Flask is a water cup that preserves the temperature. This temperature represents both heat and cold, which means that the hot water in the water cup can be kept hot for a long time, and the cold water in the water cup can be kept cold for a long time. Internationally, there are definitions and regulations for thermos cups. Pour hot water at 96 degrees Celsius into the cup, seal the lid and let the water cup stand. After 6-8 hours, open the lid and test the water temperature at 55 degrees Celsius. It is a qualified thermos cup. Of course, this regulation was proposed many years ago. With the continuous improvement of production technology and craftsmanship, some thermos cups can even be kept warm for 48 hours through changes in product structure and craftsmanship.

How to make the water cup have good thermal insulation performance?

At present, the global unification is still achieved by the vacuuming process, which is to extract the air in the original double-layer cup body interlayer, so that the interlayer can be imagined as a vacuum state, which acts as a physical phenomenon of rejecting heat conduction, so that the water temperature in the cup will not be lost. so fast. Please note that what the editor said is that it will not drain so fast, because although the wall and bottom of the water cup are in a double-layered vacuum state, the mouth of the cup must be open, and most of the cup lids are not metal. With a vacuum, the heat rises so the temperature is lost from the mouth of the cup.

The vacuuming process needs to be completed in a vacuum furnace. The temperature in the furnace is as high as several hundred degrees Celsius. Obviously, the double-layer water cup made of plastic material will melt and deform at such a temperature. Ceramics can withstand such temperatures, but because the interlayer pressure is higher than the ambient pressure after vacuuming, the ceramics will burst. There are also some materials such as silica gel, glass, melamine, wood (bamboo), aluminum and other materials that cannot be made into thermos for this reason.

Therefore, the qualified metal materials that meet the food-grade requirements and the strength of the metal materials similar to those of stainless steel can be made into thermos cups, and other materials cannot be made into thermos cups.

Auland is a professional stainless steel water cups manufacturer, specializing in providing customers with a complete set of water cup order services, from product design, structure design, mold development, to plastic processing and stainless steel processing.