Pressure and Vacuum Sealed Feedthroughs from TC
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Series EF High Voltage Electrode Feedthroughs (2kV)

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The integral electrode mounted in these feedthroughs enables specifiers to pass voltages up to 2kV in process enclosures, autoclaves, vacuum furnaces and reactor vessels to power heaters, electric motors and other devices needing high power supply.

Feedthroughs are available with three sizes of copper electrodes rated 40A, 100A and 200A at 2kV maximum. Stainless steel and nickel electrodes, that have a lower current rating than copper electrodes, can be specified instead of copper. These are often used when temperatures exceed 380°C.

Feedthroughs with copper electrodes have brass nuts and washers. Stainless steel nuts and washers are fitted to stainless steel and nickel electrodes.

Series EF sealed electrode assemblies are supplied pre-torqued for immediate installation. Integral insulators are made from ceramic.

  • Integral Ceramic insulators
  • Copper, stainless steel or nickel electrodes
  • Three sizes of feedthrough assembly
  • Rated for use at 2kV at up to 200A
  • Guide pressure range: Vacuum up to 600 bar
  • Choice of 3 sealant materials
  • Temperature range:
    -328°F to +715°F (copper electrode)
    -328°F to +1600°F (stainless steel electrode)
    -328°F to +1600°F (nickel electrode)
  • Maintainable - internal components replaceable
  • Electrodes pre-installed in feedthrough and torqued ready for installation
  • ATEX Approved versions to Ex II 2 GD, Ex d IIC Gb / Ex e IIC Gb, Ex ta IIIC Da available, please contact us for more details
Standard Body Style ('A' Cap) Threaded Extension ('B' Cap) Weld Neck Flanges
Standard body style suitable for most applications. Allows the gland to be terminated into the process as well as to a terminal head or conduit at the opposite end to the process. Supplied without thread for permanent installation into the process by welding.
Specify as 'WELD' for the thread size in the order code.
For termination to a mating flange within the process, see Optional Flanges for details of the flanges available as standard.
Size 2 (1/4" Thread or equivalent) Size 3 (1/2" Thread or equivalent) Size 4 (3/4" Thread or equivalent)
Standard Thread Sizes Electrode Diameter Standard Thread Sizes Electrode Diameter Standard Thread Sizes Electrode Diameter
1/4" NPT, 1/4" BSPT, 1/4" BSPP 0.125" 1/2" NPT, 1/2" BSPT, 1/2" BSPP 0.250" 3/4" NPT, 3/4" BSPT, 3/4" BSPP 0.500"
Alternative Thread Sizes Alternative Thread Sizes Alternative Thread Sizes
M10x1.0, 7/16" UNF-20 3/8" BSPT, 3/8" BSPP, 3/8" NPT M22x1.5, 3/4" SAE-16, 7/8" UNF-14
M12x1.5, 1/2" UNF-20 M14x1.5, 7/16" SAE-20, 9/16" UNF-18 M24x2.0, 7/8" SAE-14, 1" UNF-14
  M16x1.5, 1/2" SAE-20, 5/8" UNF-18  
M20x1.5, 9/16" SAE-24, 3/4" UNF-16
Sealant Material Code Colour Example Operating Temperature Range Re-usable Material definition and properties
Viton® V Brown -40°F to +435°F
(intermittently to 545°F)

Fluoroelastomer. Resists hydrocarbons, corrosive chemicals and petroleum. Solvent, acid and base resistant. Low permeation rate. Mechanically robust at high temperatures.

PTFE T White -328°F to +480°F Yes Polytetrafluoroethylene. FDA approved grade to Title 21-CFR 17. 1550 and is approved to US Pharmacopoeia Class VI. Has smooth, non-wetting, hydrophobic surfaces that resist biofilm buildup and the lowest coefficient of friction of any solid material. Low thermal transfer.
Lava L Grey Stone -328°F to +1600°F No

Natural Magnesium Silicate (Soapstone, Steatite or Rock Talc). Crushes to a powder when compressed. Hygroscopic. Porous to light gases. Unsuitable for use with liquid media and in most vacuum applications.

Other sealant materials may be specified, usually for the individual special requirements of particular applications. Please contact us for assistance.
Style 'A' (Supplied as standard) Description Style 'B' (Alternative cap) Description

Standard Fitting with single thread for direct mounting into process.

Standard Fitting with a Style B threaded extension for conduit/terminal head or enclosure connection. The thread form is the same as the process thread unless otherwise specified.

If a different thread form is required, please specify after the 'B' in the order code, for example:
EF3 - 1/2" BSPT - CU - L - B NPT

If a B cap is used with a weld neck fitting, then the thread form must be specified.

Style Example Part Code Maximum Compatible
Body Size
KF FLANGE KF16 Size 2 1.181" 0.200"
KF25 Size 3 1.575" 0.200"
KF40 Size 5 2.165" 0.200"
KF50 Size 5 2.953" 0.200"
CF FLANGE DN16CF Size 3 1.331" 0.299"
DN25CF Size 4 2.126" 0.469"
DN35-40CF Size 5 2.752" 0.500"
DN50CF Size 5 3.374" 0.630"
DN63CF Size 5 4.500" 0.681"
All flanges are supplied in 304L stainless steel as standard. Hygienic and Food Grade Flanges are also available - please contact us for further details.
CF Flanges are non-rotatable (fixed) type and comply with ISO3669-2017.
KF Flanges are compatible to the ISO Standard 2861 Specification.
Many other styles of flange available on request (DIN, JIS, ANSI, etc.), contact TC Inc. for details.

Body Size, Pressure Guide and available Bore Sizes for NPT Threads2

Body Size Size 2 (1/4") Size 3 (1/2") Size 4 (3/4")
Sealant L T V L T V L T V
Voltage Rating 2Kv 2Kv 2Kv
Electrode Material Electrode Current Rating Electrode dia. (inches) The table indicates the available electrode sizes for each feedthrough body size.
The maximum guide pressure value (in psi) at 68°F (20°C)is shown for each sealant material according to element size1.
These ratings are a guide and the suitability of any of the products described herein for a particular application is entirely at the discretion of the purchaser as being the best judge for that particular application.
316 Stainless Steel
0.125" 8700 5000 7900    
316 Stainless Steel
0.250"   6500 2100 5800
316 Stainless Steel
0.500"   2900 2100 2100
  1. The guide pressures shown for each type of sealant are at 68°F (20°C). Spectite® feedthroughs from TC Inc. have been designed to provide an efficient seal on the elements and restrain them from moving under pressure and vacuum. It is good installation practice to provide additional, mechanical restraint to the elements when differential pressure exceeds 50% of the feedthrough guide pressure value at 68°F (20°C). With an increase in temperature, a reduction in the maximum guide pressure value can be expected. These ratings are a guide and the suitability of any of the products described herein for a particular application is entirely at the discretion of the purchaser as being the best judge for that particular application.
  2. Other types of process connection are available, see Feedthrough Sizes.
Size 2 (1/4" Thread or equivalent) Size 3 (1/2" Thread or equivalent) Size 4 (3/4" Thread or equivalent)

Enquiry Form - High Voltage Electrode Feedthrough (2kV)

1. Feedthrough Body Size

2. Thread Size

3. Electrode Material

4. Sealant Material

5. Cap Style

5a. B Cap Thread Size (other)

6. Optional Flange

7. Quantity Required

Additional Information

If you are unsure about the specification of the fitting you require, please use the box below to tell us about your application and one of our experienced engineers will call you back to help guide you through the selection process.

Otherwise, please use the drop down boxes provided and we will arrange for a quotation to be sent to you.

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