boro3.3 belongs to a kind of fireproof glass. High borosilicate glass is a kind of glass melting by heating in the glass, which is made by advanced production technology, taking advantage of the conductivity of glass at high temperature. High borosilicate glass has very low coefficient of thermal expansion, high temperature resistance, temperature difference of 200 ℃.
boro3.3 has excellent physical and chemical properties. Its silicon content is over 80%. The internal structure of glass is very stable, so it has good mechanical and chemical properties.

Specific physical and chemical properties are as follows:

Silicon content: more than 80%

Strain temperature: 520 ℃

Annealing temperature: 560 ℃

Softening temperature: 820 ℃

Refractive index: 1.47

Transparency (2mm): 92%

Elastic modulus: 67KNmm-2

Tensile strength: 40-120 Nmm-2

Stress optical constants of glass: 3.8xl0-6mm2/N

Processing temperature (104dpas): 1220 ℃

Linear Expansion Coefficient: (20-300 ℃) 3.3 x 10-6K-1

Density: 2.23 GCM-1 (20 ℃)

Specific heat: 0.9Jg-1K-1

Thermal conductivity: 1.2Wm-1K-1

Water Resistance: (ISO 719) Level 1

Acidic resistance: (ISO 195) Level 1

Alkali Resistance: (ISO 695) Level 2

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