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Ishizuka Glass CRYSTERNA |
CRYSTERNA, a High-Strengthened glass
 Marubeni is proud to introduce high-strenghtened glass by it's manufacturing partner, Ishizuka Glass Co. CRYSTERNA is a special glass with a compressed stress layer that enables superior durability to the surface of the substrate.
Glass easily breaks or scratches when a strong force is physically applied to it; it has an inherent characteristic of having a weak tensile strength. By adding compressed stress to its surface, high-strengthened glass CRYSTERNA can withstand an amount of force that does not exceed the compressed stress that is intentionally added to it.
CRYSTERNA is strengthened through chemical tempering. Ishizuka uses an ion exchanging method for the chemical tempering of its glass products. This method allows the glass surface to maintain a slightly compressed stress layer by exchanging sodium ions (Na+) in the glass surface layer with potassium ions (K+) through thermally assisted chemical tempering, thus greatly enhancing the strength of the glass.
Developed for applications that require glass with superior strength, Ishizuka boasts a top market share of glass used in watch coverglass applications in the Japanese market. CRYSTERNA is presently used in watch coverglass as well as other applications not only in Japan but around the world. |
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| Features |
With a strength greater than sapphire, CRYSTERNA can be used in applications where thin glass is desirable.
As deep compressed stress layer on the surface of the glass obtained, at the time of ion exchange, the hardness of CRYSTERNA is superior than other glass.
CRYSTERNA maintains an excellent strength performance based on a wide range of strenghtening treatments.
The mechanical processability is the same as common glass and therefore there there are no associated cost premiums.
Chemical Tampering
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Characteristics of "CRYSTERNA"
| Specific gravity |
2.51 |
g/cm3 |
JIS C 2141 |
| Chemical durability |
0.28 |
Na2Omg |
ASTM C 225 |
| Refractive
index |
1.52 |
nD |
JIS K 7105 |
Thermal
properties |
Strain point |
511 |
ºC. |
JIS R 3103 |
| Softening point |
708 |
ºC. |
JIS R 3103 |
| Expansion (a) |
8.7 |
×10-6/C |
JIS C 2141 |
Mechanical
properties |
Bending strength |
863 |
MPa |
JIS C 2141 |
| Vickers hardness (Hv) |
640 |
300g,15sec |
JIS C 2141 |
| Young's modulus |
7 × 104 |
MPa |
JIS R 3103 |
| Surface compression |
588 to 980 |
MPa |
Measured by"FSM-60"
(TOSHIBA CORPORATION) |
| Surface compression layer |
20 |
µm |
Sample
Static Pressure Strength
Impact Strength (Drop Strength)
Comparison with among material
| Materials |
CRYSTERNA |
White
sheet glass |
Blue
sheet glass |
Sapphire |
| Characteristics |
Bending
strength
(MPa) |
863 |
637 |
618 |
686 |
Vickers hardness (Hv)
300g 15sec |
640 |
570 |
570 |
1200 |
Surface compression
(MPa) |
785 |
588 |
549 |
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| Surface compression layer µm |
20 |
10 |
13 |
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Product specification
| Article No. |
Plate
thickness (mm) |
Plate
length (mm) |
Plate
width (mm) |
Number of
Plate/case |
| IG315 |
1.5 ± 0.2 |
500 ± 20 |
160 ± 15 |
70 |
| IG323 |
2.3 ± 0.2 |
160 ± 15 |
45 |
| IG328 |
2.8 ± 0.2 |
150 ± 15 |
40 |
| IG335 |
3.5 ± 0.2 |
140 ± 15 |
35 |
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| Application |
- Cover glass for Watches
- Cover glass for Cell phones
- Cover glass for Digital camera (lens and display)
- Cover glass for small displays (GPS, Radio, etc)
- Cover glass for other applications
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| Contact
Address |
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For more information on CRYSTERNA High-Strengthened Glass by Ishizuka, please contact Marubeni Sunnyvale and we will send you a full brochure and information packet.
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