Pressure and Vacuum Sealed Feedthroughs from TC Ltd.
01895 252222 | info@spectite.co.uk

Series EFT High Voltage Electrode Feedthroughs (8kV) with PTFE Insulator

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The integral electrode mounted in these feedthroughs enables specifiers to pass voltages up to 8kV 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 four sizes of copper electrodes rated 40A, 100A and 200A at 8kV maximum. Stainless steel and nickel electrodes can also be specified.

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

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

PTFE is resistant to most known chemicals and oils.

  • Integral one piece PTFE insulator and sealant
  • Copper, stainless steel or nickel electrodes
  • Four sizes of feedthrough assembly
  • Rated maximum 8kV at up to 200A
  • Guide pressure range: Vacuum up to 150 bar
  • Temperature range: -185°C to +230°C
  • 316L Stainless steel body, 303 internal follower and cap; PTFE insulator
  • Electrodes pre-installed in feedthrough and torqued ready for installation
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 1 (1/8" Thread or equivalent) Size 2 (1/4" Thread or equivalent) Size 3 (1/2" Thread or equivalent)
Standard Thread Sizes Electrode Diameter Standard Thread Sizes Electrode Diameter Standard Thread Sizes Electrode Diameter
1/8" BSPT, 1/8" BSPP, 1/8" NPT 3.2mm 1/4" BSPT, 1/4" BSPP, 1/4" NPT 3.2mm 1/2" BSPT, 1/2" BSPP, 1/2" NPT 6.35mm
Alternative Thread Sizes Alternative Thread Sizes Alternative Thread Sizes
M8x1.0, 3/8" UNF-24 M10x1.0, 7/16" UNF-20 3/8" BSPT, 3/8" BSPP, 3/8" NPT
M10x1.0, 7/16" UNF-24 M12x1.5, 1/2" UNF-20 M14x1.5, 7/16" SAE-20, 9/16" UNF-18
  M16x1.5, 1/2" SAE-20, 5/8" UNF-18
M20x1.5, 9/16" SAE-24, 3/4" UNF-16
Size 4 (3/4" Thread or equivalent)  
Standard Thread Sizes Electrode Diameter
3/4" BSPT, 3/4" BSPP, 3/4" NPT 12.7mm
Alternative Thread Sizes
M22x1.5, 3/4" SAE-16, 7/8" UNF-14
M24x2.0, 7/8" SAE-14, 1" UNF-14
Style 'A' (Supplied as standard) Description Style 'B' (Alternative cap) Description

STANDARD
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:
EFT3 - 1/2" BSPT - CU - 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
Outside
Diameter
Thickness
KF FLANGE KF16 Size 2 30mm 5.08mm
KF25 Size 3 40mm 5.08mm
KF40 Size 5 55mm 5.08mm
KF50 Size 5 75mm 5.08mm
CF FLANGE DN16CF Size 3 33.8mm 7.6mm
DN25CF Size 4 54.0mm 11.9mm
DN35-40CF Size 5 69.9mm 12.7mm
DN50CF Size 5 85.7mm 16.0mm
DN63CF Size 5 114.3mm 17.3mm
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 Ltd. for details.

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

Body Size Size 1 (1/8") Size 2 (1/4") Size 3 (1/2") Size 4 (3/4")
Sealant PTFE PTFE PTFE PTFE
Voltage Rating 2Kv 8Kv 8Kv 8Kv
Electrode Material Electrode Current Rating Electrode dia. (mm) The table indicates the available electrode sizes for each feedthrough body size.
The maximum guide pressure value (in bar) at 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.
Copper
316 Stainless Steel
Nickel

40A
10A

15A

3.2 150      
Copper
316 Stainless Steel
Nickel
40A
10A
15A
3.2   80
Copper
316 Stainless Steel
Nickel
100A
15A
40A
6.35   80
Copper
316 Stainless Steel
Nickel
200A
30A
80A
12.7   40
  1. The guide pressures shown for each type of sealant are at 20°C. Spectite® feedthroughs from TC Ltd. 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 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 1 (1/8" Thread or equivalent) 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 with PTFE Insulator (8kV)

1. Feedthrough Body Size

2. Thread Size

3. Electrode Material

4. Cap Style

4a. B Cap Thread Size (other)

5. Optional Flange

6. 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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