Electron Microscope Tungsten Filaments/Cathodes
Electron Microscope Tungsten Filaments/Cathodes
Tungsten hairpin filaments are the standard type filaments widely used in Scanning Electron Microscopes, Transmission Electron Microscopes and Microprobe systems. Tungsten filaments are also called cathodes or electron emitters or electron sources. The high quality filaments we offer are made to the original equipment manufacturer's specifications using special tools to guarantee the correct shape for the filaments and to generate the optimum electron beam. The filaments are annealed i n vacuum, stress-free and precisely aligned before they are shipped. Please consult the list below for the correct type of filament for your SEM, TEM, or EPMA.
The tungsten filaments are manufactured from high grade tungsten. Of all metals in pure form, tungsten has the highest melting point (3422°C / 6192°F), the lowest vapor pressure at temperatures above 1650°C (3000°F) and has the highest tensile strength. Tungsten also has the lowest coefficient of thermal expansion of any pure metal. This combination of properties makes tungsten the ideal material.
| Instrument | New Filament # |
|---|---|
| AEI | 1403 |
| AMR / AMRAY (except AMRAY 1200 series) | 1421 |
| AMRAY 1200 (Siemens style) | ---- |
| Cambridge Instruments (except and S4-10) | 1403 |
| Cambridge Instruments S4-10 (Siemens style) | ---- |
| Cameca | ---- |
| CamScan standard Siemens style | ---- |
| CamScan with AEI conversion | 1403 |
| CamScan with new TESCAN column | 1427 |
| ETEC | 1406 |
| FEI / Philips | 1412 |
| Hitachi S-type | 1428 |
| Hitachi Filament in Cartridge for TM3030, TM3000 and TM1000 | 1434 |
| Hitachi HU-type | ---- |
| ISI / ABT / Topcon 2-pin | 1425 |
| ISI / ABT / Topcon 3-pin | 1426 |
| JEOL K-type type modern style | 1407 |
| Leica | 1403 |
| LEO 400 and 1400 Series | 1403 |
| LEO 1450 (except systems converted to AEI) | 1427 |
| MAC Probe | ---- |
| NORAN (ADAM) | ---- |
| Novascan (SEMCO) | 1403 |
| Philips V Loop (PSEM 500 and later, EM200 and later) | 1412 |
| RCA | ---- |
| TESCAN | 1427-1 |
| Siemens | ---- |
| ZEISS | 1427 |
| ZEISS EVO | 1403 |
Dimensions for EM Filament Bases (for Tungsten/Lab6) Filaments
| Base Type | Diameter of Ceramic disc in mm |
Diameter of Pins in mm |
Center Distance of Pins in mm |
|---|---|---|---|
| AEI | 12.0 | 1.0 | 6.45 |
| FEI/PHILIPS | 26.0 | 1.0 | 5.0 |
| JEOL K-type | 28.0 | 1.2 | 8.0 |
| HITACHI S-type | 9.8 | 1.2 | 2.7 |
| ZEISS (DSM & TEM) LEO (1450 & TEM) TESCAN |
19.8 | 1.0 | 5.0 |
| AMRAY (except 1200) | 26.1 | 1.0 | 5.0 |
| ISI/ABT/TOPCON 2 pins |
23.3 | 1.2 | 11.9 |
| ISI/ABT/TOPCON | 23.4 | 1.2 | 12.0 |
|
1403, -L,WRE |
AEI Base Filaments for ZEISS (EVO), LEO, AEI, Cambridge (except S4-10), Novascan, LeicaDiameter of ceramic disc: 12.0mm |
|
1412 |
FEI and Philips Standard V Loop FilamentsDiameter of ceramic disc: 26.0mm |
|
1407 |
JEOL K-type FilamentsCeramic in stainless steel alignment ring. |
|
1428 |
Hitachi S-type Filaments(newer H-, S- and X- series) |
|
1434 |
Hitachi Filament in Cartridge |
|
1427. 1427-1 |
ZEISS (DSM Series and TEM), LEO (TEM 900 Series), LEO (SEM 1450 Series), TESCAN FilamentsDiameter of ceramic disc: 19.8mm |
|
1421 |
AMRAY Filaments, except AMRAY 1200 SeriesDiameter of ceramic disc: 26.1mm |
|
1425 |
ISI / ABT / Topcon Filaments, 2-prong curved pinsDiameter of ceramic disc: 23.3mm |
|
1426 |
ISI / ABT / Topcon Filaments, 3-prongDiameter of ceramic disc: 23.4mm |
|
1406 |
ETEC0.004" and 0.005" tungsten wire thickness |
Documentation
Documentation
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