💎 Lead-free environmental glass is used to form a connection network structure during smelting, and the viscosity increases gradually during cooling.
💎 Outer diameter of the two main tube:28mm；Distance between each two ports: 70mm
💎 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. 💎 boro3.3 high-temperature glass fully conforms to ISO3583 international standard. Because of its low thermal expansion coefficient, it can better withstand higher temperature difference and has good flame processing performance.

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

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