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Resistor Ceramics
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Resistor Ceramics
Long experience in extrusion forming process with various kind materials realizes the supply of high quality product for resistor application.
Surface polishing or treatment, etc. are available upon request.

Specifications
Material Alumina Corundum-mullite
Product code number A-98 A-3 A-85 A-80 N-12 NK-3
Chemical analysis Al2O3
98%
Al2O3
93%
Al2O3
85%
Al2O3
80%
Al2O3-3Al2O3
*2SiO2
Color White White White White White White
Apparent specific gravity [kg/m3] 3.8 x103 3.7 x103 3.5 x103 3.4 x103 2.8 x103 3.1 x103
Water absorption [%] <0.01 <0.01 <0.01 <0.01 <0.01 <0.01
Safety service temperature [℃] 1,500 1,500 1,200 1,100 1,100 1,100
Flexural strength [MPa] 340 290 260 190 130 170
Compressive strength [MPa] 1700 980 980 980 630 680
Thermal expansion 20 to 500℃ 7.1 x10-6 7.1 x10-6 6.8 x10-6 6.6 x10-6 5.1 x10-6 5.9 x10-6
20 to 800℃ 7.8 x10-6 7.8 x10-6 7.5 x10-6 7.4 x10-6 5.9 x10-6 6.7 x10-6
20 to 1000℃ 8.0 x10-6 8.0 x10-6 7.9 x10-6 7.8 x10-6 6.3 x10-6 7.1 x10-6
Thermal conductivity [W/(m・K)] 20 16 9.2 6.2 2.5 4.1
Dielectric strength [kV/mm] 15 10 10 10 10 10
Volume resistivity
[ohm-cm]
25℃ >1014 >1014 >1014 >1014 >1014 >1014
300℃ >1010 1011 1011 1011 >1010 >1010
500℃ 108 108 108 108 108 108
Dielectric constant (1MHz) 9.5 9.0 9.5 8.0 6.5 7.5
Loss factor (1MHz) 0.0003 0.0001 0.0001 >0.01 0.002 >0.01

Standard diemnsion and shape
Material Alumina Corundum-mullite
Product code number A-98 A-3 A-85 A-80 N-12 NK-3
Chemical analysis Al2O3
98%
Al2O3
93%
Al2O3
85%
Al2O3
80%
Al2O3-3Al2O3*2SiO2
Dimension
Outer Diameter
(x Inner Diameter)
x Length (mm)
0.6(x0.2)x2
0.4(x0.2)x2 etc
1x3.1, 1.3x2.7, 1.7x5.2 or 5.5, 2 or 2.5x8, 3 or 3.5x10 or 11,
4 or 4.5x14, 7x23 or 51
However A-3 products are under 4.5mm about diameter.
Standard shape Pipe Column (Pipe is also availabe.)


Inquiry

Sales and Business Control Group
Phone +81-561-48-5012, FAX +81-561-48-5058
E-MAIL info@phononmeiwa.co.jp


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