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Schott Nextrema® 724-8 Glass Ceramic

Category Ceramic , Glass , Glass Ceramic
Manufacturer Schott North America
Trade Name Nextrema®
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Schott Nextrema® 724-8 Glass Ceramic.pdf
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Material Notes:
The NEXTREMA® family of glass-ceramics combines the glossy appearance of glass with exceptional thermal, chemical, optical and mechanical properties such as:Very low coefficient of linear thermal expansionExcellent temperature and thermal shock resistanceHigh transmission in infrared range and unique visible light transmission profiles with different specific gradesExcellent chemical resistanceHigh mechanical strength technical data presented herein are typical averages.Manufacturer Data Sheet
Physical Properties Metric English Comments
Density 2.54 g/cc
0.0918 lb/in³
Porosity 0.000 %
0.000 %
ISO 9385
Mechanical Properties Metric English Comments
Knoop Microhardness 600
600
HK <sub>0.1 / 20</sub>; ISO 9385
Modulus of Elasticity 86.0 GPa
12500 ksi
ASTM C-1259
Flexural Strength 150 MPa
21800 psi
Bending s<sub>bB</sub>; DIN EN 1288, Part 5, R45
Poissons Ratio 0.260
0.260
ASTM C-1259
Thermal Properties Metric English Comments
CTE, linear 0.630 µm/m-°C

@Temperature 20.0 - 300 °C
 0.350 µin/in-°F

@Temperature 68.0 - 572 °F
1.34 µm/m-°C

@Temperature 300 - 700 °C
 0.744 µin/in-°F

@Temperature 572 - 1290 °F
Specific Heat Capacity 0.800 J/g-°C

@Temperature 20.0 - 100 °C
 0.191 BTU/lb-°F

@Temperature 68.0 - 212 °F
Thermal Conductivity 1.70 W/m-K

@Temperature 90.0 °C
 11.8 BTU-in/hr-ft²-°F

@Temperature 194 °F
 DIN 51936, ASTM E 1461-01
Maximum Service Temperature, Air 550 °C

@Time 1.80e+7 sec
 1020 °F

@Time 5000 hour
 Inhomogeneous Heating
600 °C

@Time 3600 sec
 1110 °F

@Time 1.00 hour
 Inhomogeneous Heating
850 °C

@Time 1.80e+7 sec
 1560 °F

@Time 5000 hour
 Homogeneous Heating
950 °C

@Time 3600 sec
 1740 °F

@Time 1.00 hour
 Homogeneous Heating
Optical Properties Metric English Comments
Transmission, Visible 0.000 %

@Thickness 4.00 mm,
Wavelength 400 nm
 0.000 %

@Thickness 0.157 in,
Wavelength 400 nm
5.00 %

@Thickness 4.00 mm,
Wavelength 600 nm
 5.00 %

@Thickness 0.157 in,
Wavelength 600 nm
10.0 %

@Thickness 4.00 mm,
Wavelength 700 nm
 10.0 %

@Thickness 0.157 in,
Wavelength 700 nm
IR Transmittance 17.0 %

@Thickness 4.00 mm,
Wavelength 1000 nm
 17.0 %

@Thickness 0.157 in,
Wavelength 1000 nm
46.0 %

@Thickness 4.00 mm,
Wavelength 1600 nm
 46.0 %

@Thickness 0.157 in,
Wavelength 1600 nm
70.0 %

@Thickness 4.00 mm,
Wavelength 2500 nm
 70.0 %

@Thickness 0.157 in,
Wavelength 2500 nm
UV Transmittance 0.000 %

@Thickness 4.00 mm
 0.000 %

@Thickness 0.157 in
Electrical Properties Metric English Comments
Volume Resistivity 400000 ohm-cm

@Temperature 350 °C
 400000 ohm-cm

@Temperature 662 °F
 DIN 52326
1.00e+7 ohm-cm

@Temperature 250 °C
 1.00e+7 ohm-cm

@Temperature 482 °F
 DIN 52326
Dielectric Constant 6.60

@Frequency 1.00e+6 Hz,
Temperature 25.0 °C
 6.60

@Frequency 1.00e+6 Hz,
Temperature 77.0 °F
Dielectric Loss Index 0.00200

@Frequency 1.00e+6 Hz,
Temperature 25.0 °C
 0.00200

@Frequency 1.00e+6 Hz,
Temperature 77.0 °F
Chemical Properties Metric English Comments
Acid Class, SR 1.00
1.00
DIN 12116
Alkali Class, AR 1.00
1.00
ISO 695
Descriptive Properties Value Comments
Appearance Opaque
Color White
Hydrolytic Resistance HGB 1
DIN ISO 719
tk100(°C) 197
specific electric volume resistivity of 10<sup>8</sup> O·cm
Thermal Shock Resistance (TSR) 700°C
Resists cold water without cracking
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