Soda calcium glass is harmless to human body, is relatively safe and reliable, mainly composed of calcium oxide, sodium oxide and silicon dioxide, made of daily necessities is a safer product on the market. 1. Calcium oxide: the role of the glass is to increase the mechanical strength and chemical stability of the glass, but should not be higher content, because higher content may lead to glass brittle, easy to break. 2. Sodium oxide: in the glass mainly plays a role in reducing the chemical stability, mechanical strength, and thermal stability of the glass, but also pay attention to the proportion. 3. Silicon dioxide: it is the main substance of the traveling glass, which forms the basis of soda-lime glass, and the thermal stability and chemical stability are provided by silicon dioxide. Soda-calcium glass is less shock-resistant and easier to break, so you must pay attention to safety and avoid scratching when using it.