1.ultra clear glass has much lower glass self explosion ratio
Definition of self-explosion: The self-explosion of tempered glass is a shattering phenomenon that occurs without external force.
The starting point of the explosion is the center and spreads radially to the surrounding. At the starting point of the self-explosion, there will be two relatively large fragments with the characteristics of "butterfly spots".
Reasons for self-explosion:
The self-explosion of tempered glass is often caused by the existence of some tiny stones in the original sheet of tempered glass. The high temperature crystalline state (a-NiS) is "frozen" during glass production and kept at ambient temperature. In tempered glass, since this high-temperature crystalline state is not stable at room temperature, it will gradually transform to the normal-temperature crystalline state (B-NiS) with time, and it will be accompanied by a certain volume expansion (2~4% expansion) during the transformation. ; If the stone is located in the tensile stress area of the tempered glass, this crystal phase transformation process often causes the tempered glass to break suddenly, which is what we usually call the self-explosion of the tempered glass.
Self-explosion rate of ultra clear tempered glass:
Because ultra clear glass uses high-purity ore raw materials, the impurity composition is reduced to a minimum, and the corresponding NiS composition is also much lower than that of ordinary float glass, so its self-explosion rate can reach within 2 ‱,around 15 times lower comparing with 3‰ self-explosion rate of ordinary clear glass.
2. Color consistency
Since the iron content in the raw material is only 1/10 or even lower than that of ordinary glass, ultra-clear glass absorbs less green wavelength in visible light than ordinary glass, ensuring the consistency of glass color.
3. ultra clear glass has higher transmittance and solar coefficient.
ultra clear glass parameter |
|||||||||||||
Thickness |
transmittance |
Reflectance |
solar radiation |
shading coefficient |
Ug |
soundproofing |
UV transmittance |
||||||
direct penatrating |
reflecting |
absorptivity |
total |
shortwave |
longwave |
total |
(W/M2k) |
Rm(dB） |
Rw（dB) |
||||
|
2mm |
91.50% |
8% |
91% |
8% |
1% |
91% |
1.08 |
0.01 |
1.05 |
6 |
25 |
29 |
79% |
|
3mm |
91.50% |
8% |
90% |
8% |
1% |
91% |
1.05 |
0.01 |
1.05 |
6 |
26 |
30 |
76% |
|
3.2mm |
91.40% |
8% |
90% |
8% |
2% |
91% |
1.03 |
0.01 |
1.05 |
6 |
26 |
30 |
75% |
|
4mm |
91.38% |
8% |
90% |
8% |
2% |
91% |
1.03 |
0.01 |
1.05 |
6 |
27 |
30 |
73% |
|
5mm |
91.30% |
8% |
90% |
8% |
2% |
90% |
1.03 |
0.01 |
1.03 |
6 |
29 |
32 |
71% |
|
6mm |
91.08% |
8% |
89% |
8% |
3% |
90% |
1.02 |
0.01 |
1.03 |
6 |
29 |
32 |
70% |
|
8mm |
90.89% |
8% |
88% |
8% |
4% |
89% |
1.01 |
0.01 |
1.02 |
6 |
31 |
34 |
68% |
|
10mm |
90.62% |
8% |
88% |
8% |
4% |
89% |
1.01 |
0.02 |
1.02 |
6 |
33 |
36 |
66% |
|
12mm |
90.44% |
8% |
87% |
8% |
5% |
88% |
1.00 |
0.02 |
1.01 |
6 |
34 |
37 |
64% |
|
15mm |
90.09% |
8% |
86% |
8% |
6% |
87% |
0.99 |
0.02 |
1.00 |
6 |
35 |
38 |
61% |
|
19mm |
89.73% |
8% |
84% |
8% |
7% |
86% |
0.97 |
0.02 |
0.99 |
6 |
37 |
40 |
59% |
4. ultra clear glass has lower UV transmittance
|
clear glass parameter |
|||
Thickness |
transmittance |
Reflectance |
UV transmittance |
|
2mm |
90.80% |
10% |
86% |
|
3mm |
90.50% |
10% |
84% |
|
3.2mm |
89.50% |
10% |
84% |
|
4mm |
89.20% |
10% |
82% |
|
5mm |
89.00% |
10% |
80% |
|
6mm |
88.60% |
10% |
78% |
|
8mm |
88.20% |
10% |
75% |
|
10mm |
87.60% |
10% |
72% |
|
12mm |
87.20% |
10% |
70% |
|
15mm |
86.50% |
10% |
68% |
|
19mm |
85.00% |
10% |
66% |
5. ultra clear glass has higher production difficulty,thus cost is higher than clear glass
Ultra clear glass has high quality requirements for its ingredients quartz sand, also include the high requirements for iron content,natural ultra-white quartz sand ore is relatively scarce, and ultra clear glass has relatively high technological content, making production control difficult.the cost is around 2 times higher than clear glass.