High borosilicate glass and ordinary glass differ in their composition and properties. Here are the key distinctions between the two:

Composition:
High borosilicate glass contains a higher percentage of boron oxide (typically 12-15%) compared to ordinary glass. Boron oxide provides unique properties to the glass, such as higher thermal resistance and chemical durability. Ordinary glass, on the other hand, is primarily composed of silica (silicon dioxide), soda (sodium carbonate), and lime (calcium oxide).

Thermal Resistance:
One of the significant advantages of high borosilicate glass is its exceptional thermal resistance. It can withstand rapid temperature changes without cracking or shattering. High borosilicate glass has a low coefficient of thermal expansion, making it highly resistant to thermal stress. In contrast, ordinary glass has lower thermal resistance and is more prone to thermal breakage under rapid temperature fluctuations.

Chemical Durability:
High borosilicate glass exhibits excellent chemical durability, making it highly resistant to corrosion by acids, alkalis, and other chemicals. It is commonly used in laboratory glassware and industrial applications where resistance to chemical attack is crucial. Ordinary glass is also chemically stable but may be more susceptible to chemical corrosion in certain aggressive environments.

Transparency and Clarity:
Both high borosilicate glass and ordinary glass are transparent materials, allowing light to pass through. However, high borosilicate glass has a higher refractive index, resulting in enhanced clarity and reduced distortion compared to ordinary glass. This property makes high borosilicate glass desirable for applications where optical quality and precision are critical.

Applications:
High borosilicate glass finds applications in various industries, including laboratory equipment, optical components, cookware, and high-end glassware. It is commonly used in products like glass tubes, beakers, microscope slides, and high-temperature glassware. Ordinary glass is more widely used in everyday applications such as windows, bottles, and household glassware.

In summary, high borosilicate glass differs from ordinary glass in terms of its composition, thermal resistance, chemical durability, optical clarity, and applications. High borosilicate glass offers superior thermal and chemical resistance, excellent clarity, and is commonly used in specialized applications that demand high-performance glass materials.