The difference between soda-lime glass and borosilicate glass

Sodium calcium glass and high-boron silicon glass, also known as borosilicate glass, are two different types of glass with distinct properties and applications. Here are some key differences between them:

Composition: Sodium calcium glass is primarily composed of sodium oxide (Na2O) and calcium oxide (CaO), along with silicon dioxide (SiO2). On the other hand, borosilicate glass contains boron oxide (B2O3) in addition to silicon dioxide. The presence of boron oxide in borosilicate glass gives it unique properties.

Thermal properties: Borosilicate glass has a low coefficient of thermal expansion, meaning it can withstand rapid temperature changes without cracking. This property makes it suitable for laboratory glassware, cookware, and other applications requiring resistance to thermal shock. Sodium calcium glass, while still having some thermal resistance, may not have the same level of thermal shock resistance as borosilicate glass.

Chemical resistance: Borosilicate glass is highly resistant to chemical corrosion from acids, bases, and many other chemicals. It is often used in chemical laboratories and industrial settings where resistance to chemical attack is crucial. Sodium calcium glass, although generally chemically resistant, may be less resistant to certain aggressive chemicals compared to borosilicate glass.

Optical properties: Sodium calcium glass exhibits good optical transmission properties, making it suitable for optical applications such as lenses and windows. Borosilicate glass also has good optical clarity, but its primary advantage lies in its thermal and chemical resistance rather than optical properties.

Applications: Due to its excellent thermal shock resistance and chemical durability, borosilicate glass is commonly used in laboratory glassware, cookware, pharmaceutical packaging, lighting products, and various industrial applications. Sodium calcium glass is often employed in optical components, windows, and glass containers where its optical properties are more critical.

In summary, the main differences between sodium calcium glass and high-boron silicon glass (borosilicate glass) lie in their composition, thermal properties, chemical resistance, optical properties, and applications. Borosilicate glass is known for its superior thermal and chemical resistance, while sodium calcium glass is valued for its optical properties.