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Feedthrough and sealed tube assemblies are specified for ordering by a simple composite description that includes the type of feedthrough, the size of the feedthrough body (defined by the size of the process connection), the size of the element(s) to pass through the feedthrough, the number of elements (not applicable to PF &
PSF for single elements), the sealant material, and the sealant material.
There are two types of cap. The more popular Type A cap with the internal mounting thread or the type B cap with an external mounting thread. The external mounting thread is always the same size as the process connection thread.
Order code arrangements for feedthroughs for multiple wires and with integral electrodes include additional parameters. Further details are given in the order code information for each series.
For assistance with specifying and ordering Spectite® feedthrough assemblies, particularly where there are high temperatures, high pressures or difficult application environments, contact Spectite Inc.
Replacement parts and thread lubricant
Sealants and other internal components for Spectite® feedthrough assemblies are available as replacement parts. To specify the component needed, prefix the order code of the feedthrough assembly for which the part is required by: RS for a replacement sealant; RP for a set of internal components, (i) for series MF feedthroughs comprising follower, sealant and seat, or (ii) for series WF feedthroughs comprising two internal insulators and sealant; RI for a pair of insulators for series EF feedthroughs; RE for a replacement electrode (with nuts and washers) for series EF.
A lubricant is applied to feedthrough bodies, followers and caps during assembly in our factory. It helps to prevent these component parts from binding and minimises friction between mating surfaces. Each time a feedthrough assembly is opened so that elements or sealants can be replaced or elements adjusted, re-application of lubricant is recommended. Speclube Lubricant is available from Spectite Inc. in handy 1/4 ounce bottles with applicator brushes.
Order as Speclube Thread Lubricant.
Feedthrough bodies can be specified with a choice of threaded process connections. Feedthroughs with the common tapered threadforms, NPT (National pipe tapered thread) to ANSI/ASME B1.20.1 and BSPT (Conical gas thread or ‘R’ thread) to BS21, DIN 2999 ISO 7/1 & JIS B0203 are generally stocked items.
Feedthroughs with parallel threaded process connections, SAE, BSPP and ISO metric to DIN13, may also be specified.
Feedthroughs with parallel mounting threads need an ‘O’ ring or a gasket seal (not supplied) to prevent leakage at the process connection.
Feedthroughs without process connection threads may be specified for welded mounting and with a fitted flange from a range of styles including ISO-KF and -CF types for the vacuum industry and general applications as well as Triclover® and triclamp types for the food and pharmaceutical industries.
Custom engineered assemblies can be designed and made to meet customers’ specific application requirements.
Plain, hexagonal caps are available for all sizes of feedthrough. Additionally, caps with a threaded extension for a conduit connection are also available. The following thread choices are available: NPT, BSPP (parallel gas thread) or BSPT (conical gas thread). These caps can be specified for feedthroughs with 1/4”, 1/2” & 3/4” process connections. Cap threads are the same size as the corresponding feedthrough body process connection.
Pressure Equipment Directive (PED)
Spectite® sealed feedthroughs have been classified as ‘Piping’, satisfying the requirements of the category of Sound
Engineering Practice (SEP), according to the European Pressure Equipment Directive (PED) 97/23/EC. The PED does
not require the ‘CE’ symbol to be identified on Pressure Equipment that is categorised as SEP. Caps are marked
SPECTITE on one of the hexagon faces.
Feedthrough component materials
Spectite feedthrough bodies, followers, seats and series EF SS electrodes are manufactured in an Austenitic stainless steel UNS S31603, commonly designated 316L. Equivalent grades are: (USA) AISI 316L; (UK) BS 316 S11; (Germany) W.-Nr. 1.4404, DIN CrNiMo 17.13.2; (France) AFNOR Z2 CND 17.12; (Italy) UNI X2 CrNiMo 17.12; (Sweden) SS2353; (Japan) JIS SUS 316L. The typical chemical composition for this steel is 0.03%C, 16.0-18.0%Cr, 10-14%Ni, 2.0-3.0%Mo, 0.10%N. Caps are manufactured in stainless steel UNS S30300 (AISI 303).
When 316L is unsuitable for an application, the ‘wetted’ metal parts of feedthroughs, that come into contact with a process, can be manufactured in other stainless grades or other materials such as Hastelloy® and Inconel® grades, Monel® R- 405 or mild (carbon) steel. There may be minimum manufacturing requirements for feedthroughs in ‘exotic’ materials.
Insulators in series WF feedthroughs with 1/8” process connections and in series EF feedthroughs are manufactured in high-purity recrystallised Alumina (Aluminium Oxide Al2O3). External, single-bore insulators in series WF feedthroughs are manufactured in aluminous porcelain. Internal insulators are manufactured in a high-performance, engineering plastic for use at temperatures up to +450°F (+230°C) or machineable glass ceramic for use up to +1,600°F (+870°C).
Electrical conductors for Series EF feedthroughs are made in grade C101 copper or 316L stainless steel (as above). Nuts and washers on copper conductors are brass, stainless steel conductors have stainless steel nuts and washers.
The Speclube lubricant used on feedthrough components is Chlorotrifluoroethylene Polymer (PCTFE). A copy of the Safety
Data Sheet is available on request. Spectite® feedthroughs should not be degreased before installation.
Kapton® is a registered trademark of E.I. du Pont de Nemours and Company
Viton® is a registered trademark of DuPont Performance Elastomers
Hastelloy®is a registered trademark of Haynes International, Inc.
Inconel® and Monel® are registered trademarks of the Special Metals Corporation group of companies
Triclover® is a registered trademark of Alfa-Laval AB
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Spectite Inc., PO Box 917, Hillside, IL60162, USA
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