Does high borosilicate glass contain lead? Is it poisonous?

- Mar 23, 2020-

The main materials of glass are crystal glass, ordinary glass and high borosilicate glass. Most manufacturers use high borosilicate glass to make high-grade glass. Product materials are high borosilicate glass. We know that glass is generally considered to be the healthiest drinking container due to its stable performance and transparency. However, many people think that high borosilicate glass will lead out in a hot environment. Lead is a toxic substance. right?

High borosilicate glass is particularly excellent in high temperature resistance, high chemical stability, and low expansion rate, so it is widely used in pharmaceutical packaging, craft jewelry, drinking water containers and other product industries. The coefficient of thermal expansion of high borosilicate glass is (3.3 ± 0.1) × 10-6 / K. It is also called “borosilicate glass 3.3. The main component of high borosilicate glass is boron: 12.5 ~ 13.5%, silicon The content is 78 ~ 80%, so the high borosilicate glass has excellent acid resistance and alkali resistance. The strain temperature difference of high borosilicate is 520 ° C. Therefore, high borosilicate does not contain toxic substances, and the high borosilicate resistance High temperature and acid resistance make high borosilicate difficult to precipitate harmful substances to human body in daily drinking water use.

What we need to pay attention to is that it is made by melting lead oxide and silicon together, because after adding lead, the glass will be heavier, more textured, and more thorough. Because the price of lead is relatively high, crystal glass is mostly used to make some craft glass products. Or a premium wine glass. And ordinary glass products are mostly made of high borosilicate.

When choosing a high borosilicate glass, try to choose a glass manufactured by a regular manufacturer. There are not many high-end glass on the market that can use high borosilicate glass, such as Sino glass.