How to get the thickness and weight you want?

The Hot water bottles produced by each hot water bottle production plant are not exactly the same, and there are subtle differences. Many customers will put forward specific requirements for the weight and thickness of the hot water bottle. For example, for the same 2 liter capacity, the weight and thickness of the BS standard hot water bottle will be different for each manufacturer. The weight and thickness produced by factory A is 350 grams, and factory B The produced weight is 380 grams.

How is all this achieved? By changing the thickness of the inner core