Glass is a very convenient material. It's easy to process. It can be heated to soften. There's no need to add anything strange. Glass recycling is easier than metal recycling. Moreover, under the surface tension, the glass is easy to form a smooth surface. On the other hand, its chemical properties are very stable and its hardness is relatively high, that is to say, it is easy to clean. That is to say, in general, as long as it is not washed and recycled directly, this material should be quite clean. There's no need to worry about the dissolution. It's much safer than stainless steel containers.

PS: the price difference of glass products is actually caused by processing technology. Because the glass is easy to contain small bubbles in the process of processing, or uneven edges lead to stress concentration, uneven thickness and other defects. These defects will greatly reduce the various properties of materials. However, the process difficulty and additional cost needed to eliminate these defects are sometimes more than directly scrapping unqualified products. That's why many glass products are very expensive, but they look similar. It has nothing to do with harm.