Resistor coresWe supply ceramic cores for resistors and other electrical components. It is also possible to manufacture ceramic cores to your
own drawings.
Please find a list of our standard cores below (status October 01 2011):
Ser. No. |
Product No. |
External dimensions of product |
Fig. |
Length L mm |
Diameter D mm |
Radius R mm |
1 |
CR13 |
1.3±0.02 |
2.7±0.08 |
0,25~0,35 |
|
2 |
CR17 |
1.7±0.03 |
5.2±0.1 |
0,35~0,45 |
3 |
CR232 |
2.32+0.015 |
6.2-0.3 |
0,35~0,55 |
4 |
CR3 |
3±0.03 |
8±0.15 |
0,40~0,70 |
5 |
CR35 |
3.5±0.04 |
10±0.20 |
0,40~0,70 |
|
6 |
CR4 |
4±0.05 |
14±0.3 |
0,50~0,80 |
7 |
CR54 |
5.4+0.06 |
11.8-0.5 |
0,50~0,81 |
8 |
CR74 |
7.4+0.065 |
17-0.6 |
0,60~1,00 |
We can supply a choice of two types of material with Al2O3 contents of at least 68% and 95% respectively. The properties of the materials are specified in the following list:
Parameters of material with an Al2O3 content of at least 68%:
Ser. No.
|
Designation of property
|
Value of property
|
1
|
Minimum density, g/cm3
|
3.1
|
2
|
Maximum water absorption in %
|
0.01
|
3
|
Minimum bending strength sи МPа
|
170
|
4
|
Mean linear coefficient of thermal expansion at temperatures of 20°C to 800°С
|
6.7x10-6
|
5
|
Thermal conductivity W·m-1·К-1 at temperatures of 20°C to 100°С
|
4,1
|
6
|
Minimum dielectric strength kV·mm-1 at frequency of 50 Hz
|
10
|
7
|
Minimum specific volume resistivity at a temperature of 20°С
|
1014
|
8
|
Relative permittivity at frequency of 1 МHz
|
7.5
|
9
|
Maximum dielectric loss factor at frequency of 1MHz
|
>0.01
|
10
|
Surface finish of manufactured products Ra
|
0.5
|
Properties of material with 95% Al2O3 content:
Ser. No.
|
Designation of property
|
Value of property
|
1
|
Minimum density, g/cm3
|
3.6
|
2
|
Maximum water absorption in %
|
0.01
|
3
|
Minimum bending strength sи МPа
|
300
|
4
|
Mean linear coefficient of thermal expansion at temperatures of 20°C to 800°С
|
8x10-6
|
5
|
Thermal conductivity W·m-1·К-1 at temperatures of 20°C to 100°С
|
25
|
6
|
Minimum dielectric strength kV·mm-1 at frequency of 50 Hz
|
15
|
7
|
Minimum specific volume resistivity at a temperature of 20°С
|
>1012
|
8
|
Relative permittivity at frequency of 1 МHz
|
9.,5
|
9
|
Maximum dielectric loss factor at frequency of 50 Hz
|
0.5
|
10
|
Surface finish of manufactured products Ra
|
0.4
|
|