Introduction of Borosilicate Glass Material
Nowadays there are different glass materials in our daily life. Roughly they are soda-lime glass, crystal glass and borosilicate glass. What do you learn about Borosilicate Glass?
Below let’s introduce this glass material.
From the Wikipedia, Borosilicate glass is a type of glass with silica and boron trioxide as the main glass-forming constituents. It is known for having very low coefficients of thermal expansion ((3.3士0.1)×10-6/K) . It is a kind of special glass material with low coefficients, high temperature resistant, high strength, high hardness, high transparent and high chemical steady.
Below is the Table for G3.3 borosilicate physical and chemical function.
| 含硅量 (Silicon content) | 80 %以上 (above 80%) |
| 应变温度(Strain temperature) | 520 ℃ |
| 退火温度(annealing temperature) | 560 ℃ |
| 软化温度(softening temperature) | 820 ℃ |
| 折射率(refractive index) | 1.47 |
| 透光率（ 2毫米）(light transmittance 2mm) | 92 % |
| 弹性模量(modulus of elasticity) | 76KNmm – 2 |
| 抗张强度(tensile strength) | 40- 120Nmm – 2 |
| 玻璃应力光学常数(Glass stress optical constant) | 3.8 * 10-6平方毫米 (square millimeter) |
| 加工温度（ 104dpas ）(Processing temperature) | 1220 ℃ |
| 线膨胀系数（ 20-300 ℃）(coefficient of linear expansion) | 3.3 * 10-6 K – 1的 |
| 密度（20 ℃）(density) | 2.23gcm – 1 |
| 比热(specific heat) | 0.9jg – 1K的- 1 |
| 导热率(heat conductivity) | 1.2Wm – 1K的- 1 |
| 耐水性能（国际标准化组织719）(Water resistance (International Organization for standardization 719)) | 1级(Grade one) |
| 耐酸性能（国际标准化组织195 ）(Acid resistance (International Organization for standardization 195)) | 1级(Grade one) |
| 耐碱性能（国际标准化组织695）(Alkali resistance (International Organization for standardization 695)) | 2级(Grade two) |
Here we also list the comparison between soda lime glass and borosilicate glass.
| Soda Lime Glass | Borosilicate Glass | |
| Appearance | Smooth with slight die mark | Very smooth without die mark |
| Thickness | 3-4mm | 2mm |
| Bottom thickness | Around 10mm | 2mm |
| Transparent | Common | More transparent |
| Heat resistant | Suggested with cold water | High heat resistant, some can be burned on the fire |
| Layer | Only one layer | Double layer to keeping warm or cold |
| Bottom | With die mark or embossed logo | As thin as the glass side |
| Processing | Machine pressed or machine blown | Hand blown |
| Production | Low unit cost with high MOQ | Small quantity, unit cost is several times |
Conclusion
In summary, borosilicate glass items are more heat-resistant than soda-lime glass, while the cost is quite high also. The most important is that borosilcate glass can be made with colors. Like below:
source: lidaglassware.com
