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Neoceram®
DESCRIPTION
| Neoceram® is a glass product that offers continuous, high temperature use (700° C / 1292° F) with no fear of destruction from high heat or temperature variation (water or snow on hot glass). |
PROPERTIES
Color: TRANSPARENT
| Thermal: |
Thermal expansion coefficient
|
x 10-7/°C
|
-50 ~ 0°C
|
-8.5 |
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0 ~ 50°C
|
-6.5 | |||
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30 ~ 380°C
|
-6.0 | |||
|
30 ~ 750°C
|
-3.0 | |||
| Specific heat |
cal/g•°C
|
25°C
|
0.17 | |
| Thermal conductivity |
Kcal/m-hr-°C
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25°C
|
1.3 | |
| Max. service temp. |
°C
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Continuous
|
700* | |
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Short term
|
800* | |||
| Thermal shock resistance** |
°C
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100 x 100 x 3 mm Plate
|
800 |
| Optical: | Index of refraction (nd) |
1.541
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| ABBE number (νd) |
57
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| Stress-optical coefficient | mμ/cm/kg/cm2 | 25°C |
3.0
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| Mechanical: | Density |
g/cm3
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2.51
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| Bending Strength |
kgf/cm2
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JIS R-1601
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1400
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Vicker's Hardness
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Hv (0.2)
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700
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| Knoop Hardness |
Hk (0.2)
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500
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| Young's Modulus |
x 103 kgf/cm2
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0.9
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Chemical:
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Acid Resistance
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(5% HCl)
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mg/cm2
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90°C
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24 hrs.
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0.1
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Alkali Resistance
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(5%Na2CO3)
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mg/cm2
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90°C
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24 hrs.
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0.3
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Water Resistance ***
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(H2SO4)
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ml
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0.19 | |||
| Electrical: | Volume resistivity (Log ρ) |
Ω-cm
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25°C
|
11.4
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250°C
|
6.4
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360°C
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5.3
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| Dielectric Constant (ε) |
1 MHz, 25°C
|
7.5
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2.45 GHz, 25°C
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-
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| Loss Tangent (tan δ) |
x 10-3
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1 MHz, 25°C
|
22
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2.45 GHz, 25°C
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-
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| Loss Factor |
x 10-2
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1 MHz, 25°C
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167
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2.45 GHz, 25°C
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-
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| * Maximum service temperature: Determination of the maximum service temperature is based on mechanical information, and is the temperature of which 100 x 300 x 3.8τ mm plate specimens (supported to form a 280-mm span) deform by 1 mm after 1,000 hours continuous or 24 hours of short term heating. |
| ** These figures are only general values derived by a procedure consisting of heated specimens which are then rapidly cooled by plunging them into water. Thermal shock properties of 100°C signify that specimens have been heated to 110°C and plunged into water at 10°C without exhibiting cracking. |
| *** 10g of specimen (grain size: 300 to 425 microns) is immersed in 50cc of water in an autoclave of 121°C for 30 minutes, then the test solution is titrated by 0.02N H2SO4 (ASTM). |