Borosilicate glass

Borosilicate Glass (Also Known as Hard Glass)
Borosilicate glass, also known as hard glass, is manufactured by utilizing the conductive properties of glass at high temperatures. The glass is heated internally to achieve melting and then processed using advanced production techniques. With a thermal expansion coefficient of (3.3 ± 0.1) × 10^-6/K, it is also referred to as "Borosilicate Glass 3.3." This type of glass is primarily composed of sodium oxide (Na2O), boron oxide (B2O3), and silicon dioxide (SiO2). The glass contains high levels of boron and silicon, with boron content ranging from 12.5% to 13.5% and silicon content from 78% to 80%.

Borosilicate glass is a special material characterized by its low expansion rate, acid and alkali resistance, water resistance, excellent corrosion resistance, high temperature resistance, high strength, high hardness, high light transmittance, and outstanding chemical stability. Due to these superior properties, it is widely used in industries such as solar energy, chemicals, pharmaceutical packaging, electric light sources, and craft decorations.

Borosilicate glass has a very low thermal expansion coefficient, approximately one-third that of ordinary glass. This minimizes the impact of temperature gradient stress, enhancing its resistance to breakage. Even with sudden temperature changes, borosilicate glass is less likely to shatter. When it does break, it tends to crack rather than shatter into small particles. Additionally, borosilicate glass has low dispersion and a relatively low refractive index.

Applications:

Borosilicate Glass 3.3

Borosilicate glass 3.3 is widely used across various fields including chemical industry, aerospace, military, household, and healthcare.
1.Household Appliances: Used in oven glass panels, microwave trays, and stove panels.
2.Environmental and Chemical Engineering: Applied as resistant liners, chemical reactors, and safety viewing windows.
3.Lighting: Used as protective glass for spotlights and high-power floodlights.
4.Solar Power Generation: Utilized as substrates for solar cells.
5.Precision Instruments: Employed in optical filters.
6.Semiconductor Technology: Used in wafers and display glass.
7.Medical Technology and Bioengineering

8.Safety and Protection: Used in bulletproof glass.

Material Parameters

Silicon Content	80 %
Strain temperature	520 ℃
Annealing temperature	560 ℃
Softening temperature	820 ℃
Refractive Index	1.47
Transmittance (2 mm)	92%
Elastic Modulus	76KNmm-2
Tensile strength	40- 120Nmm-2
Glass stress optical constant	3.8 * 10-6 cm-2
Processing temperature（ 104dpas ）	1220 ℃
Linear expansion coefficient（ 20-300 ℃）	3.3×10-6/K
Density（20℃)	2.23g/cm3
Specific Heat	0.9jg - 1K-1
Thermal Conductivity	1.2Wm-1K-1

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