- April 24, 2022
- Glass and Mirror Products Info
Introduction to Borosilicate 4.0 Flat Glass
Borosilicate glass was originally named “Borosilicate glass 3.3” internationally because its linear thermal expansion coefficient (3.3×10-6K-1) conforms to the ISO 3585 “Borosilicate glass 3.3” standard.
On the basis of borosilicate 3.3 flat glass, borosilicate float glass with a linear thermal expansion coefficient of 4.0×10-6K-1 is further produced, which is called “borosilicate 4.0 flat glass” according to this custom.
Borosilicate 4.0 glass features
1. Low expansion,
2. High-temperature resistance,
3. Corrosion resistance,
4. High mechanical strength, and lightweight for a wide range of applications.
The characteristics of float glass, borosilicate 3.3, and borosilicate 4.0 glass are compared as follows:
Glass Types | Softening Point(℃) | Density(g/cm3) | Coefficient of expansion(×10-6K-1) | Elastic Modulus 103 N/mm2) | Poisson’s ratio |
Borosilicate glass 4.0 | 845 | 2.28 | 4 | 68 | 0.2 |
Borosilicate glass 3.3 | 820 | 2.23 | 3.3 | 63 | 0.2 |
Clear Float Glass | 720 | 2.5 | 9.5 | 68 | 0.4 |
At the same time:
Borosilicate 3.3 and 4.0 have excellent thermal shock resistance and high softening point temperature;
borosilicate 4.0 can generate enough preheating stress to meet the requirements of safety glass; the density is more than 8% lower than traditional soda-lime glass.
After the borosilicate 4.0 flat glass is tempered, a single piece of glass with a thickness of 6mm and above can meet the 3-hour fire test of fire integrity.
So the borosilicate 4.0 flat glass is an ideal material to replace traditional float glass in the field of building fire protection.
Borosilicate 4.0 flat glass has high hardness, close to Mohs hardness level 7 (ordinary float level 6); good wear resistance, under the same load conditions, only a quarter of ordinary glass; strong chemical corrosion resistance, no There is a problem of mildew on ordinary glass.
Therefore, the surface damage of the glass is small and the service life is long.
Eliter Glass Supply and Manufacture Fire Proof Glass.